Flood response system and its control method

Abstract

To identify, in real time, an inundation range when a flood disaster occurs in a state where an actual condition including a temporal change of the inundation at a time point of determination is reflected while reducing a facility cost.SOLUTION: A system coping with a flood disaster comprises a storage section K6 for storing areas predicted to be inundated for each predetermined time from the point of time when a dike brake occurs at a dike break point for each one of the dike break points assumed along a river dike as a plurality of different predicted areas before inundation occurrence for each predetermined time. The system also comprises: a plurality of pieces of inundation detection means Wk for detecting an inundation at different places of the predicted areas before the inundation occurrence; and an inundation occurrence area derivation section K3 for deriving a high-accuracy inundation occurrence areas being the areas with a high possibility of the inundation occurrence at the present time point as flood disaster information based on the detection results of the inundation detection means Wk at the present time point and the predicted areas before inundation occurrence.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a flood response system for coping with floods including inundation, and a control method thereof.

Background Art

[0002] Recently, as global meteorological phenomena caused by the increase in the concentration of greenhouse gases in the atmosphere, local warming and local cooling due to the generation and movement of the polar vortex have occurred. In particular, due to the rise in seawater temperature accompanying local warming, the moisture contained in the atmosphere increases and the local rainfall increases, and floods accompanied by river flooding may occur. In view of such a situation, for example, a flood control support system is known in which a hazard map of a river basin is created in advance based on rainfall intensity information, and various flood control supports are performed using the created hazard map (see Patent Document 1). Here, the hazard map is one in which the hazard level indicating the flood risk of each area is visualized on the map of the target area.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above flood control support system, since flood control support is performed based on a pre-created hazard map, for example, if the breach point of a river embankment is known, there is an advantage that the flood occurrence prediction area can be immediately predicted according to the hazard map. On the other hand, in the hazard map, since the maximum range of normal inundation is set, there is a problem that it is difficult to grasp the actual inundation situation accurately. In addition, as another method for grasping the inundation range, there is a method of grasping the inundation range from aerial photographs. Although this method has the merit of being able to specify the actual inundation range in real time, there is a problem that when meteorological conditions such as strong winds are frequent at the time of inundation occurrence, an aerial photograph cannot be obtained because an aircraft for acquiring the photograph cannot fly, and thus the inundation range cannot be grasped. In addition, there is a problem in terms of time that it currently takes at least several hours from acquiring an aerial photograph taken by an aircraft to analyzing the photograph to specify the inundation range. In addition, there is also a method of visually checking the site using a drone or the like. However, since the information is fragmentary, it is difficult to specify the inundation range, and since the site check is to be performed after ensuring the safety of the site, there is a problem that the immediacy of grasping the inundation range immediately after the inundation occurs is low.

[0005] The present invention has been made in view of the above-described problems, and an object thereof is to provide a flood countermeasure system and a control method thereof that can specify in real time the inundation range at the time of a flood, including the temporal change of the inundation, in a state that more reflects the actual state at the determination time while reducing equipment costs.

Means for Solving the Problems

[0006] A flood countermeasure system for achieving the above object is a flood countermeasure system for coping with floods including inundation, and its characteristic configuration is as follows: For each assumed levee breach point along a river levee, a storage unit is provided that stores, for each predetermined time from the time when a levee breach occurs at the levee breach point, the area predicted to be inundated as a plurality of different pre-predicted inundation occurrence areas for each predetermined time. Based on the detection results at the current time of a plurality of inundation detection means provided at different locations within the pre-predicted inundation occurrence area and for detecting the inundation, and the plurality of pre-predicted inundation occurrence areas, an inundation occurrence area derivation unit is provided that derives a high-accuracy inundation occurrence area as flood information as an area where the inundation is highly likely to be occurring at the current time.

[0007] A control method for a flood response system for achieving the above object is a control method for a flood response system that responds to floods including inundation, and its characteristic configuration is as follows: In a configuration including a storage unit that stores, for each assumed breach point along a river levee, the area predicted to be inundated at each predetermined time from the time when a breach occurs at the breach point as a plurality of different pre-predicted inundation occurrence areas at each predetermined time, Based on the current detection results of a plurality of inundation detection means provided at different locations within the pre-predicted inundation occurrence area and that detect the inundation, and the plurality of pre-predicted inundation occurrence areas, a high-accuracy inundation occurrence area is derived as flood information as the area where inundation is highly likely to be occurring at the current time by executing an inundation occurrence area derivation step.

