Water volume prediction system, water volume prediction method and program

Abstract

To provide a technique for predicting water quantities of a water channel and a flooded region and displaying the water quantities on a map while reducing a burden on input work of a user.SOLUTION: A water quantity prediction system (1) includes: a map information storage unit (10) for storing electronic map information including map information; a data acquisition unit (20) for acquiring data for hydraulic analysis including water channel network information of an open water channel; a hydraulic analysis unit (30) for deriving water quantity data in the open water channel and a flooded region connected to the open water channel by hydraulic analysis, using the map information and the data for hydraulic analysis; and an output unit (40) for outputting the water quantity data in addition to the map information.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a water volume prediction system, a water volume prediction method, and a program. [Background technology]

[0002] Visualization of analysis results by mathematical models linked with geographic information, as typified by weather charts and hazard maps, is utilized in a wide range of fields to support decision-making. For example, Patent Document 1 discloses an agricultural water pipe network analysis system that can automatically calculate the area of ​​paddy fields or the area of ​​puddling, making it easy to analyze agricultural water pipe networks. In addition, in the field of agricultural and rural engineering, multiple pieces of software that link hydraulic analysis models with geographic information systems have been developed in recent years, mainly for disaster prevention purposes. For example, Non-Patent Document 1 discloses a system that uses deep learning and physical models to predict water levels in drainage channels and agricultural land during rainfall in real time and displays them on a map. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-256262 A [Non-patent literature]

[0004] [Non-Patent Document 1] Yasuchi et al., Water and Earth Knowledge, 89(1), p11-14(2021) Summary of the Invention [Problem to be solved by the invention]

[0005] However, the technology disclosed in Patent Document 1 requires users to scan a map and trace the scanned map data with a mouse to obtain geographic information such as the area of ​​paddy fields and the length of waterways, and the input of such geographic information places a heavy burden on users. The technology disclosed in Non-Patent Document 1 also has the same problem.

[0006] In view of the above problems, one aspect of the present invention aims to provide a technology that predicts the water volume of waterways and flooded areas and displays it on a map while reducing the burden of input work on the user. [Means for solving the problem]

[0007] In order to solve the above problems, a water volume prediction system according to one embodiment of the present invention comprises a map information storage unit that stores electronic map information including location information, a data acquisition unit that acquires hydraulic analysis data including channel network information of an open channel, a hydraulic analysis unit that uses the map information and the hydraulic analysis data to derive water volume data in the open channel and flooded areas connected to the open channel by hydraulic analysis, and an output unit that outputs the water volume data in addition to the map information.

[0008] In order to solve the above problems, a water volume prediction method according to one embodiment of the present invention includes the steps of storing electronic map information including location information, acquiring hydraulic analysis data including channel network information of an open channel, deriving water volume data in the open channel and flooded areas connected to the open channel by hydraulic analysis using the map information and the hydraulic analysis data, and outputting the water volume data in addition to the map information.

[0009] The water volume prediction system according to each aspect of the present invention may be realized by a computer. In this case, the water volume prediction program that causes a computer to operate as each part (software element) of the water volume prediction system, thereby realizing the water volume prediction system in a computer, and the computer-readable non-transitory recording medium on which it is recorded, also fall within the scope of the present invention. Effect of the Invention

[0010] According to one aspect of the present invention, the water volume of waterways and flooded areas can be predicted and displayed on a map while reducing the burden of input work on the user. [Brief description of the drawings]

[0011] [Figure 1] 1 is a block diagram showing a configuration of a water volume prediction system according to an embodiment of the present invention. [Diagram 2] 3 is a flowchart showing a flow of a water volume prediction method according to the embodiment. [Diagram 3] 13 is an example of an electronic map stored in a map information storage unit being displayed on a display. [Figure 4] This is a diagram in which a user has drawn a waterway network on the electronic map shown in Figure 3. [Diagram 5] FIG. 11 is a diagram illustrating an example of a method in which a data acquisition unit acquires connection information. [Figure 6] This is a part of the mesh file created by the data acquisition unit. [Figure 7] 13 is an example of a hydraulic analysis result transmitted from the hydraulic analysis unit to the output unit. [Figure 8] This is an example of the hydraulic analysis results shown in Figure 7 being displayed on a screen using the nodal shapefile created by the output unit. [Figure 9] 13 is another example of a hydraulic analysis result transmitted from the hydraulic analysis unit to the output unit. [Figure 10] This is an example of the hydraulic analysis results shown in Figure 9 being displayed on a screen using the water depth data file for a paddy field created by the output unit. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] [Embodiment 1] An embodiment of the present invention will be described in detail below. Fig. 1 is a block diagram showing the configuration of a water volume prediction system 1 according to the first embodiment of the present invention. The water volume prediction system 1 is a system that calculates water volume data in an open channel and a flooded area connected to the open channel based on input data, and creates and outputs display data that displays the results.

