Information processing device and information processing method

Abstract

An information processing device (100) comprises: a position information acquisition unit (111) that acquires position information indicating the positions in the horizontal direction of a water intake point and a paddy field; a total hydraulic head curved surface information acquisition unit (113) that acquires total hydraulic head curved surface information indicating the total hydraulic head curved surface of a region including the water intake point and the paddy field, the total hydraulic head curved surface extending in a first direction along the horizontal direction and in a second direction along the horizontal direction and orthogonal to the first direction; a soil information acquisition unit (116) that acquires soil information related to the attribute of soil in the region; a groundwater path calculation unit (120) that calculates a groundwater path from the paddy field to the water intake point by applying the steepest-descent method to the total hydraulic head curved surface of the region, on the basis of the total hydraulic head curved surface information acquired by the total hydraulic head curved surface information acquisition unit (113); a hydraulic conductivity acquisition unit (121) that acquires the hydraulic conductivity along the path calculated by the groundwater path calculation unit (120), on the basis of the soil information acquired by the soil information acquisition unit (116); and a recharge degree calculation unit (123) that calculates a recharge degree indicating the degree of recharging with water at the paddy field for the water intake point, on the basis of the length of the path calculated by the groundwater path calculation unit (120) and the hydraulic conductivity acquired by the hydraulic conductivity acquisition unit (121).

Description

Information Processing Apparatus and Information Processing Method

[0001] The present disclosure relates to an information processing apparatus and an information processing method.

[0002] Conventionally, an information processing apparatus for identifying important points in carrying out water resource conservation activities in each target area has been disclosed (see, for example, Patent Document 1). This information processing apparatus is configured to divide a predetermined area into a number of meshes, calculate the water balance of each mesh, and output information on the circulation state of water resources for each point in the predetermined area.

[0003] Japanese Unexamined Patent Application Publication No. 2022-117715

[0004] Generally, water resource users who conduct business using water resources are required to balance the amount of water used at the water intake point and the amount of water supplied to the water intake point so that the water resources do not run out. As a method for supplying water to the water intake point, for example, there is a method of supplying groundwater stored by winter flooding of paddy fields to the water intake point. However, the information processing apparatus described in Patent Document 1 has a problem that it is difficult to evaluate the degree to which water in a specific paddy field is stored and supplied to the water intake point.

[0005] The present disclosure has been made based on the recognition of the above problems, and an object thereof is to provide an information processing apparatus and an information processing method capable of evaluating the degree to which water in a paddy field is stored with respect to a water intake point.

[0006] The information processing device according to this disclosure is characterized by comprising: a position information acquisition unit that acquires position information indicating the horizontal position of a water intake point and a paddy field; a total head surface information acquisition unit that acquires total head surface information indicating the total head surface of an area including the water intake point and the paddy field, extending in a first direction along the horizontal direction and a second direction along the horizontal direction and perpendicular to the first direction; a soil information acquisition unit that acquires soil information relating to the attributes of the soil in the area; a groundwater path calculation unit that calculates the path of groundwater from the paddy field to the water intake point by applying the steepest descent method to the total head surface of the area based on the total head surface information acquired by the total head surface information acquisition unit; a permeability acquisition unit that acquires the permeability in the path calculated by the groundwater path calculation unit based on the soil information acquired by the soil information acquisition unit; and a recharge degree calculation unit that calculates the degree to which water from the paddy field recharges the water intake point based on the length of the path calculated by the groundwater path calculation unit and the permeability acquired by the permeability acquisition unit.

[0007] The information processing device relating to this disclosure can evaluate the degree to which water is being replenished in the paddy field at the water intake point.

[0008] This is a block diagram showing the schematic configuration of the information processing system according to Embodiment 1. This is a block diagram showing an example of the hardware configuration of the information processing device according to Embodiment 1. This is a block diagram showing an example of the hardware configuration of the information processing device according to Embodiment 1. This is a flowchart showing an example of the processing performed by the information processing device according to Embodiment 1. This is a schematic diagram for explaining the process of calculating the groundwater path performed by the information processing device according to Embodiment 1. This is a block diagram showing the schematic configuration of the information processing system according to Embodiment 2. This is a flowchart showing an example of the processing performed by the information processing device according to Embodiment 2. This is a diagram showing an example of a recharge level map displayed on a display device by the information processing device according to Embodiment 2.

[0009] The embodiments of this disclosure will now be described in detail with reference to the drawings. Embodiment 1. First, the information processing system according to Embodiment 1 will be described with reference to Figure 1. The information processing system according to Embodiment 1 is a system for calculating the degree of recharge, which indicates the degree to which the water in one or more target paddy fields recharges the intake point when the paddy field is flooded, in order to supply groundwater to an intake point where groundwater is taken and used. For example, the intake point is a point where a large amount of groundwater is taken by businesses such as semiconductor manufacturers, chemical manufacturers, and food manufacturers.

[0010] Figure 1 is a block diagram showing the schematic configuration of an information processing system according to Embodiment 1. As shown in Figure 1, the information processing system according to Embodiment 1 comprises a database (DB) 10, an input device 20, a display device 30, and an information processing device 100, which are connected wirelessly or via wired connections so that they can communicate with each other. The DB 10, the input device 20, the display device 30, and the information processing device 100 may be connected to each other via devices or communication lines not shown, or they may be configured as a single integrated device.

[0011] DB10 stores information used by the information processing device 100 for various processing tasks. For example, DB10 stores map information for a specific area including the water intake point and one or more target paddy fields. In the following description, "a specific area including the water intake point and one or more target paddy fields" is also referred to as the "specific area." In Embodiment 1, the specific area includes the water intake point and one or more target paddy fields and extends in a first direction along the horizontal and a second direction along the horizontal and perpendicular to the first direction. For example, the specific area is an area assumed to include the groundwater path from one or more target paddy fields to the water intake point. Also, for example, the first direction is the direction in which the lines of latitude extend.