[0008] According to the above characteristic configuration, first, since the area predicted to be inundated at each predetermined time from the time when a breach occurs at the breach point is used as a plurality of different pre-predicted inundation occurrence areas at each predetermined time, the inundation area that changes over time is stored in advance as a plurality of pre-predicted inundation occurrence areas. That is, each of the plurality of pre-predicted inundation occurrence areas stores, in order from the closest to the breach point, the areas where inundation occurs at relatively early stages to the areas where inundation occurs at late stages, including the time from the breach time to the inundation, in a state including the time from the breach time to the inundation, in the storage unit. However, since the pre-predicted inundation occurrence area is set on the safe side under the most severe conditions of the breach situation and rainfall situation at the breach point, it is often a different area from the inundation area based on the actual breach situation and rainfall situation. Therefore, in the above characteristic configuration, a plurality of inundation detection means are provided and the detection results of the presence or absence of inundation by the inundation detection means are used. Thereby, in specifying the inundation occurrence area, the presence or absence of inundation at the installation position of the inundation detection means can be reflected in real time. However, in order to specify the inundation range only based on the detection results of the presence or absence of inundation by such inundation detection means, it is necessary to set a large number of inundation detection means in the area where inundation is predicted, resulting in a large equipment cost. According to the above characteristic configuration, the flooding occurrence area derivation unit derives a high-probability flooding occurrence area as flood disaster information, as an area where flooding is highly likely to be occurring at the current time, based on the detection results of a plurality of flooding detection means at the current time and a plurality of pre-predicted flooding occurrence areas. For example, for a pre-predicted flooding occurrence area where a flooding detection means that has detected flooding is installed, assuming that flooding is highly likely to occur throughout the entire area, by deriving it as a high-probability flooding occurrence area, the flooding range can be specified in real time in a state that more reflects the actual situation at the determination time, such as the temporal change of flooding. Moreover, since the high-probability flooding occurrence area is derived based not only on the detection results of the flooding detection means but also on the information of the pre-predicted flooding occurrence areas, the flooding range can be derived in a state where it spreads to the surrounding area without being limited only to the installation location of the flooding detection means. Thus, it is possible to reduce the equipment cost without excessively increasing the number of installed flooding detection means. From the above, it is possible to provide a flood disaster response system and its control method that can specify in real time the flooding range at the time of a flood disaster in a state that more reflects the actual situation at the determination time including the temporal change of flooding while reducing the equipment cost.

[0009] A further characteristic configuration of the flood disaster response system is the flooding occurrence area derivation unit derives, as the high-probability flooding occurrence area, an area that includes at least one or more points where the flooding is detected by the flooding detection means among the plurality of pre-predicted flooding occurrence areas at the current time.

[0010] As in the above characteristic configuration, by deriving, as a high-probability flooding occurrence area, an area that includes at least one or more points where flooding is detected by the flooding detection means among the plurality of pre-predicted flooding occurrence areas at the current time, while suppressing the number of installed flooding detection means and reducing the equipment cost, in a relatively wide range, the flooding range can be specified in real time in a state that more reflects the actual situation at the determination time including the temporal change of flooding.

[0011] A further characteristic configuration of the flood disaster response system is The memory unit stores, for each of the plurality of different predicted inundation occurrence areas stored for each levee breach point, the predicted time from the point in time when the levee breach occurred to the point in time when inundation is predicted to occur in the predicted inundation occurrence area. When the inundation occurrence area derivation unit derives at least one of the plurality of predicted inundation occurrence areas corresponding to one levee breach point as the high-accuracy inundation occurrence area, it also derives, as the high-accuracy inundation occurrence area, the predicted inundation occurrence area associated with a predicted time shorter than the predicted time associated with the derived high-accuracy inundation occurrence area.

[0012] According to the above characteristic configuration, it is not always necessary to provide inundation detection means for all of the predicted inundation occurrence areas. Therefore, a more economical system can be realized while maintaining the reliability of the derived high-accuracy inundation occurrence area at a certain level or higher.

[0013] A further characteristic configuration of the flood damage countermeasure system is that the memory unit stores the elevation of the predicted inundation occurrence area for each location, the inundation detection means is configured to be able to detect the inundation water level, which is the height from the ground surface to the water surface at the location where it is provided, it includes a sea level reference inundation water level derivation unit that derives a sea level reference inundation water level based on the mean sea level from the inundation water level detected by the inundation detection means and the elevation of the location where the inundation detection means for detecting the inundation water level is provided, among the plurality of predicted inundation occurrence areas, it includes an inundation water level derivation unit that derives the inundation water level at each location in the high-accuracy inundation occurrence area as the flood damage information from the sea level reference inundation water level derived from the detection result of the inundation detection means included in the area derived as the high-accuracy inundation occurrence area and the elevation of each location in the high-accuracy inundation occurrence area.

[0014] According to the above characteristic configuration, the inundation water level derivation unit derives, as flood damage information, the inundation water level at each point in the high-accuracy inundation occurrence area from the sea-level reference inundation water level derived by the inundation detection means included in the area derived as the high-accuracy inundation occurrence area and the elevation of each point in the high-accuracy inundation occurrence area. Therefore, not only information on whether the high-accuracy inundation occurrence area is inundated but also the degree of the inundation water level in the high-accuracy inundation occurrence area can be derived, and flood damage information reflecting the actual situation can be provided.

[0015] A further characteristic configuration of the flood damage response system is When the sea-level reference inundation water level derived from the detection results of the plurality of inundation detection means provided in the area derived as the high-accuracy inundation occurrence area among the plurality of inundation occurrence pre-prediction areas is different for each of the plurality of inundation detection means, the inundation water level derivation unit Derives the inundation water level at each point in the high-accuracy inundation occurrence area using the largest sea-level reference inundation water level or the average value of the sea-level reference inundation water levels for each high-accuracy inundation occurrence area.

