River flood prediction method

Abstract

To provide a river flood prediction method for predicting river floods.SOLUTION: Instead of the conventional river flood prediction method, the river flood prediction method of the present invention includes: a preparing step of preparing a data set; and a flooded location identification step of determining the existence of river flood due to rainfall or the margin time until river flooding based on real-time observation images of the river, identifying from the determined result a river flood location of the bank where the river water overflows from upstream to downstream of the river, and repeatedly executing the flooded location identification step during rainfall.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a river flood prediction method for predicting river floods.

Background Art

[0002] During rainfall, river floods may occur. River floods may cause property damage and endanger human bodies.

[0003] In a river flowing over a wide area, when rainfall continues upstream of the river, a flood occurs downstream of the river. When a river flood is detected downstream of the river, there may be insufficient time for evacuation. When there is rainfall, there is a need for a method to predict, detect, and notify of floods as soon as possible.

[0004] The inventors considered a method of monitoring a wide area of the river during rainfall, identifying overflow locations, identifying inundation areas, and notifying the necessary people of the inundation as soon as possible.

Summary of the Invention

Problems to be Solved by the Invention

[0005] In view of the above requirements, the present invention aims to provide a river flood prediction method for predicting river floods.

Means for Solving the Problems

[0006] To achieve the above object, a river flood prediction method for predicting floods in a wide area where a river flows during rainfall according to the present invention includes a preparation step of preparation, and a step of determining the presence or absence of a river flood due to rainfall based on real-time observation images of the river, and identifying an overflow location which is a location where the river water overflows the riverbank between the upstream and downstream of the river, and the overflow location identification step is repeatedly executed during rainfall.

[0007] In the configuration of the present invention, it is prepared in the preparation step. In the overflow location identification step, based on the real-time observation video of the river, it is determined whether there is a flood in the river due to rainfall, and the overflow location where the river water overflows the levee between the upstream and downstream of the river is identified. The overflow location identification step is repeatedly executed during rainfall. As a result, it is possible to predict the flood in real time and identify the flooded area.

[0008] Hereinafter, a river flood prediction method according to an embodiment of the present invention will be described. The present invention includes any one of the embodiments described below, or a combination of two or more of them.

[0009] In the river flood prediction method according to the embodiment of the present invention, in the overflow location identification step, the relative relationship between the levees provided on both banks of the river and the water edges on both sides of the river read from the real-time observation video of the river is evaluated at each of a plurality of positions between the upstream and downstream of the river. Based on the relative relationship between the upstream and downstream of the river and the real-time rainfall amount in the area near the river, the remaining time until the river floods at a plurality of positions between the upstream and downstream of the river is calculated, and the overflow location is identified based on the calculated remaining time. In the configuration of the above embodiment, in the overflow location identification step, the relative relationship between the levees provided on both banks of the river and the water edges on both sides of the river read from the real-time observation video of the river is evaluated at each of a plurality of positions between the upstream and downstream of the river. Based on the relative relationship between the upstream and downstream of the river and the real-time rainfall amount in the area near the river, the remaining time until the river floods at a plurality of positions between the upstream and downstream of the river is calculated, and the overflow location is identified based on the calculated remaining time. In the present invention, the relative relationship between the position of the levee and the position of the water edge is specified at the same position in the river length direction. As a result, it is possible to identify the overflow location between the upstream and downstream of the river in real time.

[0010] The river flood prediction method according to an embodiment of the present invention includes a preparation step of preparing a dataset that records the correspondence between a plurality of relative relationship / rainfall combinations, which are combinations of the relative relationship between the levees provided on both banks of the river and the water edges on both sides of the river and a plurality of rainfall amounts at each of a plurality of positions from the upstream to the downstream of the river, and a plurality of remaining times, which are the times from now until the river floods when the rainfall is continuous, and an overflow location specifying step of evaluating the relative relationship between the levees provided on both banks of the river and the water edges on both sides of the river read from the real-time observation video of the river at each of a plurality of positions from the upstream to the downstream of the river, calculating the remaining time, which is the time from now until the river floods at a plurality of positions from the upstream to the downstream of the river, based on the relative relationship from the upstream to the downstream of the river and the real-time rainfall amount in the area near the river, with reference to the dataset prepared in advance, and specifying the overflow location based on the calculated remaining time. In the configuration of the above embodiment, in the preparation step, a dataset is prepared that records the correspondence between a plurality of relative relationship / rainfall combinations, which are combinations of the relative relationship between the levees provided on both banks of the river and the water edges on both sides of the river and a plurality of rainfall amounts at each of a plurality of positions from the upstream to the downstream of the river, and a plurality of remaining times, which are the times from now until the river floods when the rainfall is continuous. In the overflow location specifying step, the relative relationship between the levees provided on both banks of the river and the water edges on both sides of the river read from the real-time observation video of the river at each of a plurality of positions from the upstream to the downstream of the river is evaluated, and the remaining time, which is the time from now until the river floods at a plurality of positions from the upstream to the downstream of the river, is calculated based on the relative relationship from the upstream to the downstream of the river and the real-time rainfall amount in the area near the river, with reference to the dataset prepared in advance, and the overflow location is specified based on the calculated remaining time. As a result, the overflow locations from the upstream to the downstream of the river can be calculated in real time.

[0011] The river flood prediction method according to an embodiment of the present invention determines that there is a flood in the river when the shortest margin time from the upstream to the downstream of the river is shorter than a preset time, and identifies the location of the levee at the position with the shortest margin time from the upstream to the downstream of the river as the overflow location. In the configuration of the above embodiment, it is determined that there is a flood in the river when the shortest margin time from the upstream to the downstream of the river is shorter than a preset time, and the location of the levee at the position with the shortest margin time from the upstream to the downstream of the river is identified as the overflow location. As a result, the overflow location can be identified in real time from the upstream to the downstream of the river.

[0012] The river flood prediction method according to an embodiment of the present invention further includes a flooding notification step of notifying that there is flooding in the telecommunication equipment, and the flooding notification step notifies that there is flooding in the telecommunication equipment and the flooding time which is the margin time or the current time plus the margin time. In the configuration of the above embodiment, in the flooding notification step, it is notified that there is flooding in the telecommunication equipment and the time obtained by adding the margin time to the margin time or the current time is the flooding time when the river floods. As a result, it is possible to notify the necessary people in real time that there is flooding and the time thereof.

[0013] The river flood prediction method according to an embodiment of the present invention is such that the observed video is a video acquired using an artificial satellite. In the configuration of the above embodiment, the observed video is a video acquired using an artificial satellite. As a result, it is possible to predict a wide-area flood in real time and identify the overflow location.

[0014] The river flood prediction method according to an embodiment of the present invention further includes a flooded area specifying step of specifying a flooded area, which is an area flooded by water overflowing from the overflow location specified in the overflow location specifying step, and a flooding notification step of notifying that flooding has occurred. In the preparation step, an arbitrary position is associated with an electric communication device in advance. In the flooding notification step, the electric communication device associated with a position included in the flooded area is notified that flooding has occurred. During rainfall, the overflow location specifying step is repeatedly executed. When it is determined in the overflow location specifying step that there is a flood in the river due to rainfall, the flooded area specifying step is executed. In the configuration of the above embodiment, a flooded area, which is an area flooded by water overflowing from the overflow location specified in the overflow location specifying step, is specified based on the overflow location. In the preparation step, an arbitrary position is associated with an electric communication device in advance. In the flooding notification step, the electric communication device associated with a position included in the flooded area is notified that flooding has occurred. During rainfall, the overflow location specifying step is repeatedly executed. When it is determined in the overflow location specifying step that there is a flood in the river due to rainfall, the flooded area specifying step is executed. As a result, it is possible to accurately notify a person who wishes to be notified of the occurrence of flooding in real time.

[0015] In the river flood prediction method according to an embodiment of the present invention, in the preparation step, a plurality of hazard maps, which are map data depicting a flooded area expected when a specific location of a pair of levees provided on both banks of the river from the upstream to the downstream of the river in advance becomes the overflow location, are associated with a plurality of the specific locations of the levees and prepared. In the flooded area specifying step, the flooded area is specified based on the hazard map associated with the specific location of the levee that has become the specified overflow location. In the configuration of the above embodiment, in the preparation step, a plurality of hazard maps, which are map data depicting a flooded area expected when a specific location of a pair of levees provided on both banks of the river from the upstream to the downstream of the river in advance becomes the overflow location, are associated with a plurality of the specific locations of the levees and prepared. In the flooded area specifying step, the flooded area is specified based on the hazard map associated with the specific location of the levee that has become the specified overflow location. As a result, the flooded area can be accurately identified in real time.

[0016] The river flood prediction method according to an embodiment of the present invention is such that in the preparation step, a plurality of hazard maps which are map data depicting flooded areas expected when a specific location of a pair of levees provided on both banks of a river from upstream to downstream in a region where the river flows becomes the overflow location when rainfall is continuous in the region where the river flows are prepared in association with a plurality of rainfall amounts / specific levee location combinations which are combinations of a plurality of such rainfall amounts and a plurality of the specific levee locations, and in the flooded area identification step, the flooded area is identified based on the hazard map associated with the rainfall amount / specific levee location combination which is a combination of the real-time rainfall amount in the region where the river flows and the specific levee location which has become the overflow location. In the configuration of the above embodiment, in the preparation step, a plurality of hazard maps which are map data depicting flooded areas expected when a specific location of a pair of levees provided on both banks of a river from upstream to downstream in a region where the river flows becomes the overflow location when rainfall is continuous in the region where the river flows are prepared in association with a plurality of rainfall amounts / specific levee location combinations which are combinations of a plurality of such rainfall amounts and a plurality of the specific levee locations. In the flooded area identification step, the flooded area is identified based on the hazard map associated with the rainfall amount / specific levee location combination which is a combination of the real-time rainfall amount in the region where the river flows and the specific levee location which has become the overflow location. As a result, the flooded area when rainfall is continuous can be accurately identified.

[0017] The river flood prediction method according to an embodiment of the present invention is such that in the preparation step, map data in which a plurality of hazard maps depicting an inundation area expected when a specific location of a pair of levees provided on both banks of a river from upstream to downstream becomes the overflow location and the inundation height at an arbitrary position included in the inundation area are prepared in association with a plurality of rainfall amounts in the vicinity of the river in advance and a plurality of rainfall amount / levee specific location combinations which are combinations of the plurality of rainfall amounts and the plurality of specific locations of the levees. In the inundation area specifying step, the inundation area and the inundation height are specified based on the hazard map associated with the rainfall amount / levee specific location combination which is a combination of the real-time rainfall amount in the area where the river flows and the specified levee specific location that has become the overflow location. In the configuration of the above embodiment, in the preparation step, map data in which a plurality of hazard maps depicting an inundation area expected when a specific location of a pair of levees provided on both banks of a river from upstream to downstream becomes the overflow location and the inundation height at an arbitrary position included in the inundation area are prepared in association with a plurality of rainfall amounts in the vicinity of the river in advance and a plurality of rainfall amount / levee specific location combinations which are combinations of the plurality of rainfall amounts and the plurality of specific locations of the levees. In the inundation area specifying step, the inundation area and the inundation height are specified based on the hazard map associated with the rainfall amount / levee specific location combination which is a combination of the real-time rainfall amount in the area where the river flows and the specified levee specific location that has become the overflow location. As a result, the inundation area and the inundation height when the rainfall is continuous can be accurately specified.

[0018] The river flood prediction method according to an embodiment of the present invention further includes an inundation notification step of notifying that inundation has occurred. In the preparation step, an arbitrary position is associated with a telecommunication device in advance. In the inundation notification step, the telecommunication device associated with the position included in the inundation area is notified of the occurrence of inundation and the inundation height at an arbitrary position associated with the telecommunication device, which is the arbitrary position inundation height. During rainfall, the overflow location specifying step is repeatedly executed. When it is determined in the overflow location specifying step that there is a flood in the river due to rainfall, the inundation area specifying step and the inundation notification step are executed. The configuration of the above-described embodiment includes a flooding notification step, in which the presence of flooding is notified. In the preparation step, an arbitrary position is associated with an electric communication device in advance. In the flooding notification step, the electric communication device associated with the position included in the flooding area is notified of the presence of flooding and the arbitrary position flooding height, which is the flooding height at an arbitrary position associated with the electric communication device. During rainfall, the overflow location specifying step is repeatedly executed, and when it is determined in the overflow location specifying step that there is a flood in the river due to rainfall, the flooding area specifying step and the flooding notification step are executed. As a result, it is possible to accurately notify the necessary persons of the flooding area and the flooding height when the rainfall is continuous.

[0019] In the river flood prediction method according to the embodiment of the present invention, in the overflow location specifying step, based on the relative relationship between the position of at least one of a pair of levees provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river and the position of the water edge on the same side as the position of one of the pair of water edges of the river read from the real-time observation video of the river, the presence or absence of a flood in the river is determined to specify the overflow location. In the configuration of the above-described embodiment, in the overflow location specifying step, based on the relative relationship between the position of at least one of a pair of levees provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river and the position of the water edge on the same side as the position of one of the pair of water edges of the river read from the real-time observation video of the river, the presence or absence of a flood in the river is determined to specify the overflow location. As a result, it is possible to specify the overflow location from the upstream to the downstream of the river in real time.