[0013] In this embodiment, an open channel is a channel with an open water surface. A channel with an open water surface is a channel in which the flowing water surface is in contact with atmospheric pressure, unlike a pipe channel in which the water flows inside a pipe. The open channel in this embodiment is mainly an agricultural irrigation channel, but is not limited to this, and also includes rivers, drainage channels, etc. In addition, in this embodiment, a flooded area means an area where water is expected to accumulate. The flooded area is mainly a rice paddy field to which water is supplied from an agricultural irrigation channel, but is not limited to this, and also includes reservoirs, flood control ponds, and reservoirs. Note that in the following embodiments, since an open channel is the subject, an "open channel" may be simply referred to as a "channel."

[0014] (Configuration of water volume prediction system) 1, the water quantity prediction system 1 includes a map information storage unit 10, a data acquisition unit 20, a hydraulic analysis unit 30, an output unit 40, and a control unit 50. A display 60 displays the display data output by the output unit 40.

[0015] The map information storage unit 10 stores electronic map information including location information. The electronic map information is map information that can be processed by a computer, and is, for example, map information that can be acquired from a public domain geographic information system (Geographic Information System, GIS). The electronic map information can be acquired, for example, from a geographic information system published by the Geospatial Information Authority of Japan. The use of electronic map information makes it easier to create data for hydraulic analysis in open channels and flooded areas, and reduces the burden on users.

[0016] Electronic map information is general map data (hereinafter also referred to as "electronic map") that describes rivers, rice paddies, farms, forests, buildings, residential areas, roads, etc., and various geographical information is embedded as electronic data that is not displayed on the screen. It is preferable that the map information is configured so that when a certain range is specified, the area of ​​that range is calculated. Furthermore, the location information includes at least latitude and longitude data, and altitude data.

[0017] The map information storage unit 10 stores, as an example, map information downloaded by the user from the website of the Geospatial Information Authority of Japan. The electronic map information published by the Geospatial Information Authority of Japan includes latitude and longitude, but may not include elevation data within the waterway. In such cases, the user inputs elevation data of the required locations and stores it in the map information storage unit 10.

[0018] The data acquisition unit 20 acquires hydraulic analysis data including channel network information of open channels, and records it in the map information storage unit 10 or other memory. Channel network information is channel layout information. Specifically, it is layout information from the start point to the end point of the channel. Water for a channel is taken from a reservoir, river, main channel, etc., and branches out, and is finally supplied to a flooded area, that is, a rice field or another reservoir, etc., or another channel, etc. This water intake point is the start point, and the final supply point or dead end is the end point. For a branched channel, the branch point is the start point, and the final supply point or dead end is the end point. The method by which the data acquisition unit 20 acquires channel network information will be described later.

[0019] Hydraulic analysis data is data for hydraulic analysis. Hydraulic analysis is the analysis of water flow using a computer, more specifically, the analysis of the flow rate, water depth (water level), etc. at a given position in a waterway and their changes over time. Hydraulic analysis also refers to the analysis of the amount of water inflow (supply) from a waterway in a flooded area, water depth, etc. and their changes over time.

[0020] Examples of hydraulic analysis data for an open channel include the above-mentioned channel network information, as well as the positions where hydraulic analysis is performed (hereinafter referred to as "nodes"), the interval between nodes, the channel dimensions at the nodes (channel width, channel wall height), the channel bed elevation at the nodes, the presence or absence of a weir and its height, the presence or absence of a gate and its height, Manning roughness, the area and elevation of the flooded area, etc. A weir is a partition whose height can be adjusted to adjust the water level. A gate is a partition whose opening can be adjusted between fully closed and fully open. The presence or absence of a weir and its height, the presence or absence of a gate and its opening degree, etc. are set based on the actual situation. The amount of water flowing from the channel to the flooded area is calculated assuming that water flows in from an opening of, for example, a rectangular or circular shape. The area of ​​the opening is set based on the actual situation. In addition, the user sets predetermined initial conditions such as the amount of water intake at the start point of the channel, or boundary conditions such as the end point of the channel, as hydraulic analysis data, as necessary. However, the hydraulic analysis data used in the calculations does not need to include all of these.

[0021] The hydraulic analysis data for the flooded area includes, for example, the area of ​​the flooded area and the area of ​​an opening at a connection point between the waterway and the flooded area. The area of ​​the opening is used to calculate the amount of water flowing from the waterway to the flooded area, as described above.