[0016] As in the above characteristic configuration, by the inundation water level derivation unit deriving the inundation water level at each point in the high-accuracy inundation occurrence area using the largest sea-level reference inundation water level for each high-accuracy inundation occurrence area, the inundation water level can be presented on the safer side, and early response at the time of flood damage can be promoted. Also, by the inundation water level derivation unit deriving the inundation water level at each point in the high-accuracy inundation occurrence area using the average value of the sea-level reference inundation water levels for each high-accuracy inundation occurrence area, an inundation water level in accordance with the actual situation of inundation in the high-accuracy inundation occurrence area can be provided. Note that the elevation of each point in the high-accuracy inundation occurrence area and points other than each point in the high-accuracy inundation occurrence area where the water level sensor is provided are also included.

[0017] A further characteristic configuration of the flood damage response system is It includes a weather information acquisition unit that acquires weather information related to the weather in the determination area including the inundation occurrence pre-prediction area. When the weather information acquired by the weather information acquisition unit is information indicating that there is a possibility of a levee breach occurring in the future, a communication line connection unit is provided to establish a connection of a communication line for the inundation occurrence area derivation unit to receive detection results from a plurality of the inundation detection means.

[0018] Normally, after a flood disaster such as inundation occurs, the communication line becomes congested, and there may be problems such that the inundation occurrence area derivation unit cannot receive the detection results from the inundation detection means. According to the above-described characteristic configuration, when the weather information acquired by the weather information acquisition unit is information indicating that there is a possibility of a levee breach occurring in the future (for example, heavy rain flood warning, etc.), the communication line connection unit establishes a connection of a communication line for the inundation occurrence area derivation unit to receive detection results from a plurality of the inundation detection means. Therefore, before a flood disaster such as inundation occurs and the communication line becomes congested, the connection of the communication line can be surely established, and at the time of a flood disaster, the communication of flood disaster information can be stably performed.

[0019] It is preferable that the flood disaster countermeasure system described so far is provided with a notification processing unit that notifies the external of the flood disaster information when the flood disaster information is derived.

[0020] A further characteristic configuration of the flood disaster countermeasure system is When the inundation occurrence area derivation unit derives the high-precision inundation occurrence area, a remote operation unit is provided to stop gas facilities that control the supply gas pressure in the gas pipeline network included in the high-precision inundation occurrence area and remotely shut off a shut-off valve that shuts off the gas pipeline network included in the high-precision inundation occurrence area.

[0021] For example, when the gas facility is a pressure regulating device having an auxiliary ball valve that controls the supply gas pressure to the secondary side of the gas pipeline network, when it is submerged, the supply gas pressure to the secondary side rises to the primary pressure, and there is a risk of abnormal gas ejection at the gas usage location. According to the above characteristic configuration, when a high-accuracy flooding occurrence area is derived, when the remote operation unit derives the high-accuracy flooding occurrence area, the gas facility that controls the supply gas pressure in the gas pipeline network included in the high-accuracy flooding occurrence area is stopped, and the shut-off valve that shuts off the gas pipeline network included in the high-accuracy flooding occurrence area is remotely shut off. Therefore, the occurrence of abnormal gas ejection at the gas usage location can be prevented in advance. Incidentally, for gas facilities and shut-off valves that cannot be remotely operated, the person in charge of management who can learn the situation from the notification from the above-described notification processing unit will go to the site to stop the gas facility and shut off the gas pipeline network with the shut-off valve. In addition, the shut-off valve shall include not only those included in the above high-accuracy flooding occurrence area but also upstream shut-off valves provided in the gas pipeline network on the upstream side of the gas pipeline network provided in the high-accuracy flooding occurrence area.

Brief Description of the Drawings

[0022]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0023] The flood damage response system 100 and its control method according to an embodiment of the present invention relate to a system that can identify, in real time, the inundation range at the time of a flood while reducing equipment costs, in a state that more accurately reflects the actual situation at the time of determination, including the temporal change of the inundation. Hereinafter, based on FIGS. 1 to 5, the flood damage response system 100 according to the embodiment will be described.

[0024] The flood damage response system 100 according to the embodiment includes a monitoring center K realized in a form in which hardware and software cooperate. The monitoring center K is configured to be able to receive the measurement results of a plurality of water level sensors W1, W2... Wk (k is an integer of k≥2; an example of inundation detection means) connected to the monitoring center K via a network line N. Further, the water level sensor Wk is configured to be able to detect the inundation water level, which is the height from the ground surface to the water surface at the provided location.

[0025] For each assumed levee breach point P (shown in FIG. 2) along the levee of the river R (shown in FIG. 2), the monitoring center K stores, as a plurality of different pre-inundation occurrence prediction areas S (S1 to S4 in FIG. 2(a)), the areas predicted to be inundated at each predetermined time from the time when a levee breach occurs at the breach point P, at each predetermined time. The monitoring center K also includes an inundation occurrence area derivation unit K3 that derives, as flood damage information, a high-probability inundation occurrence area HS (shown in FIG. 2), which is an area where inundation is highly likely to occur at the current time, based on the detection results of the plurality of water level sensors Wk in the current pre-inundation occurrence prediction area S and the plurality of pre-inundation occurrence prediction areas S.