[0012] Furthermore, DB10 stores information indicating the latitude and longitude of each paddy field in a specific area, soil information relating to the soil of the specific area, and total head surface information indicating the total head surface of the specific area. DB10 may also store information other than those mentioned above, such as groundwater level information indicating the groundwater level of the specific area, topography information indicating the topography of the specific area, meteorological information relating to the weather of the specific area, flow rate information indicating the flow rate of rivers flowing through the specific area, water depth information indicating the water depth of each paddy field in a flooded state in the specific area, area information indicating the area of ​​each paddy field in the specific area, etc., or it may store other information used by the information processing device 100 to perform various processing. Also, DB10 may store all of the above-mentioned information, or it may store only some of this information.

[0013] The input device 20 inputs information used by the information processing device 100 to perform various processing operations. For example, the input device 20 receives input operations from a user of the information processing system and inputs information corresponding to the input operations to the information processing device 100. For example, the input device 20 is composed of a keyboard, mouse, touch panel, or other device that inputs information corresponding to the user's input operations to the information processing device 100. The information processing device 100 may be configured to acquire the various types of information stored in the DB 10 from the input device 20 through user input operations, or it may be configured to acquire information stored in the DB 10 via the input device 20.

[0014] The display device 30 acquires information from the information processing device 100 and displays the acquired information as visual information to the user of the information processing system. For example, the display device 30 is composed of a liquid crystal display panel, an organic or inorganic EL (Electroluminescence) panel, a projector, or other devices. The display device 30 may also be integrally formed with an input device 20, which is composed of, for example, a touch panel.

[0015] The information processing device 100 includes a location information acquisition unit 111, a total hydrohead surface information acquisition unit 113, a soil information acquisition unit 116, a groundwater path calculation unit 120, a permeability acquisition unit 121, a recharge rate calculation unit 123, and a display control unit 124.

[0016] The location information acquisition unit 111 acquires location information indicating the horizontal position of the water intake point and each paddy field in a specific area. For example, the location information acquisition unit 111 acquires map information from DB 10 indicating the latitude and longitude of the water intake point and each paddy field in a specific area as location information. However, the location information acquisition unit 111 is not limited to acquiring information indicating the latitude and longitude of the water intake point and each paddy field in a specific area. The location information acquisition unit only needs to be configured to acquire location information indicating the position of the water intake point and each paddy field so that the horizontal relative positions of the total head surface, the water intake point, and each paddy field in a specific area can be determined. Furthermore, for example, the location information acquisition unit 111 may be configured to acquire a Digital Elevation Model (DEM) from DB 10 as location information, which includes information indicating the horizontal relative position between the water intake point and each paddy field in a specific area, and is acquired by radar, stereo photogrammetry, triangulation, etc., of an artificial satellite.

[0017] Furthermore, for example, the location information acquisition unit 111 may be configured to acquire radar images or optical images of a specific area from a satellite or aircraft from DB 10, and to acquire location information indicating the location of each rice paddy in a specific area by identifying the location of the rice paddy based on these images.

[0018] The total head surface information acquisition unit 113 acquires total head surface information that shows the total head surface of a specific region. For example, the total head surface information acquisition unit 113 acquires total head surface information that shows the total head surface of the entire specific region from DB 10. However, the total head surface information acquisition unit 113 is not limited to directly acquiring total head surface information that shows the total head surface of a specific region from DB 10. For example, the total head surface information acquisition unit 113 may be configured to acquire groundwater level information that shows the groundwater level of a specific region from DB 10 and to acquire total head surface information by calculating the total head surface of a specific region based on the acquired groundwater level information. Alternatively, it may be configured to acquire information that shows the height of the water surface of a river flowing through a specific region from DB 10 and to acquire total head surface information by calculating the total head surface of a specific region based on the acquired information that shows the height of the water surface of a river.

[0019] The soil information acquisition unit 116 acquires soil information relating to the attributes of the soil in a specific area. For example, the soil information acquisition unit 116 acquires soil information from DB 10 that shows the typical particle size, material, and ratio of particles of a specific particle size and material to the soil constituting the soil in the specific area, as soil information relating to the attributes of the soil in the specific area. Also, for example, the soil information acquisition unit 116 acquires soil information relating to the attributes of the soil in each area when the specific area is divided into multiple areas, as soil information relating to the attributes of the soil in each area. Note that the soil information acquisition unit 116 only needs to be configured to acquire information relating to the attributes of the soil in a specific area as soil information, and may also be configured to acquire other information relating to the soil, such as soil color and soil density.

[0020] The groundwater path calculation unit 120 calculates the groundwater path from the target paddy field to the water intake point based on the total head surface information acquired by the total head surface information acquisition unit 113, by applying the steepest descent method to the total head surface in a specific area. For example, the groundwater path calculation unit 120 calculates the groundwater path along the total head surface to the point on the total head surface corresponding to the water intake point by using the steepest descent method, which involves repeatedly moving a predetermined distance in the direction with the largest descent gradient on the total head surface, starting from a point on the total head surface corresponding to the location of the target paddy field. In other words, the groundwater path calculation unit 120 calculates the groundwater path along the entire head surface that is closest to the point where the virtual straight line extending vertically through the water intake point intersects with the entire head surface. This is achieved by using the steepest descent method, which involves repeatedly moving a predetermined distance in the direction with the largest downward slope of the entire head surface in a plan view.