[0020] The river flood prediction method according to an embodiment of the present invention is such that in the overflow location identification step, when the relative relationship between the position of at least one of a pair of levees provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river and the position of the water edge on the same side as the position of one of the pair of water edges of the river read from the real-time observation video of the river becomes a predetermined relative relationship, it is determined that there is a river flood, and the location of the levee at the position where the relative relationship between the position of the levee and the position of the water edge from the upstream to the downstream of the river becomes the predetermined relative relationship is identified as the overflow location. In the configuration of the above embodiment, in the overflow location identification step, when the relative relationship between the position of at least one of a pair of levees provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river and the position of the water edge on the same side as the position of one of the pair of water edges of the river read from the real-time observation video of the river becomes a predetermined relative relationship, it is determined that there is a river flood, and the location of the levee at the position where the relative relationship between the position of the levee and the position of the water edge from the upstream to the downstream of the river becomes the predetermined relative relationship is identified as the overflow location. As a result, the overflow locations from the upstream to the downstream of the river can be identified in real time.

[0021] The river flood prediction method according to an embodiment of the present invention is such that in the overflow location identification step, when the position of the water edge on the same side as the position of at least one of a pair of levees provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river and the position of one of the pair of water edges of the river read from the real-time observation video of the river coincide, it is determined that there is a river flood, and the location of the levee at the position where the position of one of the levees and the position of one of the water edges coincide from the upstream to the downstream of the river is identified as the overflow location. In the configuration of the above-described embodiment, in the overflow location specifying step, when the position of at least one of a pair of levees provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river coincides with the position of the waterside on the same side as the position of one of the pair of watersides of the river read from the real-time observation video of the river, it is determined that there is a river flood, and the location of the levee where the position of one of the levees and the position of one of the watersides coincide between the upstream and the downstream of the river is specified as the overflow location. As a result, it is possible to specify in real time the overflow locations between the upstream and the downstream of the river.

[0022] In the river flood prediction method according to an embodiment of the present invention, in the overflow location specifying step, based on the relative relationship between the levee width distance, which is the width distance of a pair of levees provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river, and the waterside width distance, which is the width distance of a pair of watersides of the river read from the real-time observation video of the river, it is determined whether there is a river flood, and the overflow location is specified. In the configuration of the above-described embodiment, in the overflow location specifying step, based on the relative relationship between the levee width distance, which is the width distance of a pair of levees provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river, and the waterside width distance, which is the width distance of a pair of watersides of the river read from the real-time observation video of the river, it is determined whether there is a river flood, and the overflow location is specified. As a result, it is possible to specify in real time the overflow locations between the upstream and the downstream of the river.

[0023] In the river flood prediction method according to an embodiment of the present invention, in the overflow location specifying step, when the relative relationship between the levee width distance, which is the width distance of a pair of levees provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river, and the waterside width distance, which is the width distance of a pair of watersides of the river read from the real-time observation video of the river, becomes a predetermined relative relationship, it is determined that there is a river flood, and the location of the levee where the relative relationship between the levee width distance and the waterside width distance between the upstream and the downstream of the river becomes the predetermined relative relationship is specified as the overflow location. In the configuration of the above-described embodiment, in the overflow location identification step, when the relative relationship between the bank width distance, which is the width distance between a pair of levees provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river, and the water-edge width distance, which is the width distance of a pair of water edges of the river read from the real-time observation video of the river, becomes a predetermined relative relationship, it is determined that there is a river flood, and the location of the levee where the relative relationship between the bank width distance and the water-edge width distance from the upstream to the downstream of the river becomes the predetermined relative relationship is identified as the overflow location. As a result, it is possible to identify in real time the overflow locations from the upstream to the downstream of the river.

[0024] In the river flood prediction method according to the embodiment of the present invention, in the overflow location identification step, when the bank width distance, which is the width distance between a pair of levees provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river, and the water-edge width distance, which is the width distance of a pair of water edges of the river read from the real-time observation video of the river, match, it is determined that there is a river flood, and the location of the levee where the bank width distance and the water-edge width distance match from the upstream to the downstream of the river is identified as the overflow location. In the configuration of the above-described embodiment, in the overflow location identification step, when the bank width distance, which is the width distance between a pair of levees provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river, and the water-edge width distance, which is the width distance of a pair of water edges of the river read from the real-time observation video of the river, match, it is determined that there is a river flood, and the location of the levee where the bank width distance and the water-edge width distance match from the upstream to the downstream of the river is identified as the overflow location. As a result, it is possible to identify in real time the overflow locations from the upstream to the downstream of the river.

[0025] The river flood prediction method according to an embodiment of the present invention calculates a margin horizontal distance, which is the horizontal distance between the position of at least one of a pair of levees provided on both banks of a river at each of a plurality of positions from the upstream to the downstream of the river and the position of the water's edge on the same side as the position of one of the pair of water's edges read from the real-time observation video of the river. Based on the margin horizontal distance between the upstream and the downstream of the river and the real-time rainfall in the area near the river, a margin time, which is the time from now until the river floods at a plurality of positions from the upstream to the downstream of the river, is calculated. The overflow location is specified based on the calculated margin time. In the configuration of the above embodiment, in the overflow location specifying step, a margin horizontal distance, which is the horizontal distance between the position of at least one of a pair of levees provided on both banks of a river at each of a plurality of positions from the upstream to the downstream of the river and the position of the water's edge on the same side as the position of one of the pair of water's edges read from the real-time observation video of the river, is calculated. Based on the margin horizontal distance between the upstream and the downstream of the river and the real-time rainfall in the area near the river, a margin time, which is the time from now until the river floods at a plurality of positions from the upstream to the downstream of the river, is calculated. The overflow location is specified based on the calculated margin time. As a result, the overflow location between the upstream and the downstream of the river can be calculated in real time.

[0026] The river flood prediction method according to an embodiment of the present invention is such that, in the preparation step, a data set is prepared that records the correspondence relationship between a plurality of margin horizontal distances / rainfall amount combinations, which are combinations of a plurality of margin horizontal distances that are the horizontal distances between the position of at least one of a pair of levees provided on both banks of a river at each of a plurality of positions from the upstream to the downstream of the river and the position of the water edge on the same side as the position of one of the pair of water edges of the river, and a plurality of rainfall amounts, and a plurality of margin times that are the times from now until the river floods when the rainfall amounts are continuous. In the overflow location identification step, a margin horizontal distance, which is the horizontal distance between the position of at least one of a pair of levees provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river and the position of the water edge on the same side as the position of one of the pair of water edges of the river read from a real-time observation video of the river, is calculated. Based on the margin horizontal distance between the upstream and downstream of the river and the real-time rainfall amount in the area near the river, a margin time, which is the time from now until the river floods at a plurality of positions between the upstream and downstream of the river, is calculated by referring to the pre-prepared data set. The overflow location is identified based on the calculated margin time. In the configuration of the above-described embodiment, in the preparation step, a data set is prepared that records the correspondence relationship between a plurality of margin horizontal distances, which are the horizontal distances between the position of at least one of a pair of levees provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river, and the position of the water edge on the same side as the position of one of the pair of water edges of the river, and a plurality of rainfall amounts, which is a combination of the plurality of margin horizontal distance / rainfall amount combinations, and a plurality of margin times, which are the times from now until the river floods when the rainfall is continuous. In the overflow location identification step, at each of a plurality of positions from the upstream to the downstream of the river, a margin horizontal distance is calculated, which is the horizontal distance between the position of at least one of a pair of levees provided on both banks of the river and the position of the water edge on the same side as the position of one of the pair of water edges of the river read from the real-time observation video of the river. Based on the margin horizontal distance between the upstream and downstream of the river and the real-time rainfall amount in the area near the river, a margin time, which is the time from now until the river floods at a plurality of positions from the upstream to the downstream of the river, is calculated by referring to the above-prepared data set. The overflow location is identified based on the calculated margin time. As a result, the overflow locations between the upstream and downstream of the river can be identified in real time.

[0027] In the river flood prediction method according to the embodiment of the present invention, in the overflow location identification step, a margin width distance is calculated by subtracting the water edge width distance, which is the width distance of a pair of water edges of the river read from the real-time observation video of the river, from the levee width distance, which is the width distance of a pair of levees provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river. Based on the margin width distance between the upstream and downstream of the river and the real-time rainfall amount in the area near the river, a margin time, which is the time from now until the river floods at a plurality of positions from the upstream to the downstream of the river, is calculated. The overflow location is identified based on the calculated margin time. In the configuration of the above-described embodiment, in the overflow location identification step, at each of a plurality of positions from the upstream to the downstream of the river, the margin width distance obtained by subtracting the water-edge width distance, which is the width distance of a pair of water edges of the river read from the real-time observation video of the river, from the embankment width distance, which is the width distance of a pair of embankments provided on both banks of the river, is calculated. Based on the margin width distance between the upstream and the downstream of the river and the real-time rainfall in the area near the river, the margin time, which is the time from now until the river overflows at a plurality of positions from the upstream to the downstream of the river, is calculated, and the overflow location is identified based on the calculated margin time. As a result, the overflow location between the upstream and the downstream of the river can be identified in real time.

[0028] The river flood prediction method according to the embodiment of the present invention is such that the preparation step prepares a dataset recording the correspondence between a plurality of margin width distance / rainfall combinations, which are combinations of a plurality of margin width distances obtained by subtracting the water-edge width distance, which is the width distance of a pair of water edges of the river, from the embankment width distance, which is the width distance of a pair of embankments provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river, and a plurality of rainfall amounts, and a plurality of margin times, which are the times from now until the river overflows when the rainfall is continuous. The overflow location identification step calculates the margin width distance obtained by subtracting the water-edge width distance, which is the width distance of a pair of water edges of the river read from the real-time observation video of the river, from the embankment width distance, which is the width distance of a pair of embankments provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river, and calculates the margin time, which is the time from now until the river overflows at a plurality of positions from the upstream to the downstream of the river, based on the calculated margin width distance and the real-time rainfall in the area near the river, by referring to the previously prepared dataset, and identifies the overflow location based on the calculated margin time. In the configuration of the above-described embodiment, in the preparation step, a dataset is prepared that records the correspondence relationship between a plurality of margin width distances, which is the difference between the water-edge width distance of a pair of riverbanks at each of a plurality of positions from the upstream to the downstream of the river and the embankment width distance of a pair of embankments provided on both banks of the river, and a plurality of rainfall amounts, and a plurality of margin times, which is the time from now until the river floods when the rainfall is continuous. In the overflow location identification step, the margin width distance is calculated by subtracting the water-edge width distance of a pair of riverbanks read from the real-time observation video of the river from the embankment width distance of a pair of embankments provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river. Based on the margin width distance between the upstream and downstream of the river and the real-time rainfall amount in the area near the river, the margin time, which is the time from now until the river floods at a plurality of positions from the upstream to the downstream of the river, is calculated by referring to the above-prepared dataset, and the overflow location is identified based on the calculated margin time. As a result, the overflow locations between the upstream and downstream of the river can be identified in real time.

[0029] In the river flood prediction method according to the embodiment of the present invention, in the preparation step, wide-area geographical data including a river and a pair of embankments provided on both banks of the river is prepared in advance. In the overflow location identification step, the overflow location is identified based on information on a pair of embankments of the river provided on both banks of the river read from the geographical data and information on a pair of water edges of the river read from the real-time observation video of the river at each of a plurality of positions from the upstream to the downstream of the river. In the configuration of the above-described embodiment, in the preparation step, wide-area geographical data including a river and a pair of embankments provided on both banks of the river is prepared in advance. In the overflow location identification step, the overflow location is identified based on information on a pair of embankments of the river provided on both banks of the river read from the geographical data and information on a pair of water edges of the river read from the real-time observation video of the river at each of a plurality of positions from the upstream to the downstream of the river. In the present invention, a pair of embankments of the river and a pair of water edges of the river are specified at the same position in the river length method. As a result, it is possible to accurately identify in real time the overflow locations from the upstream to the downstream of the river.

[0030] The river flood prediction method according to an embodiment of the present invention is such that in the preparation step, wide-area three-dimensional geographical data including a river and a pair of levees provided on both banks of the river are prepared in advance, the three-dimensional geographical data includes the elevation of the riverbed of the river, and in the overflow location identification step, based on the relative relationship between the levee height, which is the height of the river levee read from the three-dimensional geographical data at each of a plurality of positions from the upstream to the downstream of the river, and the water surface height of the river read from the real-time observation video of the river, it is determined whether there is a flood in the river, and the overflow locations are identified. In the configuration of the above embodiment, in the preparation step, wide-area three-dimensional geographical data including a river and a pair of levees provided on both banks of the river are prepared in advance. The three-dimensional geographical data includes the elevation of the riverbed of the river. In the overflow location identification step, based on the relative relationship between the levee height, which is the height of the river levee read from the three-dimensional geographical data at each of a plurality of positions from the upstream to the downstream of the river, and the water surface height of the river read from the real-time observation video of the river, it is determined whether there is a flood in the river, and the overflow locations are identified. As a result, the overflow locations can be identified in real time.

