JP7630827B2 - Water volume prediction system, water volume prediction method and program - Google Patents

Description

The present invention relates to a water volume prediction system, a water volume prediction method, and a program.

Visualization of the results of analysis using mathematical models linked with geographic information, as typified by weather charts and hazard maps, is being used in a wide range of fields to support decision-making. For example, Patent Document 1 discloses an agricultural and water pipe network analysis system that can automatically calculate the area of paddy fields or puddled areas, making it easy to analyze agricultural and 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.

JP 2001-256262 A

Yasuchi et al., Water and Earth Knowledge, 89(1), p11-14(2021)

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 rice paddies and the length of waterways, and the task of inputting such geographic information places a heavy burden on users. The technology disclosed in Non-Patent Document 1 also has the same problem.

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.

To solve the above problems, a water volume prediction system according to one embodiment of the present invention includes 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 in flooded areas connected to the open channel through hydraulic analysis, and an output unit that outputs the water volume data in addition to the map information.

To solve the above problems, a water volume prediction method according to one aspect 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 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.

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 to realize the water volume prediction system on a computer, and the computer-readable non-transitory recording medium on which it is recorded, also fall within the scope of the present invention.

According to one aspect of the present invention, it is possible to predict the water volume of waterways and flooded areas and display it on a map while reducing the burden of input work on the user.

1 is a block diagram showing a configuration of a water volume prediction system according to an embodiment of the present invention. 3 is a flowchart showing a flow of a water volume prediction method according to the embodiment. 13 is an example of an electronic map stored in a map information storage unit being displayed on a display. This is a diagram in which a user has entered a waterway network onto the electronic map shown in Figure 3. FIG. 11 is a diagram illustrating an example of a method in which a data acquisition unit acquires connection information. This is a part of the mesh file created by the data acquisition unit. 13 is an example of a hydraulic analysis result transmitted from the hydraulic analysis unit to the output unit. This is an example of the hydraulic analysis results shown in Figure 7 being displayed on a display using the node shapefile created by the output unit. 13 is another example of a hydraulic analysis result transmitted from the hydraulic analysis unit to the output unit. This is an example of the hydraulic analysis results shown in Figure 9 being displayed on a display using the water depth data file for a paddy field created by the output unit.

[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.

In this embodiment, an open channel is a channel with an open water surface. A channel with an open water surface is a channel where the water surface is exposed to atmospheric pressure, unlike a pipe channel where 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 rice paddies supplied with water from an agricultural irrigation channel, but is not limited to this and also includes reservoirs, flood control ponds, and irrigation ponds. In the following embodiment, since the open channel is the subject, an "open channel" may be simply referred to as a "channel".

(Configuration of water volume prediction system)
1, the water volume 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. The display 60 displays the display data output by the output unit 40.

The map information storage unit 10 stores electronic map information including location information. Electronic map information is map information that can be processed by a computer, and is map information that can be obtained, for example, from a public domain geographic information system (GIS). Electronic map information can be obtained, 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, reducing the burden on users.

Electronic map information is general map data (hereinafter also referred to as "electronic map") that includes rivers, rice paddies, farmland, forests, buildings, residential areas, roads, etc., with various geographical information 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. In addition, the location information includes at least latitude and longitude data, and altitude data.

The map information storage unit 10 stores, as an example, map information downloaded by the user from the Geospatial Information Authority of Japan website. 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 for the required locations and stores it in the map information storage unit 10.

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 before finally being 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.

Hydraulic analysis data is data for hydraulic analysis. Hydraulic analysis involves using a computer to analyze the flow of water, and 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 involves the analysis of the amount of water inflow (supply) from a waterway in a flooded area, water depth, etc. and their changes over time.

Examples of hydraulic analysis data for open channels include the above-mentioned channel network information, as well as the locations where hydraulic analysis is performed (hereinafter referred to as "nodes"), node spacing, channel dimensions at the nodes (channel width, channel wall height), 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, and the area and elevation of the flooded area. 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 that is, for example, rectangular or circular. 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 of the channel, or boundary conditions such as the end 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.

In addition, the hydraulic analysis data for the flooded area includes, for example, the area of the flooded area and the opening area at the connection point between the waterway and the flooded area. As described above, the opening area is used to calculate the amount of water flowing from the waterway into the flooded area.

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 input the necessary data directly 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.

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.

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 some 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 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.

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 is superimposed on the map information, and outputs it 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.

The control unit 50 controls the water volume 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.

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 enable information communication, but the display 60 may be configured as an entity 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.

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 configured as an integrated unit, and at least one of them may be located separately so as to be able to communicate information. For example, each of these units may be located in a distributed manner on multiple computers. Also, at least one of them may be located on the cloud.