[0021] Furthermore, the groundwater path calculation unit 120 is not limited to calculating the groundwater path from the target paddy field to the water intake point solely by applying the steepest descent method to the entire head surface of the specified area. It may also be configured to calculate only a portion of the groundwater path from the target paddy field to the water intake point by applying the steepest descent method to the entire head surface, or it may be configured to calculate the groundwater path from the target paddy field to the water intake point using other calculation methods in addition to the steepest descent method. In addition, the groundwater path calculation unit 120 may be configured to calculate multiple paths that pass through different points as the groundwater path from the target paddy field to the water intake point. In other words, the groundwater path calculation unit 120 may be configured to calculate multiple paths that include paths passing through a specific point and paths that do not pass through a specific point as the groundwater path from the target paddy field to the water intake point. For example, if there are multiple directions with the largest descent gradient from a specific point, the groundwater path calculation unit 120 will calculate multiple paths as the groundwater path from the target paddy field to the water intake point. Details of the process by which the groundwater path calculation unit 120 calculates the groundwater path will be described later.

[0022] The permeability acquisition unit 121 acquires information indicating the permeability along a path calculated by the groundwater path calculation unit 120, based on the soil information acquired by the soil information acquisition unit 116. For example, the permeability acquisition unit 121 stores permeability measured under specific pressures in advance in DB 10 for each soil attribute, and acquires the permeability from DB 10 according to the soil attribute of the soil along the path calculated by the groundwater path calculation unit 120, based on the soil information acquired by the soil information acquisition unit 116. Alternatively, for example, the permeability acquisition unit 121 acquires information indicating the permeability by calculating the permeability along the path through regression analysis based on a specific particle size of the soil particles, the known permeability of the soil, and the particle size of the soil along the path calculated by the groundwater path calculation unit 120, as indicated by the soil information. The permeability K is expressed by the following formula (1), where L is the length of the path and T is the time taken to pass through the path: K = L / T ... (1)

[0023] The permeability acquisition unit 121 may be configured to acquire the overall permeability of a route based on soil information relating to the soil attributes of the entire route calculated by the groundwater route calculation unit 120. Alternatively, the permeability acquisition unit 121 may be configured to acquire the permeability of each route when the route calculated by the groundwater route calculation unit 120 is divided into multiple routes in the longitudinal direction. In other words, the permeability acquisition unit 121 may be configured to acquire the permeability of each route when the route calculated by the groundwater route calculation unit 120 is a route that goes from the first point to the second point, the third point, ..., the (n-1)th point, the nth point, the (n+1)th point, and so on, and the route is divided into n routes such as the route from the first point to the second point, the route from the second point to the third point, ..., the route from the nth point to the (n+1)th point, and the length of each route may be a predetermined specific distance, a very small length, or different lengths between each route.

[0024] The recharge rate calculation unit 123 calculates the recharge rate, which indicates the degree to which water is recharged in the target paddy field relative to the water intake point, based on the length of the path calculated by the groundwater path calculation unit 120 and the permeability obtained by the permeability acquisition unit 121. In Embodiment 1, the recharge rate S is expressed by the following formula (2), where K is the permeability and L is the length of the path. Furthermore, as is clear from formulas (1) and (2), the recharge rate S is expressed as the reciprocal of the time required for groundwater movement. S = K / L ... (2)

[0025] The recharge rate calculation unit 123 may be configured to calculate the recharge rate by dividing the permeability by the length obtained by adding the vertical distance from the target paddy field to the total head curve surface to the length of the groundwater path calculated by the groundwater path calculation unit 120. Furthermore, if the groundwater path calculation unit 120 calculates multiple paths passing through different points, and the permeability acquisition unit 121 acquires the permeability for each path divided longitudinally, the recharge rate is expressed as the sum of the values ​​obtained by dividing the permeability by the length of each of these multiple paths, and is represented by the following formula (3). In formula (3), n represents the number of paths.

[0026] The display control unit 124 causes the display device 30 to display images related to the processing performed by the information processing device 100. In other words, the display control unit 124 automatically displays images on the display device 30 showing the nutrients calculated by the nutrients calculation unit 123 based on the results of the processing by the information processing device 100. For example, the display control unit 124 displays images showing the nutrients on the display device 30 in a manner that allows the user to visually recognize which paddy field the nutrients calculated by the nutrients calculation unit 123 corresponds to. Specifically, the display control unit 124 displays images related to the target paddy field and images showing the nutrients calculated by the nutrients calculation unit 123 on the display device 30 in a manner that allows the user to visually recognize the correspondence between them. For example, the display control unit 124 causes the display device 30 to display images related to the target paddy field and images showing the degree of water replenishment, including images that include text information indicating the location, manager, area, etc., of the target paddy field, and images that include text information indicating the degree of water replenishment of the paddy field.

[0027] The display control unit may be configured to display images other than text information on the display device 30 as images related to the target paddy field and images showing the water level. For example, the display control unit may be configured to display images related to the target paddy field on the display device 30 that include map information showing the location of the paddy field, or it may be configured to display images showing the water level on the display device 30 that include a color map in which the water level corresponding to each point on the map is displayed based on a specific color scale or grayscale.

[0028] Next, the hardware configuration of the information processing device 100 will be described with reference to Figures 2 and 3. Figure 2 is a diagram showing an example of the hardware configuration of the information processing device 100, and Figure 3 is a diagram showing an example of the hardware configuration of the information processing device 100 that is different from Figure 2. For example, as shown in Figure 2, the information processing device 100 is composed of a computer having a processor 100a, memory 100b, and I / O port 100c, and the processor 100a reads and executes a program stored in memory 100b.