[0026] The storage unit K6 stores, as a so-called hazard map, for each of the plurality of different pre-inundation occurrence prediction areas S stored for each breach point P, the prediction time from the time when a levee breach occurs to the time when inundation is predicted to occur in the pre-inundation occurrence prediction area S. That is, usually, it is stored in a form associated with a shorter prediction time for the pre-inundation occurrence prediction area S that is closer to the breach point P in terms of distance. For example, as shown in FIG. 2, when the first to fourth pre-flood occurrence prediction regions S1 to S4 exist adjacent to each other in the order closest to the levee breach point P, flooding occurs immediately after the levee breach in the first pre-flood occurrence prediction region S1 close to the levee breach point P, flooding occurs about 30 minutes after the levee breach in the second pre-flood occurrence prediction region S2, flooding occurs about 60 minutes after the levee breach in the third pre-flood occurrence prediction region S3, and flooding occurs about 90 minutes after the levee breach in the fourth pre-flood occurrence prediction region S4, etc., and they are stored in the storage unit K6.

[0027] To add an explanation about the flood occurrence region derivation unit K3, the flood occurrence region derivation unit K3 derives, as a high-accuracy flood occurrence region HS, a region that includes at least one point where flooding is detected by the water level sensor Wk among a plurality of pre-flood occurrence prediction regions S. Here, detecting flooding by the water level sensor Wk means that a water level equal to or higher than a preset flood determination water level (for example, 30 cm: the lowest limit value of the hazard map) is detected. Furthermore, for a plurality of pre-flood occurrence prediction regions S corresponding to one levee breach point P, when the flood occurrence region derivation unit K3 derives at least one as a high-accuracy flood occurrence region HS, the flood occurrence region derivation unit K3 also derives, as a high-accuracy flood occurrence region HS, the pre-flood occurrence prediction regions S associated with a prediction time shorter than the prediction time associated with the pre-flood occurrence prediction region S that is the high-accuracy flood occurrence region HS. Taking FIG. 2(a) as an example, for example, in a situation where the water level sensor Wk is provided only in the fourth pre-flood occurrence prediction region S4 and not in the first to third pre-flood occurrence prediction regions S1 to S3, when the flood occurrence region derivation unit K3 derives only the fourth pre-flood occurrence prediction region S4 as the high-accuracy flood occurrence region HS, the flood occurrence region derivation unit K3 also derives, as the high-accuracy flood occurrence region HS, the first to third pre-flood occurrence prediction regions S1 to S3 associated with a prediction time shorter than the prediction time associated with the fourth pre-flood occurrence prediction region S4. Such control is based on the fact that, from the definition of the pre-flood occurrence prediction area S described so far, if flooding has occurred in the fourth pre-flood occurrence prediction area S4, it is highly likely that flooding has also occurred in the first to third pre-flood occurrence prediction areas S1 to S3. Moreover, by providing such control, the water level sensor Wk does not necessarily have to be provided in all of the pre-flood occurrence prediction areas S.

[0028] The plurality of water level sensors Wk are dispersedly provided in the plurality of pre-flood occurrence prediction areas S described above. In this embodiment, as shown in FIG. 3, they are provided adjacent to pressure regulating devices G1, G2 ··· Gm (m is an integer of m ≧ 1), which are gas facilities for controlling the pressure on the secondary side of the gas pipes forming the gas pipe network Pw to a predetermined set pressure. Incidentally, as shown in FIG. 3, in addition to the pressure regulating device Gm, shut-off valves V1, V2 ··· Vn (n is an integer of n ≧ 1) for shutting off the gas pipes are provided in the gas pipes forming the gas pipe network Pw. Although not shown in the figure, the pressure regulating device Gm as a gas facility is supplied with power from the commercial power system, provided with an auxiliary battery, and also provided with a communication device (not shown) that can communicate with the outside via the network line N. The communication device and the water level sensor Wk are normally driven by the power supplied from the commercial power system, and are configured to be driven by the power supplied from the auxiliary battery when the power supply from the commercial power system stops. Incidentally, the auxiliary battery is raised above the ground surface so that power supply is possible even during flooding.

[0029] Here, the flood occurrence area derivation unit K3 of the monitoring center K receives flood information I2 from the water level sensor Wk using the FOMA or LTE line. When a flood occurs, the FOMA or LTE line becomes congested, so there is a possibility that the flood occurrence area derivation unit K3 cannot receive the flood information I2 from the water level sensor Wk. Therefore, in the flood damage response system 100 according to the present embodiment, a weather information acquisition unit K1 is provided that acquires weather information I1 in a determination area including a flood occurrence pre-prediction area S from a weather system KS that holds weather information I1 via a network line N. When the weather information I1 acquired by the weather information acquisition unit K1 is information indicating that a levee breach may occur in the future (for example, information including a heavy rain flood warning in the determination area), a communication line connection unit K2 is provided to establish a connection of a FOMA or LTE line for the flood occurrence area derivation unit K3 to receive detection results from a plurality of water level sensors Wk. When the communication line connection unit K2 establishes a connection, it preferably continues to maintain the connection at least while weather information I1 indicating that a levee breach may occur in the future is being acquired, and preferably while there is a risk of a flood occurring in the determination area, and continues to acquire flood damage information I2 from the water level sensors Wk every predetermined time (for example, every minute).