In the water volume prediction system 1 having the above configuration, the hydraulic analysis unit 30 uses 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 to derive water volume data in the open channel and the flooded area connected to the open channel through hydraulic analysis. 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.

(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.

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 volume of waterways and flooded areas and display it on a map while reducing the burden of input work on the user.

(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.

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. The method by which the user inputs 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. By the data acquisition unit 20 generating connection information of open channels in the waterway network, the user is no longer required to create the connection information himself, which reduces the burden on the user. The connection information generated by the data acquisition unit 20 will be described later in detail.

First, a method for a user to input waterway network information will be described. The user causes the map information (electronic map) recorded in the map information storage unit 10 to be displayed on the display 60. Figure 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 Figure 3 shows an outline of it.

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 may be the range in which the water volume data is to be analyzed. For example, if one wishes to analyze changes in the water depth of a rice paddy, one may enter the waterway network from the start point of the waterway that supplies water to the rice paddy to be analyzed to the supply point.

When entering a waterway network, it is not necessary to faithfully trace the waterways arranged in a curved line; they may be connected by broken lines. The broken line route indicated by the white square 1 on the right side of Figure 4 is the main waterway 1, which is assigned waterway number 1. The black circles 1a, 1b, ... 1i along this waterway 1 are the points that the user traced and clicked. For example, when the mouse is clicked once initially, the entry of the waterway begins with that point as the starting point, and when the pointer is moved and a click is made along the way, the waterway route up 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. This is repeated until the end point is reached, and entry is terminated by clicking, for example, the done button. Note that the start and end points of waterway 1 are not shown.

When inputting a branched channel, the user inputs the starting point of the branched channel by placing the pointer on the intended branching point and clicking. Channel 2, indicated by channel number 2 in Figure 4, is the channel that the user assumes branches off from Channel 1 at black circle 2a, which is the starting point. Channel 2 then changes direction at black circle 2b and continues via black circle 2c to the end point (not shown).

Channel 3 is a channel that runs 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 that runs from branching point 4a, which the user assumes, to end point 4b. Channel 6 is a channel that runs from branching point 6a, which the user assumes, to end point 6b. The same applies to channels 8, 10, 12, and 14.

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

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

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, of waterways 1 and 3, waterway 1 is closer to point 2a. 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 for waterways 1 and 2, and records it in the map information storage unit 10 or another memory.

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

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.

For example, the user clicks a button that generates the above-mentioned "connection information between waterways and flooded areas." The data acquisition unit 20 then acquires the position information of the 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 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.

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.

(Hydraulic analysis)
Next, an example of hydraulic analysis performed by the hydraulic analysis unit 30 will be described. First, the data acquisition unit 20 uses the generated connection information and the acquired hydraulic analysis data to create input data for the hydraulic analysis unit 30 to perform hydraulic analysis. 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 CSV format. Furthermore, based on the weir or gate information set by the user, the data acquisition unit 20 writes the weir or gate data into the mesh file.

Figure 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 Figure 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 that indicates 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 channel (1)" is the channel 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 channel.

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).

Here, t is time, x is distance along the waterway, 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 waterway cross section, _gI2 is the component of hydrostatic pressure acting on the side of the waterway in the flow direction, Sf is friction gradient, and S is the waterway bed gradient. _I1 , _I2 , and Sf are calculated using the following formulas (3) to (5), respectively.

ここで、ｈは水深、ｚは水路床からの高さ、Ｂは通水断面幅、Ｍはマニング粗度、Ｒは径深である。

Here, h is the water depth, z is the height from the waterway bed, B is the cross-sectional width of the channel, M is the Manning roughness, and R is the radial depth.

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.

In addition, by unifying the data format of the input data file created by the data acquisition unit 20 and sent to the hydraulic analysis unit 30 and the data format of the analysis result file created by the hydraulic analysis unit 30 and sent to the output unit 40 into, for example, 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 the program can handle data files in CSV format.

Figure 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 Figure 7 shows the node numbers of the calculated water channels, and table 602 at the bottom of Figure 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-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 nodes are also 1 to 7.

Table 602 displays part of the data written in the hydraulic analysis results. The displayed data is as follows: 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 indicate the distance (m) from node number 1 (start point) of the waterway. The second row indicates the initial conditions at the start of the analysis. In the example shown in table 602, it is shown that the initial flow rate is 1 (m ³ /s) at nodes 1 to 7. The third row and onwards show the analysis results for each elapsed time. In the example shown in FIG. 7, the analysis results for every 10 minutes are displayed. That is, the third row shows the analysis results after 10 minutes, and the fourth row shows the analysis results after 20 minutes.