[0029] Furthermore, as shown in Figure 3, for example, the information processing device 100 is comprised of a computer that executes programs, having a processing circuit 100d which is dedicated hardware, and an I / O port 100c. The processing circuit 100d is comprised of, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a combination thereof. Each function of the information processing device 100 is realized by these processors 100a or the processing circuit 100d which is dedicated hardware executing programs. Note that the information processing device 100 may also have hardware other than those described above, such as a hardware timer.

[0030] Next, with reference to Figures 1, 4 to 6, the details of the processing performed by the information processing device 100 will be explained. Figure 4 is a flowchart showing an example of the processing performed by the information processing device 100 according to Embodiment 1. The processing performed by the information processing device 100 shown in Figure 4 is a process for calculating the degree of water replenishment, which indicates the degree to which water is replenished in the paddy field at the water intake point, based on information acquired from DB 10 and input device 20.

[0031] As shown in Figure 4, when the information processing device 100 starts processing, it first acquires location information (step ST01). In this process, the information processing device 100 acquires location information indicating the horizontal relative position between the water intake point in a specific area and the paddy field that is the target of the calculation of the water recharge level, using the location information acquisition unit 111. In the following description, the "paddy field that is the target of the calculation of the water recharge level" will also be referred to as the "target paddy field".

[0032] When the information processing device 100 performs the processing in step ST01, it acquires total head surface information showing the total head surface of a specific region (step ST04). In this process, the information processing device 100 acquires total head surface information using the total head surface information acquisition unit 113, which shows the total head surface of a range that includes the entire path of the groundwater along the total head surface as the groundwater recharged from the target paddy field moves to the water intake point in a first direction along the horizontal direction and a second direction along the horizontal direction and perpendicular to the first direction.

[0033] When the information processing device 100 performs the processing in step ST04, it calculates the groundwater path (step ST05). In this process, the information processing device 100 calculates the groundwater path along the entire head surface from the target paddy field to the water intake point, based on the position information obtained in step ST01 and the total head surface information obtained in step ST04, by applying the steepest descent method to the entire head surface indicated by the total head surface information, using the groundwater path calculation unit 120.

[0034] Figure 5 is a schematic diagram illustrating the process of calculating groundwater paths performed by the information processing device 100 according to Embodiment 1. As shown in Figure 5, for example, starting from point A, which is a point on the total head surface S1 corresponding to the location of the target paddy field, the steepest descent method is used to calculate the path P1 to point B by repeatedly performing the operation of moving a predetermined distance in the direction with the largest downward slope on the total head surface S1. Point B is a point where there is no direction with a downward slope in all directions in a plan view. For example, when such a point is reached by applying the steepest descent method to the total head surface S1, point C, which is the point where the slope changes from an upward slope to a downward slope with the smallest amount of upward movement from that point, is extracted, and by restarting the steepest descent method after passing point C, the path P3 from point C to point D, which is a point on the total head surface S1 corresponding to the water intake point, can be calculated. Note that the path P2 from point B to point C corresponds to the path that reaches point B by applying the steepest descent method to the total head surface S1 starting from point C. The information processing device 100 calculates the path of groundwater from the target paddy field to the water intake point through this processing.

[0035] When the information processing device 100 performs the processing in step ST05, it acquires soil information relating to the attributes of the soil in a specific area (step ST06). In this process, the information processing device 100 acquires soil information relating to the attributes of the soil along the groundwater path, calculated in the processing of step ST05, in the specific area using the soil information acquisition unit 116. In this process, the soil information acquisition unit 116 is not limited to acquiring soil information for the entire specific area. The soil information acquisition unit 116 only needs to be configured to acquire soil information relating to the attributes of the soil along the groundwater path, calculated in the processing of step ST05. For example, if the soil information acquisition unit 116 also acquires soil information relating to the attributes of soil not along the groundwater path, it can improve the accuracy of the recharge calculation result by the recharge calculation unit 123 by acquiring soil information relating to the attributes of soil along the groundwater path and other soil information in a distinguishable manner.

[0036] When the information processing device 100 performs the processing in step ST06, it obtains the permeability of the path (step ST07). In this process, the information processing device 100 obtains the permeability of the groundwater path calculated in step ST05, based on the soil information obtained in step ST06, using the permeability acquisition unit. In other words, the information processing device 100 obtains the permeability when groundwater is recharged along the groundwater path calculated in step ST05, based on the soil information obtained in step ST06, using the permeability acquisition unit.

[0037] After performing the processing in step ST07, the information processing device 100 calculates the recharge rate (step ST13). In this process, the information processing device 100 uses a recharge rate calculation unit 123 to calculate the recharge rate, which indicates the degree to which water is recharged at the water intake point of the target paddy field, based on the groundwater path calculated in step ST05 and the permeability obtained in step ST07.

[0038] When the information processing device 100 completes the process in step ST13, it displays the water recharge level on the display device 30 (step ST14). In this process, the information processing device 100 outputs information indicating the water recharge level calculated in step ST13 to the display device 30, and displays the water recharge level on the display device 30, thereby informing the user of the water recharge level corresponding to the target paddy field. The information processing device 100 may also be configured to calculate the water recharge level for each of the multiple paddy fields relative to the water intake point, and to display the calculated multiple water recharge levels and the locations of the multiple paddy fields corresponding to each water recharge level on the display device 30. With this configuration, the information processing device 100 enables the user to compare and evaluate the water recharge levels corresponding to multiple paddy fields based on the image displayed on the display device 30. When the information processing device 100 completes the process in step ST14, it terminates the process.