[0022] The user inputs hydraulic analysis data that is not included in the map information acquired from the geographic information system to the water volume prediction system 1. The user may directly input the necessary data via a keyboard or the like, or may transmit pre-created digital data to the water volume prediction system 1 via a communication device. The data acquisition unit 20 acquires the data entered by the user and records it in the map information storage unit 10 or another memory.

[0023] The hydraulic analysis unit 30 uses the map information stored in the map information storage unit 10 and the hydraulic analysis data acquired by the data acquisition unit 20 to derive water volume data in the open channel and the flooded area connected to the open channel through hydraulic analysis. The hydraulic analysis data is as described above. The water volume data is data related to the flow of water in the channel and the accumulation of water in the flooded area. Specifically, the derived water volume data includes the water flow rate, water level, water depth, flow velocity, etc. at the nodes of the open channel and changes therein. The water volume data also includes the amount of water supplied from the channel in the flooded area, water depth, etc. and changes therein.

[0024] The output unit 40 outputs the water volume data derived by the hydraulic analysis unit 30 in addition to the map information. As an example, the output unit 40 creates output data in which part or all of the water flow rate, flow velocity, water level, and water depth at the nodes of the waterway are superimposed on the map information, and outputs the output data to the display 60. The map information in the output data may be only an electronic map. The output unit 40 creates output data in which the waterway network and water volume data of flooded areas are superimposed on the electronic map.

[0025] The method by which the output unit 40 displays the water flow rate, flow velocity, water level, or water depth superimposed on the map information may be, for example, to display the flow rate value of the node near the node, or to display the mark indicating the node in a color-coded manner according to the water flow rate, flow velocity, water level, or water depth. As another example, the output unit 40 creates output data in which the water depth of the flooded area or the amount of water supplied from the waterway, among the water volume data, is superimposed on the map information and outputs the data to the outside. The method by which the output unit 40 displays the water depth or amount of water supplied of the flooded area superimposed on the map information may be, for example, to display the water depth value or amount of water supplied of the area near the flooded area, or to display the range indicating the flooded area in a color-coded manner according to the water depth or amount of water supplied.

[0026] The control unit 50 comprehensively controls the water quantity prediction system 1. As the control unit 50, various processors such as an MPU (Micro Processing Unit), a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), or a PLD (Programmable Logic Device) can be used.

[0027] The display 60 receives and displays the water volume data added to the map information output by the output unit 40. In FIG. 1, the display 60 is configured as a separate entity from the water volume prediction system 1 and is connected to be able to communicate information, but the display 60 may be configured as being incorporated into the water volume prediction system 1. For example, the water volume prediction system 1 may be configured as a personal computer equipped with the display 60.

[0028] The map information storage unit 10, data acquisition unit 20, hydraulic analysis unit 30, output unit 40, and control unit 50 described above do not need to be integrally configured, and at least one of them may be located separately so as to be able to communicate information. For example, these units may be distributed and located on multiple computers. Also, at least one of them may be located on the cloud.

[0029] In the water volume prediction system 1 having the above configuration, the hydraulic analysis unit 30 derives water volume data in the open channel and the flooded area connected to the open channel through hydraulic analysis using the location information contained in the electronic map information recorded by the map information storage unit 10 and the hydraulic analysis data acquired by the data acquisition unit 20. Furthermore, the output unit 40 outputs the derived water volume data in addition to the map information. Therefore, the water volume prediction system 1 can predict the water volume of the water channel and the flooded area and display it on the map while reducing the input work burden on the user.

[0030] (Water volume forecast method) Next, a water volume prediction method S1 executed by the water volume prediction system 1 will be described. FIG. 2 is a flow chart showing the flow of the water volume prediction method S1 according to the embodiment. The water volume prediction method S1 includes steps S11 to S14. First, in step S11, the map information storage unit 10 stores electronic map information including location information. In step S12, the data acquisition unit 20 acquires hydraulic analysis data including channel network information of the open channel input by the user. In step S13, the hydraulic analysis unit 30 derives water volume data in the open channel and the flooded area connected to the open channel by hydraulic analysis using the map information and the hydraulic analysis data. In step S14, the output unit 40 outputs the water volume data in addition to the map information.

[0031] According to the above water volume prediction method S1, similar to the effects described for the water volume prediction system 1, it is possible to predict the water volumes of waterways and flooded areas and display them on a map while reducing the burden of input work on the user.

[0032] (Waterway network information and waterway connection information) Next, an embodiment in which the data acquisition unit 20 generates waterway connection information will be described. The connection information includes position information of branching points when a waterway branches. The connection information also includes information on which waterway branches from which waterway, and information on which flooded area water is supplied from which waterway. For example, the connection information includes position information of the branching point of an open waterway, an identification number of the connected waterway, and an identification number of the flooded area to which the open waterway is connected.