Figure 9 is another example of hydraulic analysis results sent by the hydraulic analysis unit 30 to the output unit 40. In Figure 9, the change in water depth of the flooded area (paddy field) is displayed. The top line of Figure 9 displays the area of each section. From the left of the second line, "days," "hours," "minutes," and "seconds" indicate the time elapsed since the start of the analysis. To the right of that, the section number of the paddy field (an example of an identification number for the flooded area) is displayed. The third line shows the initial conditions at the start of the analysis. In the example shown in Figure 9, the initial water depth is 0.1 (m) in sections 1 to 7. The fourth line and onwards show the analysis results for each elapsed time. In the example shown in Figure 9, the analysis results for every 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.

(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 the nodes on an electronic map. The node shapefile is a file that shows the positions of the nodes on an electronic map. The node shapefile is used to output the analysis results of the waterway.

Figure 8 is an example of hydraulic analysis results output using a node shapefile created by the output unit 40. In the node shapefile illustrated in Figure 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 the cursor on the circle of node 701.

When the output unit 40 receives the analysis results shown in FIG. 9 from the hydraulic analysis unit 30, it 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.

Figure 10 is an example of a paddy field water depth data file (paddy field shape file) created by the output unit 40. In the example shown in Figure 10, each of the color-coded sections 901 corresponds to one paddy field. Each paddy field section 901 on the electronic map is displayed in a different color according to its water depth. The sections 901 are created by dividing the paddy field area written on the electronic map by the user using polygons. If paddies 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 polygons. The displayed water depth is the water depth at a certain point in time among the hydraulic analysis results that change over time. By color-coding 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.

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 Figures 8 and 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 water volume data for each location. This allows the user to visually understand the water volume data.

〔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.

This configuration makes it possible to use electronic map information including location information, reducing the burden of input work on the user while providing a system that predicts the water volume of waterways and flooded areas and displays it on a map.

In addition, in the water volume prediction system according to 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.

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. This further reduces the burden of input work on the user.

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

This configuration reduces the burden on users to create input data for hydraulic analysis.

In addition, in the water volume prediction system according to this embodiment, the hydraulic analysis data for the open channel may include the spacing between nodes at which 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.

This configuration allows the hydraulic analysis unit to analyze water volume data for open channels using minimal input data.

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.

With this configuration, the hydraulic analysis unit can derive the most important water volume data: water flow rate, flow velocity, water level, and water depth at nodes.

In addition, in the water volume prediction system according to this embodiment, the hydraulic analysis data for 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.

This configuration allows the hydraulic analysis unit to analyze water volume data for flooded areas using minimal input data.

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.

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 amount of water supplied from the open channel.

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

This configuration allows the user to visually recognize the nodal point's water flow rate, flow velocity, water level or water depth data.

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.

This configuration allows the user to visually recognize data on the water depth or water supply volume of the flooded area.

In addition, in the water volume prediction system according to this embodiment, the hydraulic analysis unit may acquire hydraulic analysis data in a specified data format from the data acquisition unit, and transmit the analysis results in the specified data format to the output unit.

With this configuration, hydraulic analysis data can be created in a data format that the hydraulic analysis unit can process, making it possible to apply the data to various types of hydraulic analysis models.

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.

This configuration allows the use of electronic map information including location information, reducing the burden of input work on the user while providing a method for predicting the water volume of waterways and flooded areas and displaying it on a map.

The water volume prediction program according to 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 in flooded areas connected to the open channel through hydraulic analysis, and an output process that outputs the water volume data in addition to the map information.

This configuration makes it possible to use electronic map information including location information, reducing the burden of input work on the user while providing a program that predicts the water volume of waterways and flooded areas and displays it on a map.

[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.

1 Water volume prediction system 10 Map information storage unit 20 Data acquisition unit 30 Hydraulic analysis unit 40 Output unit 50 Control unit 60 Display

Claims (12)

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. The water quantity prediction system according to claim 1 , wherein the data acquisition unit generates connection information of the irrigation canals and drainage canals in the acquired waterway network using the location information. 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. 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. The water volume prediction system of claim 4, wherein the water volume data includes water flow rate, flow velocity, water level, and water depth at the nodes. 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. 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 . The water volume prediction system according to claim 5, wherein the output unit displays the nodes in different colors according to the water flow rate, the flow velocity, the water level, or the water depth. The water volume prediction system according to claim 7, wherein the output unit displays the flooded area in a different color according to the water depth or the amount of water supplied. The water volume prediction system according to any one of claims 1 to 8, wherein the hydraulic analysis unit acquires hydraulic analysis data in a predetermined data format from the data acquisition unit and transmits the analysis results in the predetermined data format to the output unit. 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 by 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 forecasting methods. 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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