[0039] As described above, the information processing device 100 according to Embodiment 1 includes: a position information acquisition unit 111 that acquires position information indicating the horizontal position of the water intake point and the paddy field; a total head surface information acquisition unit 113 that acquires total head surface information indicating the total head surface of a specific area including the water intake point and the paddy field, extending in a first direction along the horizontal direction and a second direction along the horizontal direction and perpendicular to the first direction; a soil information acquisition unit 116 that acquires soil information relating to the attributes of the soil in the specific area; and, based on the total head surface information acquired by the total head surface information acquisition unit 113, from the paddy field The system includes a groundwater path calculation unit 120 that calculates the path of groundwater to the water intake point by applying the steepest descent method to the entire head surface of a specific area; a permeability acquisition unit 121 that acquires the permeability in the path calculated by the groundwater path calculation unit 120 based on soil information acquired by the soil information acquisition unit 116; and a recharge rate calculation unit 123 that calculates the degree of recharge, which indicates the degree to which water is recharged in the paddy field relative to the water intake point, based on the length of the path calculated by the groundwater path calculation unit 120 and the permeability acquired by the permeability acquisition unit 121.

[0040] With this configuration, the information processing device 100 can evaluate the degree to which water is recharged in a paddy field by the recharge rate, which indicates the degree to which water is recharged in the paddy field relative to the water intake point when the paddy field is flooded. Furthermore, since the information processing device 100 calculates the path of groundwater from the paddy field to the water intake point by applying the steepest descent method to the entire head surface of a specific region, it can calculate the path of groundwater in a specific region extending in the first and second directions with higher accuracy than before, and thus evaluate the degree to which water is recharged in the paddy field with higher accuracy than before.

[0041] Embodiment 2. Next, the information processing system according to Embodiment 2 will be described with reference to Figures 6 to 8. In the information processing system according to Embodiment 1, when acquiring the permeability rate based on soil information, for example, the permeability rate measured in advance under a specific pressure for each soil attribute is acquired from DB10. The information processing system according to Embodiment 2 differs from the information processing system according to Embodiment 1 in that the information processing device considers a coefficient for weighting the permeability rate when calculating the recharge rate, but other configurations are the same, and the same names and reference numerals as in Embodiment 1 are used and the explanation is omitted.

[0042] Generally, the permeability and the recharge rate described above vary depending on the topography, weather conditions, and other conditions at the time of recharge. For this reason, the information processing system according to Embodiment 2 is a system for calculating the recharge rate that takes into account the influence of various conditions that cause changes in the permeability and recharge rate by setting coefficients for weighting the permeability according to these conditions. As shown in Figure 6, the information processing system according to Embodiment 2 comprises a DB 10, an input device 20, a display device 30, and an information processing device 100A, which are connected wirelessly or by wire so that they can communicate with each other. The information processing device 100A includes a location information acquisition unit 111, an elevation information acquisition unit 112, a total head surface information acquisition unit 113A, a soil information acquisition unit 116, a paddy field information acquisition unit 117, a weather information acquisition unit 118, a flow rate information acquisition unit 119, a groundwater path calculation unit 120, a permeability acquisition unit 121, a coefficient setting unit 122, a recharge level calculation unit 123A, and a display control unit 124.

[0043] The undulation information acquisition unit 112 acquires undulation information indicating the undulation of the ground surface in a specific area. In other words, the undulation information acquisition unit 112 acquires undulation information indicating the heights of a plurality of points on the ground surface in the specific area. For example, the undulation information acquisition unit 112 acquires, as the undulation information, a digital elevation model whose relative position with respect to the position information acquired by the position information acquisition unit 111 is clear from the DB 10. Note that the undulation information acquisition unit 112 only needs to be configured to acquire undulation information indicating at least the relative undulation of the ground surface in the specific area, and is not limited to acquiring absolute altitudes such as elevations at each part of the specific area.

[0044] The total head surface information acquisition unit 113A includes a groundwater level information acquisition unit 114 and a total head surface calculation unit 115.

[0045] The groundwater level information acquisition unit 114 acquires groundwater level information indicating the groundwater levels at a plurality of points in the specific area. For example, the groundwater level information acquisition unit 114 acquires, as the groundwater level information, groundwater level information indicating the elevations of the total head surfaces measured at a plurality of points in the specific area. For example, the elevation of the total head surface at a specific point can be obtained by the difference between the distance from the ground surface to the total head surface (groundwater surface) at the specific point and the elevation of the specific point obtained based on the undulation information acquired by the undulation information acquisition unit 112. Also, for example, the groundwater level information acquisition unit 114 acquires radar images or optical images of the specific area obtained by remote sensing using artificial satellites or aircraft from the DB 10, and acquires groundwater level information indicating the groundwater levels at a plurality of points in the specific area based on these images. For example, from the radar image or optical image of the specific area, at a point where water exists on the ground surface, it can be regarded that the elevation of the groundwater level coincides with the elevation of the surface of the water existing on the ground surface.

[0046] The total head surface calculation unit 115 calculates the total head surface based on the groundwater level information acquired by the groundwater level information acquisition unit 114. For example, based on the groundwater level information acquired by the groundwater level information acquisition unit 114, a total head surface, which is a surface passing through the groundwater levels at multiple points in a specific area, is calculated. Thus, the total head surface information acquisition unit 113A acquires the total head surface information by calculating the total head surface based on the groundwater level information acquired by the groundwater level information acquisition unit 114.

[0047] The paddy field information acquisition unit 117 acquires water depth information indicating the water depth of the target paddy field. For example, the paddy field information acquisition unit 117 acquires water depth information indicating the water depth of the target paddy field based on an input operation by the user to the input device 20. The water depth information acquired by the paddy field information acquisition unit 117 may be information based on the measured value of the water depth of the paddy field, or information based on a value calculated based on the amount of water supplied to the paddy field, or information based on a value estimated using other information.