[0030] Now, when the above-described pressure regulating device G is flooded, the gas pressure on the secondary side of the pressure regulating device G is boosted to a set pressure or higher, and when a gas consumption unit provided for a consumer on the secondary side is used, gas may jet out from the gas consumption unit. Specifically, as shown in FIG. 4, the pressure regulating device G is configured as a Reynolds type gas governor. The pressure regulating device G supplies gas supplied from a primary side gas pipe PB as a constant secondary pressure from a secondary side gas pipe PB via a main governor 8 which is a main unit. The pressure regulating device G is a gas governor that reduces pressure from a so-called medium-low pressure to a low pressure and is used for a district pressure regulator. The main governor 8 has two valve bodies 10, and the valve bodies 10 are connected to a main diaphragm 12 via a diaphragm spindle 11. The secondary pressure is led into a lower chamber 13 of the main diaphragm 12. Furthermore, the pressure regulating device G includes an intermediate pressure auxiliary governor 15 connected to the primary side gas pipe PB of the main governor 8 via a primary pressure regulating pipe 14, a low pressure auxiliary governor 17 connected to the intermediate pressure auxiliary governor 15 via a regulating pipe 16, and an auxiliary driving ball disk 19 connected to the intermediate pressure auxiliary governor 15 via a pipe line 18. The low pressure auxiliary governor 17 is connected to the secondary side of the gas pipe PB via a secondary pressure regulating pipe 20. A needle valve 21 is interposed on the side of the intermediate pressure auxiliary governor 15 from the connection part of the regulating pipe 16 and the pipe line 18. In order to connect the main governor 8 and the auxiliary driving ball disk 19, a lever 22 and a suspension rod 23 are provided, and a weight 24 for opening the main governor 8 is placed on the lever 22 and the suspension rod 23.

[0031] When there is no demand on the secondary side, since the secondary pressure is high, at this time the low pressure auxiliary governor 17 is in a closed state, and the intermediate pressure auxiliary governor 15 is set to an intermediate pressure. This pressure is transmitted via the regulating pipe 16 to the lower chamber 27 of the diaphragm 26 of the auxiliary driving ball disk 19. As a result, the suspension rod 23 and the lever 22 are pushed up, and the two valve bodies 10 of the main governor 8 rise to close the opening 10a.

[0032] When a demand occurs on the secondary side and the secondary pressure drops, the low pressure auxiliary governor 17 operates, and the gas in the chamber 27 of the auxiliary driving ball disk 19 begins to flow to the secondary side. At this time, the intermediate pressure auxiliary governor 15 also starts to operate, but the flow rate is restricted by the throttle of the needle valve 21 between the intermediate pressure auxiliary governor 15 and the auxiliary driving ball disk 19. Therefore, the intermediate pressure in the regulating pipe 16 drops, the diaphragm 26 of the auxiliary driving ball disk 19 descends, the suspension rod 23 and the lever 22 lower, and the main governor 8 opens.

[0033] When the demand decreases and the secondary pressure rises, the low pressure auxiliary governor 17 closes, the intermediate pressure rises, and the main governor 8 closes. The setting of the secondary pressure is adjusted by the number of small weights 17a placed on the low pressure auxiliary governor 17.

[0034] When the pressure regulating device G having the above configuration is flooded, water flows into the upper room of the diaphragm 26 of the auxiliary ball disk 19 through the atmosphere opening hole 19a. Due to the water pressure, the diaphragm 26 descends, the suspension rod 23 and the lever 22 lower, the main governor 8 opens, and there is a risk that the pressure on the secondary side will increase beyond the set pressure.

[0035] Thus, when the pressure regulating device G is flooded and the pressure on the secondary side increases beyond the set pressure, there is a possibility of secondary disasters such as fires occurring at the consumers on the secondary side. Therefore, for the pressure regulating devices G (G1 and G2 in FIG. 3) existing in the high-accuracy flood occurrence area HS derived by the flood occurrence area deriving unit K3, it is preferable that they are stopped and shut off. Therefore, the monitoring center K is provided with a remote operation unit K5 that determines whether or not the pressure regulating device G is located in the high-accuracy flood occurrence area HS derived by the flood occurrence area deriving unit K3. When there is a pressure regulating device G located in the high-accuracy flood occurrence area HS, stop information I4 is transmitted to the pressure regulating device G via the network line N for remote stop. Furthermore, the remote operation unit K5 transmits shut-off information I4 to a shut-off valve that shuts off the gas pipeline network Pw included in the high-accuracy flood occurrence area HS, in other words, to the shut-off valve V1 located in the high-accuracy flood occurrence area HS and to the upstream shut-off valve V2 that shuts off the upstream gas pipeline network Pw of the gas pipeline network Pw included in the high-accuracy flood occurrence area HS for remote shut-off. Here, the monitoring center K is provided with a notification processing unit K4 that displays the flood damage information I3 of the high-accuracy flood occurrence area HS derived by the flood occurrence area deriving unit K3 on a map of a monitor M or transmits it to smartphones or tablet terminals held by workers T1, T2 ··· Te (e is an integer where e ≧ 1) for display on the map. When the high-accuracy flood occurrence area HS is displayed on the map of the smartphone or tablet terminal held by the worker Te, the worker Te executes the stop process of the pressure regulating device G that cannot be remotely operated and the shut-off process of the shut-off valve V1 and the upstream shut-off valve V2.