[0031] The river flood prediction method according to an embodiment of the present invention is such that in the preparation step, wide-area three-dimensional geographical data including a river and a pair of levees provided on both banks of the river are prepared in advance, the three-dimensional geographical data includes the elevation of the riverbed of the river, and in the overflow location identification step, when the relative relationship between the levee height, which is the height of the river levee read from the three-dimensional geographical data at each of a plurality of positions from the upstream to the downstream of the river, and the water surface height of the river read from the real-time observation video of the river becomes a predetermined relative relationship, it is determined that there is a flood in the river, and the locations of the levees where the relative relationship between the levee height and the water surface height from the upstream to the downstream of the river becomes the predetermined relative relationship are identified as the overflow locations. In the configuration of the above-described embodiment, in the preparation step, wide-area three-dimensional geographical data including a river and a pair of dikes provided on both banks of the river are prepared in advance. The three-dimensional geographical data includes the elevation of the riverbed of the river. In the overflow location identification step, when the relative relationship between the dike height, which is the height of the river dike read from the three-dimensional geographical data at each of a plurality of positions from the upstream to the downstream of the river, and the water surface height of the river read from the real-time observation video of the river becomes a predetermined relative relationship, it is determined that there is a river flood, and the location of the dike where the relative relationship between the dike height and the water surface height from the upstream to the downstream of the river becomes the predetermined relative relationship is identified as the overflow location. As a result, the overflow locations from the upstream to the downstream of the river can be accurately identified in real time.

[0032] The river flood prediction method according to an embodiment of the present invention is such that the preparation step prepares wide-area three-dimensional geographical data including a river and a pair of dikes provided on both banks of the river in advance, the three-dimensional geographical data includes the elevation of the riverbed of the river, and in the overflow location identification step, when the dike height, which is the height of the river dike read from the three-dimensional geographical data at each of a plurality of positions from the upstream to the downstream of the river, and the water surface height of the river read from the real-time observation video of the river match, it is determined that there is a river flood, and the location of the dike where the dike height and the water surface height from the upstream to the downstream of the river match is identified as the overflow location. In the configuration of the above-described embodiment, in the preparation step, wide-area three-dimensional geographical data including a river and a pair of dikes provided on both banks of the river are prepared in advance. The three-dimensional geographical data includes the elevation of the riverbed of the river. In the overflow location identification step, when the dike height, which is the height of the river dike read from the three-dimensional geographical data at each of a plurality of positions from the upstream to the downstream of the river, and the water surface height of the river read from the real-time observation video of the river match, it is determined that there is a river flood, and the location of the dike where the dike height and the water surface height from the upstream to the downstream of the river match is identified as the overflow location. As a result, the overflow location can be identified in real time.

[0033] The river flood prediction method according to an embodiment of the present invention is such that in the preparation step, wide-area three-dimensional geographical data including a river and a pair of levees provided on both banks of the river are prepared in advance, the three-dimensional geographical data includes the elevation of the riverbed of the river, and in the overflow location specifying step, at each of a plurality of positions from the upstream to the downstream of the river, a margin height is calculated which is the height obtained by subtracting the water surface height of the river read from the real-time observation video of the river from the levee height which is the height of the levee of the river read from the three-dimensional geographical data. When there is a position where the smallest margin height among those from the upstream to the downstream of the river is smaller than a preset set height, it is determined that there is a flood in the river, and the location of the levee at the position of the smallest margin height from the upstream to the downstream of the river is specified as the overflow location. In the configuration of the above embodiment, in the preparation step, wide-area three-dimensional geographical data including a river and a pair of levees provided on both banks of the river are prepared in advance. The three-dimensional geographical data includes the elevation of the riverbed of the river. In the overflow location specifying step, at each of a plurality of positions from the upstream to the downstream of the river, a margin height is calculated which is the height obtained by subtracting the water surface height of the river read from the real-time observation video of the river from the levee height which is the height of the levee of the river read from the three-dimensional geographical data. When there is a position where the smallest margin height among those from the upstream to the downstream of the river is smaller than a preset set height, it is determined that there is a flood in the river, and the location of the levee at the position of the smallest margin height from the upstream to the downstream of the river is specified as the overflow location. As a result, the overflow location can be specified in real time.

[0034] The river flood prediction method according to an embodiment of the present invention is such that in the preparation step, wide-area three-dimensional geographical data including a river and a pair of levees provided on both banks of the river is prepared in advance, the three-dimensional geographical data includes the elevation of the riverbed of the river, and in the overflow location specifying step, at each of a plurality of positions from the upstream to the downstream of the river, a margin height is calculated which is the height obtained by subtracting the water surface height of the river read from the real-time observation video of the river from the levee height which is the height of the levee of the river read from the three-dimensional geographical data, and based on the margin height between the upstream and the downstream of the river and the real-time rainfall in the area near the river, a margin time which is the time from now until the river floods at a plurality of positions from the upstream to the downstream of the river is calculated, and the overflow location is specified based on the calculated margin time. In the configuration of the above embodiment, in the preparation step, wide-area three-dimensional geographical data including a river and a pair of levees provided on both banks of the river is prepared in advance. The three-dimensional geographical data includes the elevation of the riverbed of the river. In the overflow location specifying step, at each of a plurality of positions from the upstream to the downstream of the river, a margin height is calculated which is the height obtained by subtracting the water surface height of the river read from the real-time observation video of the river from the levee height which is the height of the levee of the river read from the three-dimensional geographical data, and based on the margin height between the upstream and the downstream of the river and the real-time rainfall in the area near the river, a margin time which is the time from now until the river floods at a plurality of positions from the upstream to the downstream of the river is calculated, and the overflow location is specified based on the calculated margin time. As a result, the overflow location can be specified in real time.

[0035] The river flood prediction method according to an embodiment of the present invention is such that in the preparation step, wide-area three-dimensional geographical data including a river and a pair of levees provided on both banks of the river are prepared in advance, the three-dimensional geographical data includes the elevation of the riverbed of the river, and in the preparation step, a plurality of margin heights which are the heights obtained by subtracting the water surface height of the river from the levee height which is the height of the levee of the river at each of a plurality of positions from the upstream to the downstream of the river, a plurality of margin height / rainfall combinations which are combinations of the plurality of margin heights and a plurality of rainfall amounts, and a data set recording the correspondence between the plurality of margin times from now until the river floods when the rainfall is continuous from the upstream to the downstream of the river are prepared, and in the overflow location specifying step, a margin height which is the height obtained by subtracting the water surface height of the river read from the real-time observation video of the river from the levee height which is the height of the levee of the river read from the three-dimensional geographical data at each of a plurality of positions from the upstream to the downstream of the river is calculated, and based on the margin height between the upstream and the downstream of the river and the real-time rainfall amount in the area near the river, a margin time which is the time from now until the river floods at a plurality of positions between the upstream and the downstream of the river is calculated with reference to the data set prepared in advance, and the overflow location is specified based on the calculated margin time. In the configuration of the above-described embodiment, in the preparation step, wide-area three-dimensional geographical data including a pair of levees provided in advance on both banks of a river and the river is prepared. The three-dimensional geographical data includes the elevation of the riverbed of the river. And, in the preparation step, a plurality of margin heights obtained by subtracting the water surface height of the river from the levee height, which is the height of the river levee at each of a plurality of positions from the upstream to the downstream of the river, and a plurality of rainfall amounts, and a plurality of margin height / rainfall amount combinations, which are combinations thereof, and a dataset recording the correspondence between the plurality of margin times from the current time until the river floods when the rainfall is continuous from the upstream to the downstream of the river are prepared. In the overflow location identification step, a margin height obtained by subtracting the water surface height of the river read from the real-time observation video of the river from the levee height, which is the height of the river levee read from the three-dimensional geographical data at each of a plurality of positions from the upstream to the downstream of the river, is calculated, and based on the margin height from the upstream to the downstream of the river and the real-time rainfall amount in the area near the river, the margin time, which is the time from the current time until the river floods at a plurality of positions from the upstream to the downstream of the river, is calculated with reference to the above-prepared dataset, and the overflow location is identified based on the calculated margin time. As a result, the overflow location can be identified in real time.