[0048] In addition, the paddy field information acquisition unit 117 acquires area information indicating the area of the target paddy field. For example, the paddy field information acquisition unit 117 acquires area information indicating the area of the target paddy field based on an input operation by the user to the input device 20. Also, for example, the paddy field information acquisition unit 117 acquires area information indicating the area of the paddy field corresponding to the position of the target paddy field from the DB 10 based on the position information acquired by the position information acquisition unit 111. Also, for example, the paddy field information acquisition unit 117 acquires a radar image or an optical image of a specific area acquired by remote sensing by an artificial satellite or an aircraft from the DB 10, and calculates the area of the target paddy field by identifying the contour of the paddy field based on these images to acquire the area information.

[0049] The weather information acquisition unit 118 acquires weather information regarding the weather in a specific area. For example, the weather information acquisition unit 118 acquires weather information regarding the weather such as precipitation, sunshine duration, temperature, humidity, etc. in a specific period in the specific area from the DB 10.

[0050] The flow rate information acquisition unit 119 acquires flow rate information indicating the flow rate of a river in a specific area. For example, the flow rate information acquisition unit 119 acquires flow rate information indicating the average flow rate of one or more rivers flowing in the vicinity of a specific area over a specific period of time.

[0051] The coefficient setting unit 122 sets coefficients for weighting the permeability obtained by the permeability acquisition unit 121. For example, the coefficient setting unit 122 sets coefficients for weighting the permeability based on the relief information obtained by the relief information acquisition unit 112. Generally, the greater the vertical distance from the groundwater level to the ground surface, the greater the pressure on the groundwater. For this reason, for example, the coefficient setting unit 122 calculates the vertical distance between the ground surface and the total head curved surface along the said path based on the relief information obtained by the relief information acquisition unit 112 and the path calculated by the groundwater path calculation unit 120, and sets the coefficients such that the coefficient increases as the distance increases. Specifically, the coefficient setting unit 122 calculates the average vertical distance between the ground surface and the total hydrohead curved surface along the said path, based on the relief information acquired by the relief information acquisition unit 112 and the path calculated by the groundwater path calculation unit 120, and sets the coefficient such that the larger the average of said distance, the larger the coefficient.

[0052] Furthermore, for example, the coefficient setting unit 122 sets a coefficient for weighting the permeability rate based on the water depth information acquired by the paddy field information acquisition unit 117. Generally, when a paddy field is flooded, the greater the water depth of the paddy field, the greater the pressure on the groundwater. For this reason, for example, the coefficient setting unit 122 sets a coefficient for weighting the permeability rate based on the water depth information acquired by the paddy field information acquisition unit 117, such that the coefficient increases as the water depth of the target paddy field increases.

[0053] Furthermore, for example, the coefficient setting unit 122 sets a coefficient for weighting the permeability rate based on the area information acquired by the paddy field information acquisition unit 117. Generally, when a paddy field is flooded, the larger the area of ​​the paddy field, the greater the amount of water that is replenished in the paddy field. For this reason, for example, the coefficient setting unit 122 sets a coefficient for weighting the permeability rate based on the area information acquired by the paddy field information acquisition unit 117, such that the coefficient increases as the area of ​​the target paddy field increases.

[0054] Furthermore, for example, the coefficient setting unit 122 sets coefficients for weighting the permeability based on meteorological information acquired by the meteorological information acquisition unit 118. Generally, the greater the precipitation, the greater the amount of water supplied to the paddy field; the shorter the sunshine hours, the less water evaporates from the paddy field; the lower the temperature, the less water evaporates from the paddy field; and the higher the humidity, the less water evaporates from the paddy field. For this reason, for example, the coefficient setting unit 122 sets coefficients for weighting the permeability based on meteorological information acquired by the meteorological information acquisition unit 118, such that the coefficient increases as the precipitation, sunshine hours, temperature, and humidity increase in the area corresponding to the target paddy field during a specific period. Specifically, the coefficient setting unit 122 sets coefficients for weighting the permeability based on weather information acquired by the weather information acquisition unit 118, so that the coefficients correspond to the representative values ​​of precipitation, sunshine hours, temperature, and humidity in the area corresponding to the target paddy field during the period in which groundwater moves along the path calculated by the groundwater path calculation unit 120.

[0055] Furthermore, for example, the coefficient setting unit 122 sets a coefficient for weighting the permeability based on the flow rate information acquired by the flow rate information acquisition unit 119. Generally, when water from rice paddies, etc., is recharged and becomes groundwater and moves to other locations, some of the groundwater flows to the surface through rivers adjacent to the groundwater path. For this reason, for example, the coefficient setting unit 122 sets a coefficient for weighting the permeability based on the groundwater path calculated by the groundwater path calculation unit 120 and the flow rate information acquired by the flow rate information acquisition unit 119, such that the coefficient increases as the flow rate of rivers flowing near the groundwater path in a specific area decreases during a specific period.

[0056] Specifically, the coefficient setting unit 122 sets a coefficient for weighting the permeability based on the groundwater path calculated by the groundwater path calculation unit 120 and the flow rate information acquired by the flow rate information acquisition unit 119, such that the coefficient increases as the flow rate of a river flowing within a predetermined distance from the groundwater path decreases during the period in which the groundwater moves along that path. The coefficient setting unit 122 may be configured to set the coefficient to be the largest possible when there are no rivers flowing within a predetermined distance from the groundwater path among the rivers flowing in the specific area, or it may be configured to set the coefficient to be the largest possible as the distance from the groundwater path increases among the rivers flowing in the specific area.