[0033] The data acquisition unit 20 first acquires waterway network information. As described above, the waterway network information is position information of the waterway network, and is input by the user by overlaying it on the map information displayed on the display 60. A method for the user to input waterway network information will be described later. The data acquisition unit 20 assists the user in inputting operations. The data acquisition unit 20 also acquires the waterway network information input by the user, and generates connection information of open channels in the acquired waterway network using the position information. The data acquisition unit 20 generates connection information of open channels in the waterway network, eliminating the need for the user to create the connection information himself, thereby reducing the burden on the user. The connection information generated by the data acquisition unit 20 will be described later in detail.

[0034] First, a method for a user to input waterway network information will be described. The user causes map information (electronic map) recorded in the map information storage unit 10 to be displayed on the display 60. Fig. 3 shows an example of an electronic map recorded in the map information storage unit 10, displayed on the display 60. An actual electronic map is described in more detail, but Fig. 3 shows an outline of the map.

[0035] Next, the user enters the waterway network on the electronic map by clicking and dragging the mouse. It is not necessary for the waterways to be drawn on the electronic map. Figure 4 shows the waterway network entered by the user on the electronic map shown in Figure 3. The user enters the waterways by dragging the pointer on the electronic map to trace the locations where the waterways actually exist. The range in which the waterway network is entered can be the range in which the water volume data is to be analyzed. For example, if you want to analyze changes in the water depth of a rice paddy, you can enter the waterway network from the starting point of the waterway that supplies water to the rice paddy you want to analyze to the supply point.

[0036] When filling in the waterway network, it is not necessary to faithfully trace the waterways arranged in a curved line, and it is also possible to connect them with broken lines. The broken line route indicated by the white square 1 on the right side of Figure 4 is the main waterway 1 with waterway number 1. The black circles 1a, 1b, ... 1i on this waterway 1 are the points that the user traced and clicked. For example, when the mouse is clicked once, the waterway entry starts with that point as the starting point, and when the pointer is moved and clicked on the way, the waterway route to that point is entered in a straight line. Then, when the pointer is moved again and clicked again, the waterway route from the previous clicked point to the current clicked point is entered in a straight line. Repeat this process until the end point is reached, for example, by clicking the done button to finish entry. Note that the start point and end point of waterway 1 are not shown.

[0037] When inputting a branched waterway, the user inputs the start point of the branched waterway by placing the pointer on the expected branching point and clicking. Waterway 2, indicated by waterway number 2 in Fig. 4, is the waterway that the user expects to branch off from waterway 1 at black circle 2a, which is the start point. Waterway 2 then changes direction at black circle 2b, and continues to the end point (not shown) via black circle 2c.

[0038] Channel 3 is a channel from black circle 3a, which the user assumes to be a branching point from channel 2, to end point 3b. Similarly, channel 4 is a channel from branching point 4a, which the user assumes, to end point 4b. Channel 6 is a channel from branching point 6a, which the user assumes, to end point 6b. The same applies to channels 8, 10, 12, and 14.

[0039] The user repeats this input operation to input the waterway network information. When input of all waterways is completed, the user saves the input waterway network information. Note that the input of the waterway network is not limited to a mouse, and any input device such as a general-purpose input pen or a device dedicated to inputting waterway networks can be used.

[0040] Next, the user instructs the generation of connection information. For example, the user clicks on a connection information generation button. The data acquisition unit 20 acquires information, for example, that the waterway 2 branches from the waterway 1 at the branch point 2a from the data input as shown in FIG. 4. Specifically, the data acquisition unit 20 searches for whether or not other waterways exist within a certain distance from the starting point of each waterway, and if another waterway is found, it determines that the starting point is connected to that waterway. At this time, if no other waterway is found within the certain distance, the data acquisition unit 20 determines that the starting point is not a branch point. Alternatively, if multiple other waterways are found within the certain distance, the data acquisition unit 20 determines that the starting point is connected to the waterway that is closest among them. In this way, the data acquisition unit 20 can generate waterway connection information as expected by the user.

[0041] For example, as shown in FIG. 5, suppose that a search is performed within a certain distance from point 2a, and two waterways, waterway 1 and waterway 3, are found. Here, waterway 1 is closer to point 2a than waterway 3. Therefore, in this example, point 2a is determined to be a branch point and connected to waterway 1. The certain distance may be set in advance, or may be set arbitrarily by the user. Furthermore, the data acquisition unit 20 acquires information including the latitude, longitude, and altitude of the branch point 2a from the stored position information, generates it as connection information between waterways 1 and 2, and records it in the map information storage unit 10 or another memory.