Effects of the Invention

[0036] As described above, the river flood prediction method according to the present invention has the following effects due to its configuration. Based on the real-time observation video of the river, the presence or absence of river flooding due to rainfall is determined, and the inundation area, which is the area inundated by the water overflowing from the overflow location, is identified based on the overflow location, which is the location where the water in the river overflows the levee. Therefore, flooding can be predicted in real time and the inundation area can be identified. At each of a plurality of positions from the upstream to the downstream of the river, the relative relationship between the levees provided on both banks of the river and the water edge read from the real-time observation video of the river is evaluated, and based on the relative relationship and the real-time rainfall in the area near the river, the margin time, which is the time from now until the river floods, is calculated, and the overflow location is identified based on the calculated margin time. Therefore, the overflow location between the upstream and downstream of the river can be identified in real time. A dataset is prepared that records the correspondence between the combination of the relative relationship between the levees provided on both banks of the river and the water edges on both sides of the river, a plurality of rainfall amounts, and a plurality of margin times, which are the times from now until the river floods when the rainfall is continuous. At each of a plurality of positions from the upstream to the downstream of the river, the relative relationship between the levees provided on both banks of the river and the water edge read from the real-time observation video of the river is evaluated, and the margin time is calculated based on the relative relationship and the rainfall amount by referring to the previously prepared dataset. The overflow location is identified based on the calculated margin time. Therefore, the overflow location between the upstream and downstream of the river can be identified in real time. When the shortest margin time between the upstream and downstream of the river is shorter than a preset time, it is determined that there is a river flood, and the location of the levee at the position of the shortest margin time is identified as the overflow location. Therefore, the overflow location between the upstream and downstream of the real-time river can be identified. The telecommunications equipment associated with the position included in the flooded area is notified of the presence of flooding and the margin time or the time obtained by adding the margin time to the current time, which is the flood time when the river floods. Therefore, the relevant people can be informed in real time of the presence of flooding and the time. Since the overflow is judged based on the observation video obtained using a satellite, the wide-area flood can be predicted in real time and the flooded area can be identified. An arbitrary position and the telecommunications equipment are associated in advance, and the telecommunications equipment associated with the position included in the flooded area is notified of the presence of flooding. Therefore, the people who need to be informed of the occurrence of flooding can be accurately notified. A plurality of hazard maps in which the inundation areas expected when a specific location of the levee becomes the overflow location in advance are drawn are prepared in association with the plurality of specific locations of the levee, and the inundation area is specified based on the hazard map associated with the specified specific location of the levee. Therefore, the inundation area can be accurately specified. A plurality of hazard maps in which the rainfall in the area where the river flows continuously and the inundation areas expected when a specific location of the levee becomes the overflow location are drawn are prepared in advance, and the inundation area is specified based on the hazard map associated with the specified rainfall / specific levee location combination. Therefore, the inundation area when the rainfall is continuous can be accurately specified. A plurality of hazard maps in which the rainfall in the area where the river flows continuously and the inundation areas and inundation heights expected when a specific location of the levee becomes the overflow location are drawn are prepared in advance, and the inundation area and inundation height are specified based on the hazard map associated with the specified rainfall / specific levee location combination. Therefore, the inundation area and inundation height when the rainfall is continuous can be accurately specified. An arbitrary position is associated with a telecommunication device in advance, and it is notified that there is inundation and the arbitrary position inundation height to the telecommunication device associated with the position included in the inundation area. Therefore, the inundation area and inundation height when the rainfall is continuous can be accurately notified to the necessary people. The presence or absence of river flooding is determined based on the relative relationship between the position of one levee and the position of one waterside of the river read from the real-time observation video of the river at each of a plurality of positions from the upstream to the downstream of the river, and the overflow location is specified. Therefore, the overflow location between the upstream and downstream of the river can be specified in real time. When the relative relationship between the position of one levee and the position of one waterside of the river read from the real-time observation video of the river at each of a plurality of positions from the upstream to the downstream of the river becomes a predetermined relative relationship, it is determined that there is river flooding, and the location of the levee at the position where the predetermined relative relationship is established is specified as the overflow location. Therefore, the overflow location between the upstream and downstream of the river can be specified in real time. When it is determined that there is a river flood when the position of one levee coincides with the position of one water edge read from the real-time observation video of the river at each of a plurality of positions from the upstream to the downstream of the river, and the levee section at the coincident position is specified as the overflow section, the overflow section between the upstream and downstream of the river can be specified in real time. Based on the relative relationship between the levee width distance and the water edge width distance read from the real-time observation video of the river at each of a plurality of positions from the upstream to the downstream of the river, the presence or absence of a river flood is determined, and the overflow section is specified. Therefore, the overflow section between the upstream and downstream of the river can be specified in real time. When it is determined that there is a river flood when the relative relationship between the levee width distance and the water edge width distance read from the real-time observation video of the river at each of a plurality of positions from the upstream to the downstream of the river becomes a predetermined relative relationship, and the levee section at the position where the predetermined relative relationship is established is specified as the overflow section, the overflow section between the upstream and downstream of the river can be specified in real time. When it is determined that there is a river flood when the levee width distance of the river coincides with the water edge width distance read from the real-time observation video of the river at each of a plurality of positions from the upstream to the downstream of the river, and the levee section at the coincident position is specified as the overflow section, the overflow section between the upstream and downstream of the river can be specified in real time. At each of a plurality of positions from the upstream to the downstream of the river, the horizontal margin distance between the position of one levee and the position of one water edge on the same side as the position of one levee read from the real-time observation video of the river is calculated, and based on the horizontal margin distance and the real-time rainfall in the area near the river, the remaining time, which is the time until the river floods from now, is calculated. Based on the calculated remaining time, the overflow section is specified. Therefore, the overflow section between the upstream and downstream of the river can be calculated in real time. Prepare a dataset in which the correspondence between a plurality of safety margin horizontal distance / rainfall combinations and a plurality of safety margin times, which are the times from now until the river floods when rainfall is continuous, is recorded at each of a plurality of positions from the upstream to the downstream of the river in advance. Calculate the safety margin horizontal distance, which is the horizontal distance between the position of one embankment and the position of one waterside on the same side as the position of the one embankment read from the real-time observation video of the river. Based on the calculated safety margin horizontal distance and the real-time rainfall in the area near the river, calculate the safety margin time, which is the time from now until the river floods, by referring to the above-prepared dataset. Identify the overflow location based on the calculated safety margin time. In this way, the overflow locations between the upstream and downstream of the river can be identified in real time. Calculate the safety margin width distance obtained by subtracting the waterside width distance read from the real-time observation video of the river from the embankment width distance at each of a plurality of positions from the upstream to the downstream of the river. Based on the calculated safety margin width distance and the real-time rainfall in the area near the river, calculate the safety margin time, which is the time from now until the river floods. Identify the overflow location based on the calculated safety margin time. In this way, the overflow locations between the upstream and downstream of the river can be identified in real time. Prepare a dataset in which the correspondence between a combination of a plurality of safety margin width distances obtained by subtracting the waterside width distance from the embankment width distance and a plurality of rainfall amounts and a plurality of safety margin times, which are the times from now until the river floods when rainfall is continuous, is recorded at each of a plurality of positions from the upstream to the downstream of the river. Calculate the safety margin width distance obtained by subtracting the waterside width distance read from the real-time observation video of the river from the embankment width distance. Based on the calculated safety margin width distance and the real-time rainfall in the area near the river, calculate the safety margin time, which is the time from now until the river floods, by referring to the above-prepared dataset. Identify the overflow location based on the calculated safety margin time. In this way, the overflow locations between the upstream and downstream of the river can be identified in real time. Prepare wide-area geographical data in advance, and at each of a plurality of positions from the upstream to the downstream of the river, determine the presence or absence of river flooding due to rainfall based on the geographical data and the real-time observed video of the river, so as to identify the overflow locations from the upstream to the downstream of the river. Therefore, the overflow locations from the upstream to the downstream of the river can be accurately identified in real time. Prepare 3D geographical data including the elevation of the riverbed of a wide-area river in advance, and at each of a plurality of positions from the upstream to the downstream of the river, determine the presence or absence of river flooding based on the relative relationship between the riverbank height read from the 3D geographical data and the water surface height of the river read from the real-time observed video of the river, so as to identify the overflow locations. Therefore, the overflow locations can be identified in real time. Prepare 3D geographical data including the elevation of the riverbed of a wide-area river in advance. When the relative relationship between the riverbank height read from the 3D geographical data and the water surface height of the river read from the real-time observed video of the river at each of a plurality of positions from the upstream to the downstream of the river reaches a predetermined relative relationship, it is determined that there is river flooding, and the location of the riverbank at the position where the predetermined relative relationship is reached is identified as the overflow location. Therefore, the overflow locations from the upstream to the downstream of the river can be accurately identified in real time. Prepare 3D geographical data including the elevation of the riverbed of a wide-area river in advance. When the riverbank height read from the 3D geographical data and the water surface height of the river read from the real-time observed video of the river at each of a plurality of positions from the upstream to the downstream of the river match, it is determined that there is river flooding, and the location of the riverbank at the position where the riverbank height and the water surface height match from the upstream to the downstream of the river is identified as the overflow location. Therefore, the overflow location can be identified in real time. Prepare three-dimensional geographical data including the elevation of the riverbed of a wide-area river in advance, and at each of a plurality of positions from the upstream to the downstream of the river, calculate the margin height which is the height obtained by subtracting the water surface height of the river read from the real-time observation video of the river from the river embankment height read from the three-dimensional geographical data at that position. When there is a position where the smallest margin height from the upstream to the downstream of the river is smaller than a preset height, it is determined that there is a river flood, and the embankment section at the position of the smallest margin height from the upstream to the downstream of the river is specified as the overflow section. Therefore, the overflow section can be specified in real time. Prepare three-dimensional geographical data including the elevation of the riverbed of a wide-area river in advance, calculate the margin height which is the height obtained by subtracting the water surface height of the river read from the real-time observation video of the river from the river embankment height read from the three-dimensional geographical data at each of a plurality of positions from the upstream to the downstream of the river, calculate the margin time at a plurality of positions based on the margin height and the real-time rainfall in the area near the river, and can specify the overflow section based on the calculated margin time. Therefore, the overflow section can be specified in real time. Prepare a data set that records the correspondence between the combinations of a plurality of margin heights, which are the heights obtained by subtracting the water surface height of the river from the river embankment height, and a plurality of rainfall amounts, and the plurality of margin times from now until the river floods when the rainfall is continuous. Calculate the margin height which is the height obtained by subtracting the water surface height of the river read from the real-time observation video of the river from the river embankment height read from the three-dimensional geographical data, calculate the margin time at a plurality of positions based on the margin height and the real-time rainfall amount by referring to the previously prepared data set, and specify the overflow section based on the calculated margin time. Therefore, the overflow section can be specified in real time. Therefore, a river flood prediction method for predicting flooding in the area where the river flows during rainfall can be provided.

Brief Description of the Drawings

[0037]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0038] Hereinafter, embodiments for carrying out the present invention will be described. First, a river flood prediction system that executes the river flood prediction method according to the embodiment of the present invention will be described based on the drawings. FIG. 1 is the first conceptual diagram of the river flood prediction system according to the embodiment of the present invention.

[0039] The river flood prediction system according to the embodiment of the present invention is composed of a rainfall detection system, a satellite, a river flood prediction system, and a telecommunications device. The river flood prediction system according to the embodiment of the present invention may be composed of a rainfall detection system, a satellite, a river flood prediction system, a telecommunications device, and a teacher data providing system.

[0040] The river flood prediction system according to the embodiment of the present invention is a system for predicting river floods over a wide area during rainfall. The river flood prediction system according to an embodiment of the present invention may predict river floods in a wide area during rainfall and notify the predicted floods. The river flood prediction system according to an embodiment of the present invention may predict river floods in a wide area during rainfall and notify the flooding in the flooded area due to the predicted floods.

[0041] The rainfall detection system is a system that detects rainfall in a wide area. For example, the rainfall detection system is the JAXA Global Satellite Mapping of Precipitation (GSMAP) operated by the Japan Meteorological Agency. The meteorological agency provides short-term rainfall prediction data using the JAXA Global Satellite Mapping of Precipitation (GSMAP).

[0042] The artificial satellite is an observation satellite that can acquire observation images of rivers in a wide area. For example, the artificial satellites are the JAXA satellite constellation (ALOS series), commercial and microsatellite constellations (operated / conceived by multiple domestic companies), overseas satellite constellations, etc. The JAXA satellite constellation (ALOS series) conducts emergency observations during disasters. The commercial and microsatellite constellations conduct high-frequency observations from normal times. The overseas satellite constellations conduct emergency observations during disasters.

[0043] The river flood prediction system is a core system that executes a river flood prediction method. The river flood prediction system is composed of a PC and a support system. A program for executing the river flood prediction method is installed in the PC. The support system is a system that supports the execution of the river flood prediction method. For example, the support system prepares a data set and a hazard map necessary for executing the river flood prediction method.

[0044] The teacher data providing system prepares the teacher data necessary for creating the data set prepared by the support system. Figure 2 shows an example in which the teacher data providing system generates teacher data. The teacher data providing system generates teacher data by bidirectionally feeding back data between a virtual area model and a real area. The virtual area model is realized by an experimental model, a mathematical model, etc. The teacher data providing system has a modeling function, an analysis simulation function, and a feedback function. The modeling function visualizes and monitors the real situation based on the acquired data. The analysis simulation function verifies the state and changes under real data and virtual conditions. The feedback function reflects the results of monitoring, analysis, and simulation in the real world.

[0045] In addition, the river flood prediction system is used for providing flood prediction information to local governments, supporting the establishment of evacuation leadership, etc.

[0046] Hereinafter, the river flood prediction method according to an embodiment of the present invention will be described. The river flood prediction method according to an embodiment of the present invention is a method for predicting river floods over a wide area during rainfall. The river flood prediction method according to an embodiment of the present invention is composed of a preparation step and an overflow location identification step. Execute the preparation step and repeatedly execute the overflow location identification step during rainfall. The river flood prediction method according to an embodiment of the present invention may be composed of a preparation step, an overflow location identification step, and a flooded area identification step. Execute the preparation step and repeatedly execute the overflow location identification step during rainfall. When it is determined in the overflow location identification step that there is a river flood due to rainfall, execute the flooded area identification step. The river flood prediction method according to an embodiment of the present invention may be composed of a preparation step, an overflow location identification step, a flooded area identification step, and a flood notification step. Execute the preparation process in advance, repeatedly execute the overflow location identification process during rainfall, and when it is determined in the overflow location identification process that there is a river flood due to rainfall, execute the inundation area identification process and the inundation notification process.

[0047] The preparation process is a process of preparation. In the preparation process, an arbitrary position and an electric communication device may be associated in advance. In the preparation process, wide-area geographical data including a river and a pair of levees provided on both banks of the river may be prepared in advance. In the preparation process, wide-area two-dimensional geographical data including a river and a pair of levees provided on both banks of the river may be prepared in advance. The two-dimensional geographical data is map data of a wide area seen from above. The two-dimensional geographical data has information on the river seen from above in a wide area. The two-dimensional geographical data has information on the levees of the river seen from above in a wide area. The two-dimensional geographical data has information on the levees on both banks of the river seen from above in a wide area. The two-dimensional geographical data has information on the water edge of the river seen from above in a wide area. The two-dimensional geographical data has information on the water edges on both sides of the river seen from above in a wide area. In the preparation process, wide-area three-dimensional geographical data including a river and a pair of levees provided on both banks of the river may be prepared in advance. The three-dimensional geographical data may include the elevation of the riverbed of the river. The preparation process may prepare a data set in advance. The details of the data set will be described later. The preparation process may prepare a plurality of hazard maps in advance. The details of the hazard map will be described later.

[0048] The overflow location identification process is a process of determining the presence or absence of a river flood due to rainfall based on real-time observation videos of the river, and identifying an overflow location X, which is a location where the river water overflows the levee between the upstream and downstream of the river. In the overflow location identification process, based on geographical data and real-time observation images of the river, it is possible to determine whether there is a river flood caused by rainfall, and identify the overflow location X where the river water overflows the river embankment from the upstream to the downstream of the river. In the overflow location identification process, based on three-dimensional geographical data and real-time observation images of the river, it is possible to determine whether there is a river flood caused by rainfall, and identify the overflow location where the river water overflows the river embankment from the upstream to the downstream of the river. In the overflow location identification process, based on three-dimensional geographical data and real-time observation images of the river, it is possible to determine whether there is a river flood caused by rainfall, and identify the remaining time, which is the time from now until the river floods, and the overflow location X where the river water overflows the river embankment from the upstream to the downstream of the river.

[0049] The observation image may be an image obtained using an artificial satellite. In the overflow location identification process, based on the real-time observation image of the river obtained using an artificial satellite, it is possible to determine whether there is a river flood caused by rainfall, and identify the overflow location X where the river water overflows the river embankment from the upstream to the downstream of the river. In the overflow location identification process, based on geographical data and the real-time observation image of the river obtained using an artificial satellite, it is possible to determine whether there is a river flood caused by rainfall, and identify the overflow location X where the river water overflows the river embankment from the upstream to the downstream of the river. In the overflow location identification process, based on three-dimensional geographical data and the real-time observation image of the river obtained using an artificial satellite, it is possible to determine whether there is a river flood caused by rainfall, and identify the overflow location X where the river water overflows the river embankment from the upstream to the downstream of the river. In the overflow location identification process, based on three-dimensional geographical data and the real-time observation image of the river obtained using an artificial satellite, it is possible to determine whether there is a river flood caused by rainfall, and identify the remaining time, which is the time from now until the river floods, and the overflow location X where the river water overflows the river embankment from the upstream to the downstream of the river.