[0057] For example, DB10 stores in advance a plurality of coefficients corresponding to values ​​indicated by information that can be considered as factors that change these permeability and recharge rates, and the coefficient setting unit 122 sets a coefficient by referring to the coefficient information stored in DB10 and selecting one of these plurality of coefficients. Specifically, DB10 stores in advance several coefficients corresponding to the vertical distance between the ground surface and the total head curve along the groundwater path, several coefficients corresponding to the water depth of the target paddy field, several coefficients corresponding to the area of ​​the target paddy field, several coefficients corresponding to the precipitation in the area corresponding to the target paddy field during a specific period, several coefficients corresponding to the sunshine hours in the area corresponding to the target paddy field during a specific period, several coefficients corresponding to the temperature in the area corresponding to the target paddy field during a specific period, several coefficients corresponding to the humidity in the area corresponding to the target paddy field during a specific period, and several coefficients corresponding to the flow rate of a river flowing within a predetermined distance from the groundwater path. The coefficient setting unit 122 refers to the coefficient information stored in DB10, selects a coefficient corresponding to each piece of information obtained, and calculates a coefficient used to calculate the recharge level by multiplying or adding the selected coefficients.

[0058] For example, DB10 may pre-store multiple coefficients corresponding to values ​​indicated by information considered to be factors that change the permeability and recharge rate, and the coefficient setting unit 122 may be configured to set coefficients by referencing the coefficient information stored in DB10 and performing regression analysis based on the acquired information and these multiple coefficients. Furthermore, if the groundwater path calculation unit 120 calculates multiple paths passing through different points, and the permeability acquisition unit 121 acquires the permeability rate for each path divided longitudinally, the coefficient setting unit 122 may be configured to set coefficients for each of these multiple paths. Furthermore, the coefficient setting unit 122 may be configured to set coefficients based on only a part of the information described above, or it may be configured to set coefficients based on information other than that described above, which is considered to be factors that change the permeability and recharge rate, in addition to the information described above. For example, the coefficient setting unit 122 may acquire information indicating the volume of water supplied to the target paddy field for flooding, and set coefficients such that the larger the volume of water supplied to the target paddy field, the larger the coefficient.

[0059] The recharge rate calculation unit 123A calculates the degree to which water is recharged at the water intake point of the target paddy field, based on the length of the path calculated by the groundwater path calculation unit 120, the permeability obtained by the permeability acquisition unit 121, and the coefficient set by the coefficient setting unit 122. In Embodiment 2, the recharge rate S is expressed by the following formula (4), where K is the permeability, L is the length of the path, and α is the coefficient: S = α × K / L ... (4)

[0060] The water level calculation unit 123A may be configured to calculate the total water level when multiple adjacent paddy fields are flooded at the same time. When calculating such a water level, the water level calculation unit 123A may be configured to calculate the total water level when multiple paddy fields are flooded at the same time by, for example, obtaining area information indicating the total area of ​​these multiple paddy fields from the paddy field information acquisition unit 117 and calculating the water level using a coefficient set based on said area information, or it may be configured to calculate the total water level when multiple paddy fields are flooded at the same time by calculating the sum of the water levels calculated for each paddy field.

[0061] Furthermore, if the groundwater path calculation unit 120 calculates multiple paths passing through different points, and the permeability acquisition unit 121 acquires the permeability for each path divided longitudinally, the recharge rate S is expressed by the following formula (5) as the sum of the values ​​obtained by dividing the permeability by the length of each of these multiple paths. In formula (5), n represents the number of paths. The coefficient α may be a different value for each of these multiple paths, or it may be a common value.

[0062] The hardware configuration of the information processing device 100A is the same as that of the information processing device 100 according to Embodiment 1, so its description will be omitted.

[0063] Next, with reference to Figures 6 to 8, the details of the processing performed by the information processing device 100A will be described. Figure 7 is a flowchart showing an example of the processing performed by the information processing device 100A according to Embodiment 2. Note that some of the processing performed by the information processing device 100A according to Embodiment 2 is the same as the processing performed by the information processing device 100 according to Embodiment 1, so the same processing as in Embodiment 1 is denoted by the same reference numerals as in Embodiment 1 and its description is omitted.

[0064] As shown in Figure 7, when the information processing device 100A starts processing, it first acquires location information (step ST01). After performing the processing in step ST01, the information processing device 100A acquires topographic information (step ST02). In this process, the information processing device 100A acquires topographic information indicating the topography of the ground surface in a specific area using the topographic information acquisition unit 112.

[0065] After performing the processing in step ST02, the information processing device 100A acquires groundwater level information (step ST03). In this process, the information processing device 100A acquires groundwater level information indicating the groundwater level at multiple points in a specific area using the groundwater level information acquisition unit 114.

[0066] When the information processing device 100A performs the processing in step ST03, it acquires total head surface information that shows the total head surface of a specific region (step ST21). In this process, the information processing device 100A acquires total head surface information by having the total head surface information acquisition unit 113A calculate the total head surface in a range that includes the entire path of the groundwater along the total head surface as the groundwater recharged from the target paddy field moves to the water intake point in a first direction along the horizontal direction and a second direction along the horizontal direction and perpendicular to the first direction.

[0067] When the information processing device 100A performs the processing in step ST21, it calculates the groundwater pathway (step ST05). When the information processing device 100A performs the processing in step ST05, it acquires soil information regarding the attributes of the soil in a specific area (step ST06). When the information processing device 100A performs the processing in step ST06, it acquires the permeability of the pathway (step ST07).

[0068] When the information processing device 100A performs the processing in step ST07, it acquires water depth information (step ST08). In this process, the information processing device 100A acquires water depth information indicating the water depth of the target paddy field corresponding to the starting point of the path calculated in step ST05, using the paddy field information acquisition unit 117.