[0042] Similarly, the data acquisition unit 20 generates connection information between the waterways 2 and 3, including information that the waterway 3 branches off from the waterway 2 at the branch point 3a, and information including the latitude, longitude, and altitude of the branch point 3a, and records this information in the map information storage unit 10 or another memory. Thereafter, the data acquisition unit 20 generates and records all connection information. If a dam or the like is installed at the branch point, the user inputs the dam height before the mathematical analysis. If an openable / closable gate is installed at the branch point, the user inputs the open / closed state of the gate as a boundary condition.

[0043] The connection information may include connection information between a waterway and a flooded area. The connection information between a waterway and a flooded area includes the dimensions (width, height, etc.) of the inlet from the waterway into the flooded area. The connection information between a waterway and a flooded area may include the position of the inlet. Based on this connection information, the amount of water flowing from the waterway into the flooded area is calculated. The connection information may also include connection information between a flooded area and another flooded area. For example, it may include the dimensions (width, weir height, etc.) of an inlet weir when water flows from one rice paddy to another rice paddy.

[0044] For example, the user clicks a button to generate the above-mentioned "connection information between waterways and flooded areas." The data acquisition unit 20 then acquires the position information of a representative point for each flooded area listed on the electronic map. The data acquisition unit 20 then searches for the waterway closest to the representative point and determines that the waterway and the flooded area are connected. The above-mentioned "representative point for each area" may specifically be, for example, the centroid of each flooded area (the point where the weight is balanced when one flooded area is considered as a homogenous plate), but is not limited to this.

[0045] As described above, according to this embodiment, at least the connection information of the branch points is generated by the data acquisition unit 20. Therefore, the user only needs to specify the branch points of the waterway on the electronic map displayed on the display 60. In other words, the user does not need to newly input boundary conditions for each branch point in the hydraulic analysis. This further reduces the burden on the user.

[0046] (hydraulic analysis) Next, an example of hydraulic analysis performed by the hydraulic analysis unit 30 will be described. First, the data acquisition unit 20 creates input data for the hydraulic analysis unit 30 to perform hydraulic analysis using the generated connection information and the acquired hydraulic analysis data. The hydraulic analysis data includes the distance between nodes set by the user. The data acquisition unit 20 creates a data table (mesh file) of nodes for each waterway based on the connection information. Next, the data acquisition unit 20 writes the waterway width, waterway bed elevation, and waterway wall height of each node into a mesh file. The mesh file is an input data file for input to the hydraulic analysis unit 30, and is created in CSV (Comma Separated Value) format in this embodiment. However, the format of the data file is not limited to the CSV format. Furthermore, based on the information of the weir or gate set by the user, the data acquisition unit 20 writes the data of the weir or gate into the mesh file.

[0047] FIG. 6 is a part of a mesh file created by the data acquisition unit 20. The contents of the data written in the mesh file illustrated in FIG. 6 are as follows. From the left, "serial number" is the total number of nodes (calculation points), "channel number" is the number assigned to each channel, "node number" is the number assigned to the node in each channel, "x coordinate" is the distance from the starting point (unit is m), and "dx" is the distance between nodes (unit is m). "Manning roughness" is an index showing the resistance of the channel to the water flow, and the larger the value, the greater the resistance. "Channel width", "channel bed elevation", and "channel wall height" are as described respectively. "Connection destination presence or absence (part 1)" indicates the presence or absence of a branch destination or supply destination (hereinafter referred to as "connection destination"), and is represented by 0 if there is no connection destination, and 1 or 2 if there is a connection destination. "Connection destination diameter or width (part 1)" is the size of the diameter (when simulated as a circle) or width (when simulated as a rectangle) of the inlet to the connection destination. "1" is used because there may be two or more connection destinations, in which case the second connection destination is written in the "2" column (not shown) in the data frame of the same name. "Connection destination waterway (1)" is the waterway number of the connection destination. If the connection destination is a flooded area, a number indicating the flooded area is assigned. When a flooded area is specified, the hydraulic analysis unit 30 derives the water depth, etc. from the area and inflow of the flooded area. "Connection destination node (1)" is the node number of the connection destination waterway.

[0048] Next, the data acquisition unit 20 transmits the created mesh file to the hydraulic analysis unit 30. The hydraulic analysis unit 30 acquires the mesh file in a predetermined data format from the data acquisition unit 20, reads the data described in the mesh file, and performs hydraulic analysis of the water volume data in each waterway and each flooded area. Specifically, as an example, for each waterway, a one-dimensional shallow water flow equation is used, which is a combination of the law of conservation of mass between nodes (Equation (1) below) and the equation of motion of water (Equation (2) below).