[0050] In the overflow location identification process, evaluate the relative relationship between the levees provided on both banks of the river and the water edges on both sides of the river read from the real-time observation video of the river at each of a plurality of positions from the upstream to the downstream of the river, and calculate the remaining time, which is the time from now until the river floods at a plurality of positions from the upstream to the downstream of the river, based on the relative relationship between the upstream and downstream of the river and the real-time rainfall in the area near the river. The overflow location X may be identified based on the calculated remaining time.

[0051] In the overflow location identification process, evaluate the relative relationship between the levees provided on both banks of the river and the water edges on both sides of the river read from the real-time observation video of the river at each of a plurality of positions from the upstream to the downstream of the river, and calculate the remaining time, which is the time from now until the river floods at a plurality of positions from the upstream to the downstream of the river, with reference to a pre-prepared dataset based on the relative relationship between the upstream and downstream of the river and the real-time rainfall in the area near the river. The overflow location X may be identified based on the calculated remaining time. In the preparation process, prepare a dataset that records the correspondence between a plurality of relative relationship / rainfall combinations, which are combinations of the relative relationship between the levees provided on both banks of the river and the water edges on both sides of the river at each of a plurality of positions from the upstream to the downstream of the river and a plurality of rainfall amounts, and a plurality of remaining times, which are the times from now until the river floods when the rainfall is continuous. In the preparation process, prepare a dataset that records the correspondence between a plurality of relative relationship / rainfall combinations, which are combinations of the relative relationship between the levees provided on both banks of the river and the water edges on both sides of the river at each of a plurality of positions from the upstream to the downstream of the river read from the geographical data and a plurality of rainfall amounts, and a plurality of remaining times, which are the times from now until the river floods when the rainfall is continuous.

[0052] In the overflow location identification process, evaluate the relative relationship between the levees provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river read from the geographical data and the water edges on both sides of the river read from the real-time observation video of the river, and based on the relative relationship from the upstream to the downstream of the river and the real-time rainfall in the area near the river, calculate the remaining time, which is the time from now until the river floods, at a plurality of positions from the upstream to the downstream of the river, and the overflow location X may be identified based on the calculated remaining time.

[0053] In the overflow location identification process, evaluate the relative relationship between the levees provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river read from the geographical data and the water edges on both sides of the river read from the real-time observation video of the river, and calculate the remaining time, which is the time from now until the river floods, at a plurality of positions from the upstream to the downstream of the river based on the relative relationship from the upstream to the downstream of the river and the real-time rainfall in the area near the river with reference to a prepared dataset, and the overflow location X may be identified based on the calculated remaining time. In the preparation process, prepare a dataset that records the correspondence between a plurality of relative relationship / rainfall combinations, which are combinations of the relative relationship between the levees provided on both banks of the river and the water edges on both sides of the river at each of a plurality of positions from the upstream to the downstream of the river and a plurality of rainfall amounts, and a plurality of remaining times, which are the times from now until the river floods when the rainfall is continuous. In the preparation process, prepare a dataset that records the correspondence between a plurality of relative relationship / rainfall combinations, which are combinations of the relative relationship between the levees provided on both banks of the river and the water edges on both sides of the river at each of a plurality of positions from the upstream to the downstream of the river read from the geographical data and a plurality of rainfall amounts, and a plurality of remaining times, which are the times from now until the river floods when the rainfall is continuous.

[0054] In the overflow location identification process, when the shortest remaining time from the upstream to the downstream of the river is shorter than a preset time, it may be determined that there is a river flood, and the location of the levee at the position where the shortest remaining time from the upstream to the downstream of the river is located may be identified as the overflow location X.

[0055] The flooded area specifying step is a step of specifying a flooded area S which is an area flooded by water overflowing from an overflow point X specified in the overflow point specifying step, based on the overflow point X. In the flooded area specifying step, the flooded area S which is an area flooded by water overflowing from the overflow point X may be specified based on the real-time rainfall amount in the area where the river flows and the overflow point X specified in the overflow point specifying step.

[0056] In the flooded area specifying step, the flooded area may be specified based on a hazard map associated with the embankment specified location that has become the overflow point X. In the preparation step, a plurality of hazard maps which are map data depicting the flooded area S expected when a specified location of a pair of embankments provided on both banks of the river between the upstream and downstream of the river in advance becomes the overflow point X are prepared by associating them with a plurality of the embankment specified locations respectively.

[0057] In the flooded area specifying step, the flooded area S may be specified based on a hazard map associated with the combination of the real-time rainfall amount in the area where the river flows and the embankment specified location that has become the specified overflow point X, i.e., the rainfall amount / embankment specified location combination. In the preparation step, a plurality of hazard maps which are map data depicting the flooded area S expected when a specified location of a pair of embankments provided on both banks of the river between the upstream and downstream of the river in advance becomes the overflow point X, with continuous rainfall amount in the area where the river flows, are prepared by associating them with a plurality of combinations of the rainfall amounts and the embankment specified locations, i.e., a plurality of rainfall amount / embankment specified location combinations.

[0058] In the flooded area specifying step, the flooded area S and the flooding height may be specified based on a hazard map associated with the combination of the real-time rainfall amount in the area where the river flows and the embankment specified location that has become the specified overflow point X, i.e., the rainfall amount / embankment specified location combination. In the preparation process, map data depicting a flooded area S expected when a specific location of a pair of levees provided on both banks of a river from the upstream to the downstream becomes an overflow location X, where rainfall in the area near the river is continuous in advance, and the flood height at any position included in the flooded area, is prepared in association with each of a plurality of rainfall amounts / specific levee location combinations, which are combinations of a plurality of such rainfall amounts and a plurality of specific levee locations.

[0059] The flood notification process is a process of notifying a telecommunications device associated with a position included in the flooded area S that there is flooding. In the flood notification process, it may also be possible to notify the telecommunications device associated with a position included in the flooded area S that there is flooding and the flood time obtained by adding a margin time or the current time plus the margin time.

[0060] In the flood notification process, it may be possible to notify the telecommunications device associated with a position included in the flooded area S that there is flooding and the flood height at an arbitrary position, which is the flood height at an arbitrary position associated with the telecommunications device. In the flood notification process, it may be possible to notify the telecommunications device associated with a position included in the flooded area S that there is flooding, the flood time obtained by adding a margin time or the current time plus the margin time, and the flood height at an arbitrary position, which is the flood height at an arbitrary position associated with the telecommunications device.

[0061] The overflow location identification process is repeatedly executed. During rainfall, the overflow location identification process may be repeatedly executed.

[0062] The overflow location identification process is repeatedly executed, and when it is determined in the overflow location identification process that there is flooding of the river due to rainfall, the flooded area identification process may be executed. During rainfall, the overflow location identification process is repeatedly executed, and when it is determined in the overflow location identification process that there is flooding of the river due to rainfall, the flooded area identification process may be executed.

[0063] If the overflow location identification process is repeatedly executed and it is determined in the overflow location identification process that there is a river flood due to rainfall, the inundation area identification process and the inundation notification process may be executed. During rainfall, the overflow location identification process may be repeatedly executed, and when it is determined in the overflow location identification process that there is a river flood due to rainfall, the inundation area identification process and the inundation notification process may be executed.

[0064] Hereinafter, a plurality of overflow location identification processes in the river flood prediction method according to an embodiment of the present invention will be described in detail with reference to the drawings.

[0065] FIG. 3 shows the relative relationship between the position t of at least one of a pair of levees provided on both banks of a river and the position w of the water edge on the same side as the position of one of the pair of water edges of the river. In the overflow location identification process, based on the relative relationship between the position t of at least one of a pair of levees provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river and the position w of the water edge on the same side as the position of one of the pair of water edges of the river read from the real-time observation video of the river, the presence or absence of a river flood may be determined, and the overflow location X may be identified. In the overflow location identification process, based on the relative relationship between the position t of at least one of a pair of levees provided on both banks of the river read from the geographical data and the position w of the water edge on the same side as the position of one of the pair of water edges of the river read from the real-time observation video of the river at each of a plurality of positions from the upstream to the downstream of the river, the presence or absence of a river flood may be determined, and the overflow location X may be identified.

[0066] In the overflow location identification process, when the relative relationship between the position t of at least one of a pair of levees provided on both banks of the river and the position w of the water edge on the same side as the position of one of the pair of water edges of the river read from the real-time observation video of the river at each of a plurality of positions from the upstream to the downstream of the river becomes a predetermined relative relationship, it is determined that there is a river flood, and the location of the levee where the relative relationship between the position t of the river levee and the position w of the water edge from the upstream to the downstream of the river becomes the predetermined relative relationship may be identified as the overflow location X. In the overflow location identification process, when the relative relationship between the position t of at least one of the pair of levees provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river and the position w of the water edge on the same side as the position of one of the pair of water edges of the river read from the real-time observation video of the river becomes a predetermined relative relationship, it is determined that there is a river flood, and the location of the levee at the position where the relative relationship between the position t of the levee of the river and the position w of the water edge from the upstream to the downstream of the river becomes the predetermined relative relationship may be specified as the overflow location X.

[0067] In the overflow location identification process, when the position t of at least one of the pair of levees provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river and the position w of the water edge on the same side as the position of one of the pair of water edges of the river read from the real-time observation video of the river coincide, it is determined that there is a river flood, and the location of the levee at the position where the position t of one of the levees of the river and the position w of one of the water edges coincide from the upstream to the downstream of the river may be specified as the overflow location X. At this time, set the margin time to zero. In the overflow location identification process, when the position t of at least one of the pair of levees provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river and the position w of the water edge on the same side as the position of one of the pair of water edges of the river read from the real-time observation video of the river coincide, it is determined that there is a river flood, and the location of the levee at the position where the position t of one of the levees and the position w of one of the water edges coincide from the upstream to the downstream of the river may be specified as the overflow location X. At this time, set the margin time to zero.

[0068] Fig. 4 shows the relative relationship between the levee width distance Bt, which is the width distance of a pair of levees provided on both banks of the river, and the water edge width distance Bw, which is the width distance of a pair of water edges of the river, at each of a plurality of positions from the upstream to the downstream of the river. The perspective view of Fig. 4 shows how the relative relationship is evaluated at each of nine positions from the upstream to the downstream of the river. In the overflow location identification process, based on the relative relationship between the bank width distance Bt, which is the width distance between a pair of levees provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river, and the water edge width distance Bw, which is the width distance of a pair of water edges of the river read from the real-time observation video of the river, the presence or absence of river flooding may be determined to identify the overflow location X. In the overflow location identification process, based on the relative relationship between the bank width distance Bt, which is the width distance between a pair of levees provided on both banks of the river read from three-dimensional geographical data at each of a plurality of positions from the upstream to the downstream of the river, and the water edge width distance Bw, which is the width distance of a pair of water edges of the river read from the real-time observation video of the river, the presence or absence of river flooding may be determined to identify the overflow location X.

[0069] In the overflow location identification process, when the relative relationship between the bank width distance Bt, which is the width distance between a pair of levees provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river, and the water edge width distance Bw, which is a pair of water edge width distances read from the real-time observation video of the river, becomes a predetermined relative relationship, it is determined that there is river flooding, and the location of the levee where the relative relationship between the bank width distance Bt and the water edge width distance Bw from the upstream to the downstream of the river becomes the predetermined relative relationship may be identified as the overflow location X. In the overflow location identification process, when the relative relationship between the bank width distance Bt, which is the width distance between a pair of levees provided on both banks of the river read from geographical data at each of a plurality of positions from the upstream to the downstream of the river, and the water edge width distance Bw, which is the width distance of a pair of water edges of the river read from the real-time observation video of the river, becomes a predetermined relative relationship, it is determined that there is river flooding, and the location of the levee where the relative relationship between the bank width distance Bt and the water edge width distance Bw from the upstream to the downstream of the river becomes the predetermined relative relationship may be identified as the overflow location X. Each of the bank width distance Bt and the water edge width distance Bw is measured at the same position in the river length direction.

[0070] In the overflow location identification process, when the embankment width distance Bt, which is the width distance between a pair of embankments provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river, and the waterside width distance Bw, which is the width distance of a pair of watersides of the river read from the real-time observation video of the river, match, it may be determined that there is a river flood, and the location of the embankment where the embankment width distance Bt and the waterside width distance Bw match from the upstream to the downstream of the river may be identified as the overflow location X. In the overflow location identification process, when the embankment width distance Bt, which is the width distance between a pair of embankments provided on both banks of the river read from the three-dimensional geographical data at each of a plurality of positions from the upstream to the downstream of the river, and the waterside width distance Bw, which is the width distance of a pair of watersides of the river read from the real-time observation video of the river, match, it may be determined that there is a river flood, and the location of the embankment where the embankment width distance Bt and the waterside width distance Bw match from the upstream to the downstream of the river may be identified as the overflow location X. At this time, set the margin time to zero.