[0036] Hereinafter, based on the control flows of FIGS. 1, 2, 3, and 5, a flood damage countermeasure control method according to the flood damage countermeasure system 100 of the present embodiment will be described. 〔Control Flow〕 The weather information acquisition unit K1 acquires weather information I1 from the weather system KS at predetermined time intervals (#01). When the acquired weather information I1 is information indicating that there may be a levee breach in the future (for example, information corresponding to a heavy rain flood warning in the determination area, etc.) (Yes in #02), the steps from #03 and subsequent are executed. When the acquired weather information I1 is not information indicating that there may be a levee breach in the future (No in #02), the step of #01 is repeated.

[0037] When the weather information I1 acquired by the weather information acquisition unit K1 is information indicating that there may be a levee breach in the future (Yes in #02), the communication line connection unit K2 establishes a communication line connecting all the water level sensors Wk and the monitoring center K and maintains the connection (#03).

[0038] Next, when the monitoring center K acquires breach information where the breach point P has occurred (Yes in #04), the plurality of pre - flood occurrence prediction areas S (S1 - S4 in FIGS. 2 and 3) corresponding to the breach point P are extracted from the storage unit K6 (#05). On the other hand, when the breach information where the breach point P has occurred has not been acquired (No in #04), the step of #04 is repeated.

[0039] Next, when flooding is detected by the water level sensor Wk in the pre - flood occurrence prediction area S (Yes in #06), the flood occurrence area derivation unit K3 derives a high - accuracy flood occurrence area HS (shown in FIGS. 2(c) and 3) from the detected flood point (the points where the water level sensors W1 and W2 are shown in FIG. 2(b)) among each of the plurality of pre - flood occurrence prediction areas S1 - S4 (an example of the high - accuracy flood occurrence area derivation process) (#07).

[0040] When the high - accuracy flood occurrence area HS is derived, the notification processing unit K4 notifies flood damage information I3 based on the high - accuracy flood occurrence area HS (#08). At the same time, the remote operation unit K5 stops the pressure regulating devices (pressure regulating devices G1 and G2 in FIG. 3) corresponding to the high - accuracy flood occurrence area HS and shuts off the shut - off valve (V1 in FIG. 3) and the upstream shut - off valve (V2 in FIG. 3) based on the flood damage information IS. The stop of the pressure regulating device G and the shut-off of the shut-off valve (V1 in FIG. 3) and the upstream shut-off valve (V2 in FIG. 3) may be configured to perform either one of them. At this time, as shown in FIG. 3, on the map, the pressure regulating devices G3 to G6 that do not overlap with the high-precision flooding occurrence area HS are not stopped, and the shut-off valve V3 on the downstream side of the high-precision flooding occurrence area HS is not shut off.

[0041] 〔Another Embodiment〕 (1) In the above embodiment, the breach point P was acquired, and based on the plurality of pre-flood occurrence prediction areas S corresponding to the breach point P, the high-precision flood occurrence area HS was derived. However, at the time of an actual flood, in some cases, only the area where flooding is occurring with the breach point P unknown is identified through communication from houses and the like in that area. In such a case, the high-precision flood occurrence area HS may be derived based on the pre-flood occurrence prediction area S provided with the water level sensor Wk that detects flooding without acquiring the breach point P.

[0042] (2) In the above embodiment, when the flood occurrence area derivation unit K3 derived at least one of the plurality of pre-flood occurrence prediction areas S corresponding to one breach point P as the high-precision flood occurrence area HS, the pre-flood occurrence prediction areas S associated with a prediction time shorter than the prediction time associated with the pre-flood occurrence prediction area S as the derived high-precision flood occurrence area HS were also derived as the high-precision flood occurrence area HS. However, the flood occurrence area derivation unit K3 may adopt a configuration in which the pre-flood occurrence prediction areas S associated with a prediction time shorter than the prediction time associated with the pre-flood occurrence prediction area S as the derived high-precision flood occurrence area HS are not derived as the high-precision flood occurrence area HS.