[0049]

number

number

[0050] Here, t is time, x is distance along the channel, Q is flow rate, A is cross-sectional area, q is lateral inflow per unit width, g is gravitational acceleration, gI1 is hydrostatic pressure acting on the cross-sectional area, gI2 is the component of hydrostatic pressure acting on the side of the channel in the flow direction, Sf is friction gradient, and S is channel bed gradient. I1, I2, and Sf are calculated using the following formulas (3) to (5), respectively.

[0051]

number

number

number

[0052] Then, the spatial direction is calculated using the first-order upwind difference method, and the time direction is calculated using the explicit method. However, the calculation methods are not limited to these. Also, for each flooded area, the balance of water volume flowing in and out of the area is calculated to calculate the change in water depth over time. The hydraulic analysis unit 30 then creates an analysis result file (water volume data) in a specified data format and sends it to the output unit 40.

[0053] Incidentally, by unifying the data format of the input data file that the data acquisition unit 20 creates and sends to the hydraulic analysis unit 30, and the data format of the analysis result file that the hydraulic analysis unit 30 creates and sends to the output unit 40, for example, into CSV format, the exchange and handling of data between each unit can be facilitated. Even if a hydraulic analysis unit 30 of a different program is used, the input data file created by the data acquisition unit 20 can be used as long as it is a program that can handle data files in CSV format.

[0054] FIG. 7 is an example of hydraulic analysis results sent by the hydraulic analysis unit 30 to the output unit 40. Table 601 at the top of FIG. 7 shows the node numbers of the calculated water channels, and table 602 at the bottom of FIG. 7 displays the changes in water flow rate at the nodes shown in table 601. The "overall node number" in table 601 is a serial number assigned to the nodes of all water channels. The "water channel number" is an identification number for each water channel. The "intra-water channel node number" is a node number assigned to each water channel. Table 601 shows seven nodes 1 to 7 of water channel 1, and the serial numbers of all the nodes are also 1 to 7.

[0055] Table 602 displays some of the data written into the hydraulic analysis results. The data displayed is as follows: Starting from the left in the top row, "days," "hours," "minutes," and "seconds" indicate the time elapsed since the start of the analysis. The numbers to the right of these indicate the distance (m) from node number 1 (starting point) of the waterway. The second row indicates the initial conditions at the start of the analysis. In the example shown in table 602, the initial flow rate is 1 (m 3 / s). The third line and onwards show the analysis results for each elapsed time. In the example shown in Figure 7, the analysis results are displayed for every 10 minutes. In other words, the third line shows the analysis results after 10 minutes, and the fourth line shows the analysis results after 20 minutes.

[0056] FIG. 9 is another example of hydraulic analysis results transmitted by the hydraulic analysis unit 30 to the output unit 40. In FIG. 9, the change in water depth of the flooded area (paddy field) is displayed. The top line of FIG. 9 displays the area of ​​each section. From the left of the second line, "day," "hour," "minute," and "second" indicate the elapsed time from the start of the analysis. To the right of that, the section number of the paddy field (an example of an identification number of the flooded area) is displayed. The third line indicates the initial condition at the start of the analysis. In the example shown in FIG. 9, the initial water depth is 0.1 (m) in sections 1 to 7. The fourth line and onward show the analysis results for each elapsed time. In the example shown in FIG. 9, the analysis results for each 10 minutes are displayed. That is, the fourth line shows the analysis results after 10 minutes, and the fifth line shows the analysis results after 20 minutes.

[0057] (Output of hydraulic analysis results) When the output unit 40 receives the analysis results shown in Fig. 7 from the hydraulic analysis unit 30, it creates output information by adding the analysis results to the map information. As an example, the output unit 40 creates a node shapefile that illustrates the positions of nodes on an electronic map. The node shapefile is a file that shows the positions of nodes on an electronic map. The node shapefile is used to output the analysis results of waterways.

[0058] FIG. 8 is an example of outputting hydraulic analysis results using a node shapefile created by the output unit 40. In the node shapefile illustrated in FIG. 8, the position of node 701 is represented by a circle on an electronic map. Node 701 indicates a midpoint of a waterway, a branch point, or a supply point from a waterway to a rice field. The circle of node 701 is color-coded according to the water flow rate. This water flow rate is the water flow rate at a certain point in time among the hydraulic analysis results that change over time. The user can select which point in time of the hydraulic analysis results to display. By color-coding the water flow rate, the user can visually understand the difference in flow rate depending on the position of the waterway and time. The method of displaying the water flow rate is arbitrary, and for example, the water flow rate may be displayed as a digital value. Alternatively, the digital value of the water flow rate may be displayed by placing a cursor on the circle of node 701.

[0059] 9 from the hydraulic analysis unit 30, the output unit 40 creates output information that adds the analysis results to the map information. As an example, the output unit 40 creates a water depth data file in which the water depth of paddy fields is color-coded.