[0071] Fig. 5 shows the margin horizontal distance H, which is the horizontal distance between the position t of at least one of the pair of embankments provided on both banks of the river and the waterside position w on the same side as the position of one of the pair of watersides of the river. In the overflow location identification process, calculate the margin horizontal distance, which is the horizontal distance between the position t of at least one of the pair of embankments provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river and the waterside position w on the same side as the position of one of the pair of watersides of the river read from the real-time observation video of the river, and calculate the margin time, which is the time from now until the river floods at a plurality of positions from the upstream to the downstream of the river, based on the margin horizontal distance H between the upstream and downstream of the river and the real-time rainfall in the area near the river. In the overflow location identification process, at each of a plurality of positions from the upstream to the downstream of the river, a margin horizontal distance H is calculated, which is the horizontal distance between the position t of at least one of a pair of levees provided on both banks of the river read from geographical data and the position w of the water edge on the same side as the position of one of the pair of water edges read from the real-time observation video of the river. Based on the margin horizontal distance H from the upstream to the downstream of the river and the real-time rainfall in the area near the river, a margin time may be calculated, which is the time from now until the river floods at a plurality of positions from the upstream to the downstream of the river.

[0072] In the overflow location identification process, at each of a plurality of positions from the upstream to the downstream of the river, a margin horizontal distance H is calculated, which is the horizontal distance between the position t of at least one of a pair of levees provided on both banks of the river and the position w of the water edge on the same side as the position of one of the pair of water edges of the river read from the real-time observation video of the river. Based on the margin horizontal distance H from the upstream to the downstream of the river and the real-time rainfall in the area near the river, the margin time, which is the time from now until the river floods at a plurality of positions from the upstream to the downstream of the river, may be calculated by referring to a pre-prepared dataset. In the overflow location identification process, at each of a plurality of positions from the upstream to the downstream of the river, a margin horizontal distance H is calculated, which is the horizontal distance between the position t of at least one of a pair of levees provided on both banks of the river read from geographical data and the position w of the water edge on the same side as the position of one of the pair of water edges of the river read from the real-time observation video of the river. Based on the margin horizontal distance H from the upstream to the downstream of the river and the real-time rainfall in the area near the river, the margin time, which is the time from now until the river floods at a plurality of positions from the upstream to the downstream of the river, may be calculated by referring to a pre-prepared dataset. In the preparation process, a dataset is prepared that records the correspondence relationship between a plurality of margin horizontal distances H, which are the horizontal distances between the position t of at least one of a pair of levees provided on both banks of a river at each of a plurality of positions from the upstream to the downstream of the river and the position w of the water edge on the same side as the position of one of the pair of water edges of the river, and a plurality of rainfall amounts, and a plurality of margin times, which are the times from now until the river floods when the rainfall is continuous.

[0073] Figure 6 shows a margin width distance Bwt obtained by subtracting the water edge width distance Bw, which is the width distance of a pair of water edges of the river, from the levee width distance Bt, which is the width distance of a pair of levees provided on both banks of the river. In the overflow location identification process, a margin width distance Bwt is calculated by subtracting the water edge width distance Bw, which is the width distance of a pair of water edges of the river read from the real-time observation video of the river, from the levee width distance Bt, which is the width distance of a pair of levees provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river. Based on the margin width distance Bwt between the upstream and downstream of the river and the real-time rainfall amount in the area near the river, a margin time, which is the time from now until the river floods at a plurality of positions between the upstream and downstream of the river, may be calculated. In the overflow location identification process, a margin width distance Bwt is calculated by subtracting the water edge width distance Bw, which is the width distance of a pair of water edges of the river read from the real-time observation video of the river, from the levee width distance Bt, which is the width distance of a pair of levees provided on both banks of the river read from three-dimensional geographical data at each of a plurality of positions from the upstream to the downstream of the river. Based on the margin width distance Bwt between the upstream and downstream of the river and the real-time rainfall amount in the area near the river, a margin time, which is the time from now until the river floods at a plurality of positions between the upstream and downstream of the river, may be calculated.

[0074] In the overflow location identification process, at each of a plurality of positions from the upstream to the downstream of the river, a margin width distance Bwt is calculated by subtracting the water-edge width distance Bw, which is a pair of water-edge width distances of the river read from the real-time observation video of the river, from the embankment width distance Bt, which is the width distance of a pair of embankments provided on both banks of the river. Based on the margin width distance Bwt and the real-time rainfall in the area near the river, the margin time, which is the time from now until the river floods at a plurality of positions from the upstream to the downstream of the river, may be calculated with reference to a pre-prepared dataset. In the overflow location identification process, at each of a plurality of positions from the upstream to the downstream of the river, a margin width distance Bwt is calculated by subtracting the water-edge width distance Bw, which is a pair of water-edge width distances of the river read from the real-time observation video of the river, from the embankment width distance Bt, which is the width distance of a pair of embankments provided on both banks of the river read from the geographical data. Based on the margin width distance Bwt at a plurality of positions from the upstream to the downstream of the river and the real-time rainfall in the area near the river, the margin time, which is the time from now until the river floods at a plurality of positions from the upstream to the downstream of the river, may be calculated with reference to a pre-prepared dataset. The preparation process may prepare a dataset recording the correspondence relationship between a plurality of margin width distance / rainfall combinations, which are combinations of a plurality of margin width distances Bwt obtained by subtracting the water-edge width distance Bw, which is a pair of water-edge width distances of the river, from the embankment width distance Bt, which is the width distance of a pair of embankments provided on both banks of the river, at each of a plurality of positions from the upstream to the downstream of the river, and a plurality of rainfall amounts, and a plurality of margin times, which are the times from now until the river floods when the rainfall is continuous.

[0075] Fig. 7 shows the correlation between the embankment height Vt, which is the height of the embankments on both banks of the river, and the water surface height Vw of the river. In the overflow location identification process, based on the relative relationship between the embankment height Vt, which is the height of the river embankment read from the three-dimensional geographical data, and the water surface height Vw of the river read from the real-time observation video of the river, at each of a plurality of positions from the upstream to the downstream of the river, the presence or absence of river flooding may be determined, and the overflow location X may be identified.

[0076] In the overflow location identification process, when the relative relationship between the embankment height Vt of the river, which is read from three-dimensional geographical data at each of a plurality of positions from the upstream to the downstream of the river, and the water surface height Vw of the river, which is read from the real-time observation video of the river, becomes a predetermined relative relationship, it is determined that there is a river flood, and the embankment location where the relative relationship between the embankment height Vt and the water surface height Vw from the upstream to the downstream of the river becomes the predetermined relative relationship may be identified as the overflow location X.

[0077] In the overflow location identification process, when the embankment height of the river, which is read from three-dimensional geographical data at each of a plurality of positions from the upstream to the downstream of the river, and the water surface height Vw of the river, which is read from the real-time observation video of the river, match, it is determined that there is a river flood, and the embankment location where the embankment height Vt and the water surface height Vw from the upstream to the downstream of the river match may be identified as the overflow location X.

[0078] FIG. 8 shows the remaining height Vwt, which is the height obtained by subtracting the water surface height Vw of the river from the embankment height Vt of the river. The overflow location identification process calculates the remaining height Vwt, which is the height obtained by subtracting the water surface height Vw of the river, which is read from the real-time observation video of the river, from the embankment height Vt of the river, which is read from three-dimensional geographical data at each of a plurality of positions from the upstream to the downstream of the river. When there is a position where the smallest remaining height Vwt from the upstream to the downstream of the river is smaller than a preset height, it is determined that there is a river flood, and the embankment location at the position of the smallest remaining height Vwt from the upstream to the downstream of the river may be identified as the overflow location X.

[0079] In the overflow location identification process, at each of a plurality of positions from the upstream to the downstream of the river, a margin height Vwt is calculated, which is the height obtained by subtracting the water surface height Vw of the river read from the real-time observation video of the river from the levee height Vt of the river read from the three-dimensional geographical data. Based on the margin height Vwt between the upstream and downstream of the river and the real-time rainfall in the area near the river, a margin time, which is the time from now until the river floods at a plurality of positions between the upstream and downstream of the river, is calculated. The overflow location X may be identified based on the calculated margin time.

[0080] In the overflow location identification process, at each of a plurality of positions from the upstream to the downstream of the river, a margin height Vwt is calculated, which is the height obtained by subtracting the water surface height Vw of the river read from the real-time observation video of the river from the levee height Vt of the river read from the three-dimensional geographical data. Based on the margin height Vwt between the upstream and downstream of the river and the real-time rainfall in the area near the river, a margin time, which is the time from now until the river floods at a plurality of positions between the upstream and downstream of the river, is calculated by referring to a pre-prepared dataset. The overflow location X may be identified based on the calculated margin time. In the preparation process, a dataset is prepared that records the correspondence between a plurality of margin height / rainfall combinations, which are combinations of a plurality of margin heights Vwt (the height obtained by subtracting the water surface height Vw of the river from the levee height Vt at each of a plurality of positions from the upstream to the downstream of the river) and a plurality of rainfall amounts, and a plurality of margin times from now until the river floods when the rainfall is continuous from the upstream to the downstream of the river.