[0043] (3) In the above embodiment, the storage unit K6 showed an example in which, as a so-called hazard map, for each of the plurality of different pre-flood occurrence prediction areas S stored for each breach point P, the prediction time from the time when the breach occurred to the time when flooding is predicted to occur over time was associated and stored. However, the memory unit K6 may adopt a configuration that does not store such prediction times. In this case, the flooding occurrence area derivation unit K3 does not derive, as the highly accurate flooding occurrence area HS, a flooding occurrence pre-prediction area S associated with a prediction time shorter than the prediction time associated with the flooding occurrence pre-prediction area S that is the flooding occurrence pre-prediction area derived as the highly accurate flooding occurrence area HS.

[0044] (4) In the above embodiment, the flooding detection means is composed of a water level sensor Wk capable of detecting the flooding water level, which is the height from the ground surface to the water surface at the installed location. As another configuration example of the flooding detection means, it may be a flooding detection sensor that only detects whether the installed location is flooded.

[0045] (5) In the flood damage countermeasure system 100 and its control method of the present invention, the sea level reference flooding water level of the highly accurate flooding occurrence area HS may be derived using the flooding water level detected by the water level sensor Wk. In this case, the water level sensor Wk is configured to be able to detect the flooding water level, which is the height from the ground surface to the water surface at the installed location. Furthermore, the monitoring center K includes a sea level reference flooding water level derivation unit (not shown) that stores the elevation of each flooding occurrence pre-prediction area S in the memory unit K6, and derives the sea level reference flooding water level based on the average sea level from the flooding water level detected by the water level sensor Wk and the elevation of the location where the water level sensor Wk that detected the flooding water level is installed. Among the plurality of flooding occurrence pre-prediction areas S, from the sea level reference flooding water level derived from the detection results of the water level sensors Wk included in the area derived as the highly accurate flooding occurrence area HS and the elevation of each location in the highly accurate flooding occurrence area HS, it includes a flooding water level derivation unit (not shown) that derives the flooding water level at each location in the highly accurate flooding occurrence area HS as flood damage information. Here, when the inundation water level derivation unit derives the sea - level reference inundation water level from the detection results of a plurality of water - level sensors Wk provided in the region derived as the high - probability inundation occurrence region HS among the plurality of pre - prediction regions S of inundation occurrence, and the sea - level reference inundation water levels are different among the plurality of water - level sensors Wk, for each high - probability inundation occurrence region HS, the inundation water level at each point in the high - probability inundation occurrence region HS may be derived using the largest sea - level reference inundation water level or the average value of the sea - level reference inundation water levels.

[0046] When adopting this configuration, as a control method, as shown in FIG. 6, in addition to the control flow of FIG. 5, #07 - a and #07 - b will be executed. That is, in the step of #07 - a, a sea - level reference inundation water level based on the mean sea level is derived from the inundation water level detected by the water - level sensor Wk and the elevation of the point where the water - level sensor Wk that detected the inundation water level is provided by a sea - level reference inundation water level derivation unit (not shown). Furthermore, in the step of #07 - b, the inundation water level derivation unit derives the inundation water level at each point in the high - probability inundation occurrence region HS as flood - disaster information from the sea - level reference inundation water level derived from the detection results of the water - level sensors Wk included in the region derived as the high - probability inundation occurrence region HS among the plurality of pre - prediction regions S of inundation occurrence and the elevation of each point in the high - probability inundation occurrence region HS.

[0047] (6) In the above - described embodiment, when the high - probability inundation occurrence region HS is derived, a configuration example of shutting off the pressure - regulating device G, the shut - off valve V1, and the upstream shut - off valve V2 provided in the gas pipeline network Pw based on the derivation result is shown. As another example, when the high - probability inundation occurrence region HS is derived, the information of the high - probability inundation occurrence region HS itself may be transmitted to other disaster - prevention centers, or may be configured to directly notify the region including the high - probability inundation occurrence region HS by a speaker (not shown) or the like.

[0048] (7) In #04 and #05 of the control flow of the above - described embodiment, control was executed to acquire the levee - breach point P and extract a plurality of pre - prediction regions S corresponding to the levee - breach point P from the storage unit K6. However, the control after #05 may be executed without executing this control. In this case, in the processes after #05, various controls will be executed for all the pre-flood occurrence prediction areas S.

[0049] (8) The flood disaster information such as the high-accuracy flood occurrence area HS derived by the flood disaster response system 100 in the above embodiment can also be used when grasping the magnitude of flood damage and the inner area of flood damage at an early stage in formulating the restoration plan after the stop of the pressure regulating device G and the shut-off of the shut-off valve V1 and the upstream shut-off valve V2. Furthermore, when deriving the flood level as flood disaster information, it can be used not only to grasp the outline of the damage to buildings such as above-floor flooding and below-floor flooding in the high-accuracy flood occurrence area HS, but also to select areas where human and material damage is assumed to be large from the flood depth, etc. when considering the response to rescue and fire-fighting activities.

[0050] In addition, the configurations disclosed in the above embodiment (including other embodiments, the same applies hereinafter) can be applied in combination with the configurations disclosed in other embodiments as long as no contradiction occurs. Also, the embodiments disclosed in this specification are examples, and the embodiments of the present invention are not limited to this, and can be appropriately modified within the scope not departing from the object of the present invention.