[0060] FIG. 10 is an example of a paddy field water depth data file (paddy field shapefile) created by the output unit 40. In the example shown in FIG. 10, each of the color-coded sections 901 corresponds to one paddy field. Each section 901 of the paddy field on the electronic map is displayed in a different color according to its water depth. The section 901 is created by dividing the paddy field area written on the electronic map by a polygon, by the user. If paddy fields are not displayed on the electronic map one by one, the user creates each section 901 by dividing the paddy field area on one page of the electronic map by a polygon. The displayed water depth is the water depth at a certain point in time among the hydraulic analysis results that change over time. By coloring the water depth, the user can visually understand the difference in water depth for each paddy field. The method of displaying the water depth is arbitrary, and for example, the water depth may be displayed as a digital value. Alternatively, the digital value of the water depth may be displayed when the cursor is placed on the paddy field section 901.

[0061] The output unit 40 outputs the created node shapefile, water depth data file, etc. to the display 60. As a result, the water volume data shown in Fig. 8 and Fig. 10 are displayed on the display 60. By displaying the water volume data in different colors, for example, it is possible to visually classify (visualize) the differences in the water volume data for each location. This allows the user to visually understand the water volume data.

[0062] 〔summary〕 The water volume prediction system of this embodiment comprises a map information memory unit that stores electronic map information including location information, a data acquisition unit that acquires hydraulic analysis data including channel network information of an open channel, a hydraulic analysis unit that uses the map information and the hydraulic analysis data to derive water volume data in the open channel and the flooded area connected to the open channel by hydraulic analysis, and an output unit that outputs the water volume data in addition to the map information.

[0063] With this configuration, electronic map information including location information can be utilized, reducing the burden of input work on the user while providing a system that predicts the water volume in waterways and flooded areas and displays it on a map.

[0064] In addition, in the water volume prediction system of this embodiment, the waterway network information is a waterway network input by a user and overlaid on the map information displayed on a display, and the data acquisition unit may use the location information to generate connection information of the open channels in the acquired waterway network.

[0065] With this configuration, the user inputs waterway network information overlaid on the map information displayed on the display, and the data acquisition unit generates open channel connection information, thereby further reducing the burden of input work on the user.

[0066] In addition, in the water volume prediction system of this embodiment, the connection information may include position information of the branching point of the branched open channel and an identification number of the connected channel, and an identification number of the flooded area to which the open channel is connected.

[0067] With this configuration, the burden on the user to create input data for hydraulic analysis can be reduced.

[0068] In addition, in the water volume prediction system of this embodiment, the hydraulic analysis data for the open channel may include the spacing between nodes which are positions where the hydraulic analysis is performed, the channel width at the nodes, the channel bed elevation, Manning roughness, the presence or absence of a weir and its height, and the presence or absence of a gate and its opening degree.

[0069] With this configuration, the hydraulic analysis unit can analyze water volume data for an open channel using a minimum amount of input data.

[0070] In addition, in the water volume prediction system according to this embodiment, the water volume data may include water flow rate, flow velocity, water level and water depth at the node.

[0071] With this configuration, the hydraulic analysis unit can derive the most important water quantity data, namely, water flow rate, flow velocity, water level and water depth at the nodes.

[0072] In addition, in the water volume prediction system of this embodiment, the hydraulic analysis data regarding the flooded area may include the area of ​​the flooded area and the opening area at the connection point between the open channel and the flooded area.

[0073] With this configuration, the hydraulic analysis unit can analyze water volume data for flooded areas using a minimum amount of input data.

[0074] In addition, in the water volume prediction system according to this embodiment, the water volume data may include the water depth in the flooded area and the amount of water supplied from the open channel.

[0075] With this configuration, the hydraulic analysis unit can derive the most important water volume data, namely, the water depth in the flooded area and the water supply volume from the open channel.

[0076] In addition, in the water volume prediction system according to this embodiment, the output unit may display the nodes in different colors depending on the water flow rate, the flow velocity, the water level, or the water depth.

[0077] With this configuration, the user can visually recognize the water flow rate, flow velocity, water level, or water depth data of the node.

[0078] In addition, in the water volume prediction system according to this embodiment, the output unit may display the flooded area in a different color depending on the water depth or the amount of water supplied.

[0079] With this configuration, the user can visually recognize data on the water depth or water supply volume of the flooded area.

[0080] In addition, in the water volume prediction system of this embodiment, the hydraulic analysis unit may acquire hydraulic analysis data in a predetermined data format from the data acquisition unit, and transmit the analysis results in the predetermined data format to the output unit.