[0081] As described above, when the river flood prediction method according to the embodiment of the present invention is used, it has the following effects. Based on the real-time observation video of the river, the presence or absence of river flooding due to rainfall is determined, and the flooded area S, which is the area flooded by the water overflowing from the overflow location X, where the water in the river overflows the levee, is identified. Therefore, flooding can be predicted in real time and the flooded area can be identified. At each of a plurality of positions from the upstream to the downstream of the river, the relative relationship between the levees provided on both banks of the river and the water edge read from the real-time observation video of the river is evaluated, and based on the relative relationship and the real-time rainfall in the area near the river, the margin time, which is the time from now until the river floods, is calculated. Since the overflow location X is identified based on the calculated margin time, the overflow location X from the upstream to the downstream of the river can be identified in real time. A dataset is prepared that records the correspondence between the relative relationship between the levees provided on both banks of the river and the water edges on both sides of the river, the combination of a plurality of rainfall amounts, and a plurality of margin times, which are the times from now until the river floods when the rainfall is continuous, at each of a plurality of positions from the upstream to the downstream of the river. The relative relationship between the levees provided on both banks of the river and the water edge read from the real-time observation video of the river is evaluated, and based on the relative relationship and the rainfall amount, the margin time is calculated by referring to the pre-prepared dataset. Since the overflow location X is identified based on the calculated margin time, the overflow location X from the upstream to the downstream of the river can be calculated in real time. When the shortest margin time from the upstream to the downstream of the river is shorter than a preset time, it is determined that there is a flood in the river, and the location of the levee at that position, which is the shortest margin time, is identified as the overflow location X. Therefore, the overflow location X can be identified from the upstream to the downstream of the real-time river. The telecommunications equipment associated with the positions included in the flooded area is notified of the presence of flooding and the margin time or the time obtained by adding the margin time to the current time, which is the flood time when the river floods. Therefore, it is possible to notify the necessary people in real time of the presence of flooding and the time. Since the overflow is judged based on the observation video obtained using a satellite, a wide-area flood can be predicted in real time and the flooded area can be identified. An arbitrary position and the telecommunications equipment are associated in advance, and the telecommunications equipment associated with the positions included in the flooded area S is notified of the presence of flooding. Therefore, it is possible to accurately notify the people who wish to know about the occurrence of flooding. A plurality of hazard maps depicting the inundation area S expected when a specific location of the levee has become the overflow location X in advance are prepared in association with a plurality of specific locations of the levee, and the inundation area S is specified based on the hazard map associated with the specified specific location of the levee. Therefore, the inundation area can be accurately specified. A plurality of hazard maps depicting the inundation area S expected when the rainfall in the area where the river flows is continuous and a specific location of the levee has become the overflow location X are prepared in advance, and the inundation area S is specified based on the hazard map associated with the specified rainfall / specific levee location combination. Therefore, the inundation area when the rainfall is continuous can be accurately specified. A plurality of hazard maps depicting the inundation area S and the inundation height expected when the rainfall in the area where the river flows is continuous and a specific location of the levee has become the overflow location X are prepared in advance, and the inundation area S and the inundation height are specified based on the hazard map associated with the specified rainfall / specific levee location combination. Therefore, the inundation area and the inundation height when the rainfall is continuous can be accurately specified. Any position is associated with a telecommunication device in advance, and the fact that the telecommunication device associated with the position included in the inundation area S is inundated and the inundation height at any position are notified. Therefore, the inundation area and the inundation height when the rainfall is continuous can be accurately notified to the necessary people. Based on the relative relationship between the position t of one levee and the position w of one water edge of the river read from the real-time observation video of the river at each of a plurality of positions from the upstream to the downstream of the river, the presence or absence of river flooding is determined to specify the overflow location X. Therefore, the overflow location X between the upstream and downstream of the river can be specified in real time. When the relative relationship between the position t of one levee and the position w of one water edge of the river read from the real-time observation video of the river at each of a plurality of positions from the upstream to the downstream of the river becomes a predetermined relative relationship, it is determined that there is river flooding, and the location of the levee at the position where the predetermined relative relationship is obtained is specified as the overflow location X. Therefore, the overflow location X between the upstream and downstream of the river can be specified in real time. When it is determined that there is a river flood when the position t of one levee matches the position w of one water edge read from the real-time observation video of the river at each of a plurality of positions from the upstream to the downstream of the river, and the location of the levee at the matching position is specified as the overflow location X, the overflow location X between the upstream and downstream of the river can be specified in real time. Based on the relative relationship between the levee width distance Bt and the water edge width distance Bw read from the real-time observation video of the river at each of a plurality of positions from the upstream to the downstream of the river, the presence or absence of a river flood is determined, and the overflow location X is specified. Therefore, the overflow location X between the upstream and downstream of the river can be specified in real time. When it is determined that there is a river flood when the relative relationship between the levee width distance Bt and the water edge width distance Bw read from the real-time observation video of the river at each of a plurality of positions from the upstream to the downstream of the river becomes a predetermined relative relationship, and the location of the levee at the position where the predetermined relative relationship is obtained is specified as the overflow location X, the overflow location X between the upstream and downstream of the river can be specified in real time. When it is determined that there is a river flood when the levee width distance Bt of the river matches the water edge width distance Bw read from the real-time observation video of the river at each of a plurality of positions from the upstream to the downstream of the river, and the location of the levee at the matching position is specified as the overflow location X, the overflow location X between the upstream and downstream of the river can be specified in real time. Calculate the margin horizontal distance H between the position t of one levee and the position w of one water edge read from the real-time observation video of the river at each of a plurality of positions from the upstream to the downstream of the river, calculate the margin time, which is the time until the river floods from now, based on the margin horizontal distance H and the real-time rainfall in the area near the river, and specify the overflow location X based on the calculated margin time. Therefore, the overflow location X between the upstream and downstream of the river can be specified in real time. Prepare a dataset in which the correspondence between a plurality of safety horizontal distance / rainfall combinations and a plurality of safety times, which are the times from now until the river floods when rainfall is continuous, is recorded at each of a plurality of positions from the upstream to the downstream of the river in advance. Calculate a safety horizontal distance H, which is the horizontal distance between the position t of one levee and the position w of one water edge read from the real-time observation video of the river, at each of a plurality of positions from the upstream to the downstream of the river, and calculate the safety time, which is the time from now until the river floods, based on the safety horizontal distance H and the real-time rainfall in the area near the river, by referring to the pre-prepared dataset. Since the overflow location X is specified based on the calculated safety time, the overflow location X can be specified in real time between the upstream and downstream of the river. Calculate a safety width distance Bwt obtained by subtracting the water edge width distance Bw read from the real-time observation video of the river from the levee width distance Bt at each of a plurality of positions from the upstream to the downstream of the river, and calculate the safety time, which is the time from now until the river floods, based on the safety width distance Bwt and the real-time rainfall in the area near the river. Since the overflow location X is specified based on the calculated safety time, the overflow location X can be specified in real time between the upstream and downstream of the river. Prepare a dataset in which the correspondence between a combination of a plurality of safety width distances Bwt obtained by subtracting the water edge width distance Bw from the levee width distance Bt and a plurality of rainfalls and a plurality of safety times, which are the times from now until the river floods when rainfall is continuous, is recorded at each of a plurality of positions from the upstream to the downstream of the river. Calculate a safety width distance Bwt obtained by subtracting the water edge width distance Bw read from the real-time observation video of the river from the levee width distance Bt, and calculate the safety time, which is the time from now until the river floods, based on the safety width distance Bwt and the real-time rainfall in the area near the river, by referring to the pre-prepared dataset. Since the overflow location X is specified based on the calculated safety time, the overflow location X can be specified in real time between the upstream and downstream of the river. Wide-area geographical data is prepared in advance, and based on the geographical data and real-time observation videos of rivers, the presence or absence of river flooding due to rainfall is determined, and the overflow location X from the upstream to the downstream of the river is identified. Therefore, the overflow location X from the upstream to the downstream of the river can be accurately identified in real time. Three-dimensional geographical data including the elevation of the riverbed of a wide-area river is prepared in advance, and based on the relative relationship between the embankment height Vt of the river read from the three-dimensional geographical data at each of a plurality of positions from the upstream to the downstream of the river and the water surface height Vw of the river read from the real-time observation video of the river, the presence or absence of river flooding is determined, and the overflow location X is identified. Therefore, the overflow location X can be identified in real time. Three-dimensional geographical data including the elevation of the riverbed of a wide-area river is prepared in advance. When the relative relationship between the embankment height Vt of the river read from the three-dimensional geographical data at each of a plurality of positions from the upstream to the downstream of the river and the water surface height Vw of the river read from the real-time observation video of the river reaches a predetermined relative relationship, it is determined that there is river flooding, and the embankment location at the position where the predetermined relative relationship is reached is identified as the overflow location X. Therefore, the overflow location X from the upstream to the downstream of the river can be accurately identified in real time. Three-dimensional geographical data including the elevation of the riverbed of a wide-area river is prepared in advance. When the embankment height Vt of the river read from the three-dimensional geographical data and the water surface height Vw of the river read from the real-time observation video of the river match at each of a plurality of positions from the upstream to the downstream of the river, it is determined that there is river flooding, and the embankment location at the position where the embankment height Vt and the water surface height Vw match from the upstream to the downstream of the river is identified as the overflow location X. Prepare three-dimensional geographical data including the elevation of the riverbed of a wide-area river in advance, and calculate the margin height from the upstream to the downstream of the river, which is the height obtained by subtracting the water surface height Vw of the river read from the real-time observation video of the river from the river embankment height Vt read from the three-dimensional geographical data at each of a plurality of positions from the upstream to the downstream of the river. When there is a position where the smallest margin height Vwt from the upstream to the downstream of the river is smaller than the preset height, it is determined that there is a river flood, and the embankment section at the position of the smallest margin height Vwt from the upstream to the downstream of the river is specified as the overflow section X. Prepare three-dimensional geographical data including the elevation of the riverbed of a wide-area river in advance, calculate the margin height Vwt, which is the height obtained by subtracting the water surface height Vw of the river read from the real-time observation video of the river from the river embankment height Vt of the river read from the three-dimensional geographical data at each of a plurality of positions from the upstream to the downstream of the river, calculate the margin time at a plurality of positions based on the margin height Vwt and the real-time rainfall in the area near the river, and specify the overflow section X based on the calculated margin time. Therefore, the overflow section X can be specified in real time. Prepare a dataset that records the correspondence between the combinations of a plurality of margin heights Vwt, which are the heights obtained by subtracting the water surface height Vw of the river from the river embankment height Vt at each of a plurality of positions from the upstream to the downstream of the river, and a plurality of rainfall amounts, and the plurality of margin times from now until the river floods when the rainfall is continuous. Calculate the margin height Vwt, which is the height obtained by subtracting the water surface height Vw of the river read from the real-time observation video of the river from the river embankment height Vt read from the three-dimensional geographical data at each of a plurality of positions from the upstream to the downstream of the river, calculate the margin time at a plurality of positions based on the margin height Vwt and the real-time rainfall with reference to the pre-prepared dataset, and specify the overflow section X based on the calculated margin time. Therefore, the overflow section X can be specified in real time.

[0082] The present invention is not limited to the embodiments described above, and various modifications are possible without departing from the gist of the invention.

Description of Symbols

[0083] t Position of the embankment w Position of the water edge Bt Embankment width distance Bw Water edge width distance H Margin horizontal distance Bwt Margin width distance Vt Embankment height Vw Water surface height Vwt Margin height X Overflow location S Submerged area

Prior Art Documents

Patent Documents

[0084]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

Patent Document 6

Patent Document 7

Claims

1. A river flood prediction method for predicting wide - area river floods during rainfall, comprising: A preparation step of preparation; An overflow location identification step of determining the presence or absence of river floods due to rainfall based on real - time river observation videos, and identifying overflow locations, which are locations where river water overflows the levees between the upstream and downstream of the river; Comprising: Repeatedly executing the overflow location identification step during rainfall; In the overflow location identification step, the relative relationship between the levees provided on both banks of the river and the water edges on both sides of the river read from real - time river observation videos is evaluated at each of a plurality of positions between the upstream and downstream of the river, and based on the relative relationship between the upstream and downstream of the river and the real - time rainfall in the area near the river, the remaining time, which is the time from now until the river floods at a plurality of positions between the upstream and downstream of the river, is calculated, and the overflow locations are identified based on the calculated remaining time. A river flood prediction method characterized by the above.

2. The preparation step prepares a dataset that records the correspondence between a plurality of relative relationship / rainfall combinations, which are combinations of the relative relationship between the levees provided on both banks of the river and the water edges on both sides of the river and a plurality of rainfall amounts at each of a plurality of positions between the upstream and downstream of the river, and a plurality of remaining times, which are the times from now until the river floods when the rainfall is continuous; In the overflow location identification step, the relative relationship between the levees provided on both banks of the river and the water edges on both sides of the river read from real - time river observation videos is evaluated at each of a plurality of positions between the upstream and downstream of the river, and based on the relative relationship between the upstream and downstream of the river and the real - time rainfall in the area near the river, the remaining time, which is the time from now until the river floods at a plurality of positions between the upstream and downstream of the river, is calculated by referring to the pre - prepared dataset, and the overflow locations are identified based on the calculated remaining time. The river flood prediction method according to claim 1, characterized by the above.

3. In the overflow location identification step, when the shortest remaining time among a plurality of remaining times between the upstream and downstream of the river is shorter than a preset time, it is determined that there is a river flood, and the location of the levee at the position with the shortest remaining time between the upstream and downstream of the river is identified as the overflow location. The river flood prediction method according to claim 1 or 2, characterized by the above.

4. Furthermore, An inundation notification step of notifying an electrical communication device of the presence of inundation; Comprising: The flooding notification process notifies that there is flooding in the telecommunications equipment, and the flooding time is the remaining time or the current time plus the remaining time when the flooding occurs. The river flood prediction method according to claim 3, characterized by the above.

5. A river flood prediction method for predicting floods in a wide area during rainfall, comprising: A preparation process for preparation; An overflow location identification process for determining the presence or absence of flooding in the river due to rainfall based on real-time observation videos of the river, and identifying an overflow location where the river water overflows the embankment between the upstream and downstream of the river; A flooded area identification process for identifying a flooded area, which is an area flooded by the water overflowing from the overflow location identified in the overflow location identification process; A flooding notification process for notifying the presence of flooding; Comprising: In the preparation process, an arbitrary position is associated with a telecommunications device in advance; The flooding notification process notifies the telecommunications device associated with the position included in the flooded area that there is flooding and the remaining time, which is the time from now until the river floods, or the flooding time obtained by adding the remaining time to the current time; During rainfall, the overflow location identification process is repeatedly executed. When it is determined in the overflow location identification process that there is flooding in the river due to rainfall, the flooded area identification process and the flooding notification process are executed. The river flood prediction method is characterized by the above.

6. In the preparation process, a plurality of hazard maps, which are map data depicting the flooded area expected when a specific location of a pair of embankments provided on both banks of the river between the upstream and downstream of the river becomes the overflow location, are associated with a plurality of the specific locations of the embankments and prepared; The flooded area identification process identifies the flooded area based on the hazard map associated with the specific location of the embankment that has become the overflow location identified. The river flood prediction method according to claim 5, characterized by the above.

7. In the preparation process, a plurality of hazard maps, which are map data depicting the flooded area expected when a specific location of a pair of embankments provided on both banks of the river between the upstream and downstream of the river becomes the overflow location, are associated with and prepared for each of a plurality of combinations of the rainfall amounts and the specific locations of the embankments, which are combinations of a plurality of the rainfall amounts in the area where the river flows and a plurality of the specific locations of the embankments. The inundation area specifying step specifies the inundation area based on a hazard map associated with a rainfall / dike specific location combination, which is a combination of the real-time rainfall in the area where the river flows and the dike specific location that has become the overflow location specified above. The river flood prediction method according to claim 6, characterized in that.

8. In the preparation step, a plurality of hazard maps, which are map data depicting the inundation area expected when a specific location of a pair of dikes provided on both banks of the river from the upstream to the downstream of the river becomes the overflow location and the inundation height at any position included in the inundation area, are prepared in association with a plurality of rainfall / dike specific location combinations, which are combinations of a plurality of the rainfall amounts and a plurality of the dike specific locations. The inundation area specifying step specifies the inundation area and the inundation height based on a hazard map associated with a rainfall / dike specific location combination, which is a combination of the real-time rainfall in the area where the river flows and the dike specific location that has become the overflow location specified above. The river flood prediction method according to claim 7, characterized in that.