Industrial Applicability

[0051] The flood disaster response system of the present invention and its control method can be effectively used as a flood disaster response system and its control method that can specify the flooded area at the time of flood disaster in real time in a state that more reflects the actual situation at the determination time including the temporal change of flooding while reducing the equipment cost.

Explanation of Signs

[0052] 2: Pressure regulating device 100: Flood disaster response system G: Pressure regulating device HS: High-accuracy flood occurrence area I1: Meteorological information K1: Meteorological information acquisition unit K2: Communication line connection unit K3: Flood Generation Area Derivation Unit K4: Notification Processing Unit K5: Remote Operation Unit K6: Memory Unit P: Breach Point PB: Gas Pipe R: River S: Flood Generation Pre - prediction Area S: Flood Generation Pre - prediction Area V: Shut - off Valve W: Water Level Sensor

Claims

1. A flood response system for coping with floods including inundation, comprising: a storage unit that stores, for each assumed levee breach point along a river levee, regions predicted to be inundated at predetermined time intervals from the time when a levee breach occurs at the levee breach point as a plurality of different pre-inundation occurrence prediction regions for each of the predetermined time intervals; a flood occurrence region derivation unit that derives, as flood information, a high-probability flood occurrence region as a region where flooding is highly likely to be occurring at the current time based on detection results at the current time of a plurality of flood detection means provided at different locations within the pre-inundation occurrence prediction regions and the plurality of pre-inundation occurrence prediction regions.

2. The flood response system according to claim 1, wherein the flood occurrence region derivation unit derives, as the high-probability flood occurrence region, a region including at least one or more points where the flooding has been detected by the flood detection means at the current time among the plurality of pre-inundation occurrence prediction regions.

3. The storage unit stores, for each of the plurality of different pre-inundation occurrence prediction regions stored for each levee breach point, a prediction time from the time when the levee breach occurs to the time when flooding is predicted to occur in the pre-inundation occurrence prediction region, and when the flood occurrence region derivation unit derives at least one of the plurality of pre-inundation occurrence prediction regions corresponding to one levee breach point as the high-probability flood occurrence region, the flood response system according to claim 1 or 2, wherein the flood occurrence region derivation unit also derives, as the high-probability flood occurrence region, the pre-inundation occurrence prediction region associated with a prediction time shorter than the prediction time associated with the derived high-probability flood occurrence region.

4. The storage unit stores the elevation of the pre-inundation occurrence prediction region for each point, the flood detection means is configured to be able to detect a flood water level that is the height from the ground surface to the water surface at the location where it is provided, and includes a sea level reference flood water level derivation unit that derives a sea level reference flood water level based on the flood water level detected by the flood detection means and the elevation of the location where the flood detection means for detecting the flood water level is provided. A flood damage response system according to any one of claims 1 to 3, comprising a flood water level derivation unit that derives the flood water level at each point in the high-accuracy flood occurrence area as the flood damage information from the sea level reference flood water level derived from the detection results of the flood detection means included in the area derived as the high-accuracy flood occurrence area among the plurality of pre-flood occurrence prediction areas and the elevation of each point in the high-accuracy flood occurrence area.

5. When the sea level reference flood water level derived from the detection results of the plurality of flood detection means provided in the area derived as the high-accuracy flood occurrence area among the plurality of pre-flood occurrence prediction areas is different for each of the plurality of flood detection means, the flood water level derivation unit The flood damage response system according to claim 4, wherein for each high-accuracy flood occurrence area, the flood water level at each point in the high-accuracy flood occurrence area is derived using the largest sea level reference flood water level or the average value of the sea level reference flood water levels.

6. Comprising a weather information acquisition unit that acquires weather information related to the weather in a determination area including the pre-flood occurrence prediction area, A flood damage response system according to any one of claims 1 to 5, wherein when the weather information acquired by the weather information acquisition unit is information indicating that there is a possibility of the levee break occurring hereafter, a communication line connection unit is provided to establish a connection of a communication line for the flood occurrence area derivation unit to receive detection results from the plurality of flood detection means.

7. The flood damage response system according to any one of claims 1 to 6, further comprising a notification processing unit that notifies the outside of the flood damage information when the flood damage information is derived.

8. When the flood occurrence area derivation unit derives the high-accuracy flood occurrence area, a remote operation unit is provided to stop the gas facilities that control the supply gas pressure in the gas pipeline network included in the high-accuracy flood occurrence area and remotely shut off the shut-off valve that shuts off the gas pipeline network included in the high-accuracy flood occurrence area. The flood damage response system according to any one of claims 1 to 7.

9. A control method for a flood damage response system that responds to flood damage including flooding, In a configuration including a storage unit that stores, for each assumed levee break point along the levee of a river, the area predicted to be flooded at each predetermined time from the time when the levee break occurs at the levee break point as a plurality of different pre-flood occurrence prediction areas at each predetermined time, A control method for executing a flooded area derivation step of deriving, as flood disaster information, a high-probability flooded area as an area where flooding is highly likely to have occurred at the current time, based on the detection results at the current time of flooding detection means provided at a plurality of different locations within the pre-flood occurrence prediction area and capable of detecting the flooding, and the plurality of pre-flood occurrence prediction areas.

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