[0081] With this configuration, hydraulic analysis data can be created using a data format that can be processed by the hydraulic analysis unit, making it possible to apply the data to various types of hydraulic analysis models.

[0082] The water volume prediction method according to this embodiment includes the steps of storing electronic map information including location information, acquiring hydraulic analysis data including channel network information of an open channel, deriving water volume data in the open channel and in flooded areas connected to the open channel by hydraulic analysis using the map information and the hydraulic analysis data, and outputting the water volume data in addition to the map information.

[0083] With this configuration, electronic map information including location information can be used, reducing the burden of input work on the user while providing a method for predicting the water volume in waterways and flooded areas and displaying it on a map.

[0084] The water volume prediction program of this embodiment causes a computer to execute a map information storage process that stores electronic map information including location information, a data acquisition process that acquires hydraulic analysis data including channel network information of an open channel, a hydraulic analysis process that uses the map information and the hydraulic analysis data to derive water volume data in the open channel and flooded areas connected to the open channel by hydraulic analysis, and an output process that outputs the water volume data in addition to the map information.

[0085] With this configuration, electronic map information including location information can be utilized, reducing the burden of input work on the user while providing a program that predicts the water volume in waterways and flooded areas and displays it on a map.

[0086] [Additional Notes] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. [Explanation of symbols]

[0087] 1. Water volume prediction system 10 Map information storage unit 20 Data Acquisition Section 30 Hydraulic Analysis Department 40 Output section 50 Control section 60 Display

Claims

1. a map information storage unit that stores electronic map information including location information; A data acquisition unit that acquires hydraulic analysis data including waterway network information of irrigation channels and drainage channels; a hydraulic analysis unit that uses the map information and the hydraulic analysis data to derive water volume data for the irrigation canals and drainage canals and flooded areas connected to the irrigation canals and drainage canals through hydraulic analysis; an output unit that outputs the water volume data in addition to the map information; Equipped with The waterway network information is a waterway network input by a user and superimposed on the map information displayed on a display. Water volume prediction system.

2. A water volume prediction system as described in Claim 1, wherein the data acquisition unit uses the location information to generate connection information of the irrigation canals and drainage canals in the acquired waterway network.

3. The water volume prediction system of claim 2, wherein the connection information includes location information of the branching points of the branched irrigation canals and drainage canals, an identification number of the connected canal, and an identification number of the flooded area to which the irrigation canals and drainage canals are connected.

4. The hydraulic analysis data for the irrigation canals and drainage channels includes the spacing between nodes which are positions where the hydraulic analysis is performed, the channel width at the nodes, the channel bed elevation, Manning roughness, the presence or absence of a dam and its height, and the presence or absence of a gate and its opening degree. A water volume prediction system as described in any one of claims 1 to 3.

5. The water quantity prediction system according to claim 4 , wherein the water quantity data includes a water flow rate, a flow velocity, a water level and a water depth at the node.

6. The water volume prediction system according to any one of claims 1 to 5, wherein the hydraulic analysis data relating to the flooded area includes an area of ​​the flooded area and an opening area at a connection point between the irrigation canal and drainage canal and the flooded area.

7. The water quantity prediction system according to claim 6 , wherein the water quantity data includes a water depth in the flooded area and an amount of water supplied from the irrigation canal.

8. The water volume prediction system according to claim 5 , wherein the output unit displays the nodes in different colors depending on the water flow rate, the flow velocity, the water level, or the water depth.

9. The water volume prediction system according to claim 7 , wherein the output unit displays the flooded area in a different color depending on the water depth or the amount of supplied water.

10. 9. The water volume prediction system according to claim 1, wherein the hydraulic analysis unit acquires hydraulic analysis data in a predetermined data format from the data acquisition unit, and transmits analysis results in the predetermined data format to the output unit.

11. storing electronic map information including location information; A step of acquiring hydraulic analysis data including waterway network information of irrigation canals and drainage canals; deriving water volume data for the irrigation canal and drainage canal and flooded areas connected to the irrigation canal and drainage canal through hydraulic analysis using the map information and the hydraulic analysis data; outputting the water volume data in addition to the map information; Including, The waterway network information is a waterway network input by a user and superimposed on the map information displayed on a display. Water volume prediction methods.

12. On the computer, a map information storage process for storing electronic map information including location information; A data acquisition process for acquiring data for hydraulic analysis including waterway network information of irrigation canals and drainage canals; A hydraulic analysis process for deriving water volume data in the irrigation canals and drainage canals and in flooded areas connected to the irrigation canals and drainage canals by hydraulic analysis using the map information and the hydraulic analysis data; an output process of outputting the water volume data in addition to the map information; A program for executing The waterway network information is a waterway network input by a user and superimposed on the map information displayed on a display. program.

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