9. A river flood prediction method for predicting river floods over a wide area during rainfall, comprising: A preparation step of preparing; An overflow location specifying step of determining the presence or absence of a river flood due to rainfall based on real-time observation images of the river, and specifying an overflow location, which is a location where the river water overflows the dike between the upstream and downstream of the river; An inundation area specifying step of specifying an inundation area, which is an area inundated by the water overflowing from the overflow location specified in the overflow location specifying step; An inundation notification step of notifying the presence of inundation; Comprising: In the preparation step, an arbitrary position is associated with an electric communication device in advance; In the inundation notification step, the electric communication device associated with the position included in the inundation area is notified of the presence of inundation, the remaining time, which is the time from now until the river floods, or the flood time obtained by adding the remaining time to the current time, and the inundation height at an arbitrary position, which is the inundation height at an arbitrary position associated with the electric communication device; During rainfall, the overflow location specifying step is repeatedly executed, and when it is determined in the overflow location specifying step that there is a river flood due to rainfall, the inundation area specifying step and the inundation notification step are executed. The river flood prediction method, characterized in that.

10. A river flood prediction method for predicting river floods over a wide area during rainfall, comprising: A preparation step of preparing; An overflow location identification step of determining the presence or absence of river flooding due to rainfall based on real-time river observation videos, and identifying overflow locations, which are locations where river water overflows the levees between the upstream and downstream of the river; comprising; repeatedly executing the overflow location identification step during rainfall; wherein the overflow location identification step determines the presence or absence of river flooding based on the relative relationship between the levee width distance, which is the width distance of a pair of levees provided on both banks of the river read from wide-area geographical data including the river prepared in advance at each of a plurality of positions between the upstream and downstream of the river and the pair of levees provided on both banks of the river, and the water-edge width distance, which is the width distance of a pair of water edges of the river read from real-time river observation videos, and identifies the overflow locations; A river flooding prediction method characterized by the above.

11. When the relative relationship between the levee width distance, which is the width distance of a pair of levees provided on both banks of the river at each of a plurality of positions between the upstream and downstream of the river, and the water-edge width distance, which is the width distance of a pair of water edges of the river read from real-time river observation videos, becomes a predetermined relative relationship, the overflow location identification step determines that there is river flooding, and identifies the location of the levee where the relative relationship between the levee width distance and the water-edge width distance between the upstream and downstream of the river becomes the predetermined relative relationship as the overflow location; The river flooding prediction method according to claim 10, characterized by the above.

12. When the levee width distance, which is the width distance of a pair of levees provided on both banks of the river at each of a plurality of positions between the upstream and downstream of the river, and the water-edge width distance, which is the width distance of a pair of water edges of the river read from real-time river observation videos, match, the overflow location identification step determines that there is river flooding, and identifies the location of the levee where the levee width distance and the water-edge width distance match between the upstream and downstream of the river as the overflow location; The river flooding prediction method according to claim 11, characterized by the above.

13. A river flooding prediction method for predicting river flooding in a wide area during rainfall, comprising: A preparation step of preparing; An overflow location identification step of determining the presence or absence of river flooding due to rainfall based on real-time river observation videos, and identifying overflow locations, which are locations where river water overflows the levees between the upstream and downstream of the river; comprising; repeatedly executing the overflow location identification step during rainfall; The margin horizontal distance, which is the horizontal distance between the position of at least one of a pair of levees provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river and the position of the water's edge on the same side as the position of one of the pair of water's edges of the river read from the real-time observation video of the river, is calculated. Based on the margin horizontal distance between the upstream and downstream of the river and the real-time rainfall in the area near the river, the margin time, which is the time from now until the river overflows at a plurality of positions from the upstream to the downstream of the river, is calculated. The overflow location is specified based on the calculated margin time. A river flood prediction method characterized by the above.

14. A river flood prediction method for predicting floods in a wide area during rainfall, comprising: A preparation step of preparing; An overflow location specifying step of determining the presence or absence of a flood in the river due to rainfall based on real-time observation video of the river, and specifying an overflow location, which is a location where the river water overflows the levee, between the upstream and downstream of the river; Comprising; During rainfall, the overflow location specifying step is repeatedly executed. The preparation step prepares a dataset recording the correspondence between a plurality of margin horizontal distance / rainfall combinations, which are combinations of a plurality of margin horizontal distances (each of which is the horizontal distance between the position of at least one of a pair of levees provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river and the position of the water's edge on the same side as the position of one of the pair of water's edges of the river) and a plurality of rainfall amounts, and a plurality of margin times (which are the times from now until the river overflows when the rainfall is continuous). The overflow location specifying step calculates the margin horizontal distance, which is the horizontal distance between the position of at least one of a pair of levees provided on both banks of the river at each of a plurality of positions from the upstream to the downstream of the river and the position of the water's edge on the same side as the position of one of the pair of water's edges of the river read from the real-time observation video of the river. Based on the margin horizontal distance between the upstream and downstream of the river and the real-time rainfall in the area near the river, the margin time, which is the time from now until the river overflows at a plurality of positions from the upstream to the downstream of the river, is calculated by referring to the pre-prepared dataset. The overflow location is specified based on the calculated margin time. A river flood prediction method characterized by the above.

15. A river flood prediction method for predicting floods in a wide area during rainfall, comprising: A preparation step of preparing; An overflow location identification step of determining the presence or absence of river flooding due to rainfall based on real-time river observation videos and identifying overflow locations, which are locations where river water overflows the levees between the upstream and downstream of the river; comprising; repeatedly executing the overflow location identification step during rainfall; the overflow location identification step calculates a margin width distance by subtracting the water-edge width distance of the river, which is read from the real-time river observation video, from the levee width distance, which is the width distance of a pair of levees provided on both banks of the river at each of a plurality of positions between the upstream and downstream of the river, calculates a margin time, which is the time from now until the river floods at a plurality of positions between the upstream and downstream of the river, based on the margin width distance between the upstream and downstream of the river and the real-time rainfall in the area near the river, and identifies the overflow location based on the calculated margin time; A river flooding prediction method characterized by the above.

16. A river flooding prediction method for predicting river flooding over a wide area during rainfall, comprising: a preparation step of preparing; an overflow location identification step of determining the presence or absence of river flooding due to rainfall based on real-time river observation videos and identifying overflow locations, which are locations where river water overflows the levees between the upstream and downstream of the river; comprising; repeatedly executing the overflow location identification step during rainfall; the preparation step prepares a dataset recording the correspondence between a plurality of margin width distance / rainfall combinations, which are combinations of a plurality of margin width distances obtained by subtracting the water-edge width distance of the river from the levee width distance, which is the width distance of a pair of levees provided on both banks of the river at each of a plurality of positions between the upstream and downstream of the river, and a plurality of rainfall amounts, and a plurality of margin times, which are the times from now until the river floods when the rainfall is continuous; the overflow location identification step calculates a margin width distance by subtracting the water-edge width distance of the river, which is read from the real-time river observation video, from the levee width distance, which is the width distance of a pair of levees provided on both banks of the river at each of a plurality of positions between the upstream and downstream of the river, calculates a margin time, which is the time from now until the river floods at a plurality of positions between the upstream and downstream of the river, by referring to the pre-prepared dataset based on the margin width distance between the upstream and downstream of the river and the real-time rainfall in the area near the river, and identifies the overflow location based on the calculated margin time; A river flood prediction method characterized by the following.

17. A river flood prediction method for predicting river floods over a wide area during rainfall, including a preparation step of preparing, a flood location identification step of determining the presence or absence of river flooding due to rainfall based on real-time river observation videos, and identifying flood locations where the river water overflows the river embankments from the upstream to the downstream of the river, and repeatedly executing the flood location identification step during rainfall, wherein the preparation step prepares wide-area three-dimensional geographical data including a pair of embankments provided in advance on both banks of the river and the river, the three-dimensional geographical data includes the elevation of the riverbed of the river, and the flood location identification step determines the presence or absence of river flooding based on the relative relationship between the embankment height of the river read from the three-dimensional geographical data at each of a plurality of positions from the upstream to the downstream of the river and the water surface height of the river read from real-time river observation videos, and identifies flood locations. A river flood prediction method characterized by the following.

18. A river flood prediction method for predicting river floods over a wide area during rainfall, including a preparation step of preparing, a flood location identification step of determining the presence or absence of river flooding due to rainfall based on real-time river observation videos, and identifying flood locations where the river water overflows the river embankments from the upstream to the downstream of the river, and repeatedly executing the flood location identification step during rainfall, wherein the preparation step prepares wide-area three-dimensional geographical data including a pair of embankments provided in advance on both banks of the river and the river, the three-dimensional geographical data includes the elevation of the riverbed of the river, and when the relative relationship between the embankment height of the river read from the three-dimensional geographical data at each of a plurality of positions from the upstream to the downstream of the river and the water surface height of the river read from real-time river observation videos reaches a predetermined relative relationship, it is determined that there is river flooding, and the embankment locations at the positions where the relative relationship between the embankment height and the water surface height from the upstream to the downstream of the river reaches the predetermined relative relationship are identified as flood locations. A river flood prediction method characterized by the following.

19. A river flood prediction method for predicting river floods over a wide area during rainfall, including a preparation step of preparing, a flood location identification step of determining the presence or absence of river flooding due to rainfall based on real-time river observation videos, and identifying flood locations where the river water overflows the river embankments from the upstream to the downstream of the river, and During rainfall, the overflow location identification process is repeatedly executed, The preparation process prepares wide-area three-dimensional geographical data including a pair of dikes provided in advance on a river and both banks of the river, The three-dimensional geographical data includes the elevation of the riverbed of the river, In the overflow location identification process, when the height of the river dike read from the three-dimensional geographical data at each of a plurality of positions from the upstream to the downstream of the river is equal to the water surface height of the river read from the real-time observation video of the river, it is determined that there is a river flood, and the location of the dike where the dike height and the water surface height match from the upstream to the downstream of the river is identified as the overflow location, A river flood prediction method characterized by the above.

20. A river flood prediction method for predicting a river flood in a wide area during rainfall, A preparation process for preparation, An overflow location identification process for determining the presence or absence of a river flood due to rainfall based on a real-time observation video of the river, and identifying an overflow location where the river water overflows the dike of the river from the upstream to the downstream of the river, Comprising, During rainfall, the overflow location identification process is repeatedly executed, The preparation process prepares wide-area three-dimensional geographical data including a pair of dikes provided in advance on a river and both banks of the river, The three-dimensional geographical data includes the elevation of the riverbed of the river, In the overflow location identification process, a margin height is calculated, which is the height obtained by subtracting the water surface height of the river read from the real-time observation video of the river from the dike height of the river read from the three-dimensional geographical data at each of a plurality of positions from the upstream to the downstream of the river. When there is a position where the smallest margin height from the upstream to the downstream of the river is smaller than a preset set height, it is determined that there is a river flood, and the location of the dike at the position of the smallest margin height from the upstream to the downstream of the river is identified as the overflow location, A river flood prediction method characterized by the above.

21. A river flood prediction method for predicting a river flood in a wide area during rainfall, A preparation process for preparation, An overflow location identification process for determining the presence or absence of a river flood due to rainfall based on a real-time observation video of the river, and identifying an overflow location where the river water overflows the dike of the river from the upstream to the downstream of the river, Comprising, During rainfall, the overflow location identification process is repeatedly executed, The preparation process prepares wide-area three-dimensional geographical data including a pair of dikes provided in advance on a river and both banks of the river, The three-dimensional geographical data includes the elevation of the riverbed of the river, The overflow location identification process calculates the margin height, which is the height obtained by subtracting the water surface height of the river read from the real-time observation video of the river from the levee height of the river read from the three-dimensional geographical data at each of a plurality of positions from the upstream to the downstream of the river. Based on the margin height between the upstream and downstream of the river and the real-time rainfall in the area near the river, the margin time, which is the time from now until the river floods at a plurality of positions from the upstream to the downstream of the river, is calculated. The overflow location is identified based on the calculated margin time. A river flood prediction method characterized by the above.

22. A river flood prediction method for predicting river floods over a wide area during rainfall, including a preparation process for preparation, an overflow location identification process for determining the presence or absence of river flooding due to rainfall based on real-time observation video of the river, and identifying the overflow location, which is the location where the river water overflows the levee between the upstream and downstream of the river, and comprising: repeatedly executing the overflow location identification process during rainfall, wherein the preparation process prepares three-dimensional geographical data of a wide area including a river and a pair of levees provided on both banks of the river in advance, the three-dimensional geographical data includes the elevation of the riverbed of the river, and the preparation process prepares a data set recording the correspondence between a plurality of margin height / rainfall combinations, which are combinations of a plurality of margin heights (the height obtained by subtracting the water surface height of the river from the levee height of the river at each of a plurality of positions from the upstream to the downstream of the river) and a plurality of rainfall amounts, and a plurality of margin times (the time from now until the river floods when the rainfall is continuous from the upstream to the downstream of the river) at a plurality of positions from the upstream to the downstream of the river, the overflow location identification process calculates the margin height, which is the height obtained by subtracting the water surface height of the river read from the real-time observation video of the river from the levee height of the river read from the three-dimensional geographical data at each of a plurality of positions from the upstream to the downstream of the river, calculates the margin time, which is the time from now until the river floods at a plurality of positions from the upstream to the downstream of the river, based on the margin height between the upstream and downstream of the river and the real-time rainfall in the area near the river, by referring to the previously prepared data set, and identifies the overflow location based on the calculated margin time. A river flood prediction method characterized by the above.

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