[0069] When the information processing device 100A performs the processing in step ST08, it acquires area information (step ST09). In this process, the information processing device 100A acquires area information indicating the area of ​​the target paddy field corresponding to the starting point of the route calculated in step ST05, using the paddy field information acquisition unit 117.

[0070] When the information processing device 100A performs the processing in step ST09, it acquires weather information (step ST10). In this process, the information processing device 100A, for example, acquires weather information for a specific period in the area including the target paddy field corresponding to the starting point of the route calculated in step ST05, using the weather information acquisition unit 118.

[0071] When the information processing device 100A performs the processing in step ST10, it acquires flow rate information (step ST11). In this process, the information processing device 100A acquires flow rate information, for example, from the flow rate information acquisition unit 119, which indicates the flow rate of a river flowing within a predetermined distance calculated in step ST05, over a specific period of time.

[0072] When the information processing device 100A performs the processing in step ST11, it sets a weighting coefficient for the water permeability (step ST12). In this process, the information processing device 100A uses the coefficient setting unit 122 to set a coefficient for weighting the water permeability obtained by the water permeability acquisition unit 121, based on the information obtained in steps ST02 and ST07 to ST11.

[0073] After performing the processing in step ST12, the information processing device 100A calculates the recharge rate (step ST22). In this process, the information processing device 100A uses a recharge rate calculation unit 123 to calculate the recharge rate, which indicates the degree to which water is recharged in the target paddy field relative to the water intake point, based on the groundwater path calculated in step ST05, the permeability obtained in step ST07, and the coefficient set in step ST12.

[0074] When the information processing device 100A performs the processing in step ST22, it displays the regeneration level on the display device 30 (step ST23). In this process, the information processing device 100A outputs information indicating the regeneration level calculated in the processing in step ST13 to the display device 30, and displays the regeneration level on the display device 30, thereby informing the user of the regeneration level corresponding to the target paddy field. For example, the information processing device 100A displays on the display device 30, via the display control unit 124, an image including map information showing the location of the target paddy field, and an image including a color map in which the regeneration level corresponding to each point on the map is displayed based on a specific color scale or grayscale.

[0075] Figure 8 shows an example of a recharge map as a color map of recharge levels that the information processing device 100A according to Embodiment 2 displays on the display device 30. As shown in Figure 8, the information processing device 100A, for example, in the processing of step ST23, displays on the display device 30 an image consisting of map information of a specific area, an image showing the locations of paddy fields A1, A2, and A3 on the map, an image showing the water intake point D, an image showing latitude and longitude scales for paddy fields A1, A2, A3 and water intake point D, an image showing the groundwater path from paddy fields A1, A2, and A3 to water intake point D, an image showing the recharge level in shades of color, and an image showing a shade scale corresponding to the shades of recharge level. This makes it possible for the user to visually recognize whether the recharge level of a specific paddy field shown on the map is high or low compared to the surrounding area.

[0076] As described above, the information processing device 100A according to Embodiment 2 includes: a position information acquisition unit 111 that acquires position information indicating the horizontal position of the water intake point and the paddy field; a total head surface information acquisition unit 113A that acquires total head surface information indicating the total head surface of a specific area including the water intake point and the paddy field, extending in a first direction along the horizontal direction and a second direction along the horizontal direction and perpendicular to the first direction; a soil information acquisition unit 116 that acquires soil information relating to the attributes of the soil in the specific area; a groundwater path calculation unit 120 that calculates the groundwater path from the paddy field to the water intake point by applying the steepest descent method to the total head surface of the specific area based on the total head surface information acquired by the total head surface information acquisition unit 113; and soil information acquired by the soil information acquisition unit 116. Based on this, the system includes a permeability acquisition unit 121 that acquires the permeability in the path calculated by the groundwater path calculation unit 120, a recharge rate calculation unit 123 that calculates a recharge rate indicating the degree to which water is recharged in the paddy field relative to the water intake point based on the length of the path calculated by the groundwater path calculation unit 120 and the permeability acquired by the permeability acquisition unit 121, and a coefficient setting unit 122 that sets a coefficient for weighting the permeability acquired by the permeability acquisition unit, and the recharge rate calculation unit 123A is configured to calculate the recharge rate of the paddy field relative to the water intake point based on the length of the path calculated by the groundwater path calculation unit 120, the permeability acquired by the permeability acquisition unit 121 and the coefficient set by the coefficient setting unit 122.

[0077] For example, the information processing device 100A according to Embodiment 2 includes an elevation information acquisition unit 112 that acquires elevation information indicating the elevation of the ground surface in a specific area, and a coefficient setting unit 122 that sets a coefficient for weighting the permeability acquired by the permeability acquisition unit 121 based on the elevation information acquired by the elevation information acquisition unit 112. The recharge level calculation unit 123A is configured to calculate the recharge level of a paddy field relative to a water intake point based on the length of the path calculated by the groundwater path calculation unit 120, the permeability acquired by the permeability acquisition unit 121, and the coefficient set by the coefficient setting unit 122.

[0078] Furthermore, for example, the information processing device 100A according to Embodiment 2 includes a paddy field information acquisition unit 117 that acquires water depth information indicating the water depth of a paddy field, and a coefficient setting unit 122 that sets coefficients for weighting the permeability acquired by the permeability acquisition unit 121 based on the water depth information acquired by the paddy field information acquisition unit 117. The recharge level calculation unit 123A is configured to calculate the recharge level of the paddy field relative to the water intake point based on the length of the path calculated by the groundwater path calculation unit 120, the permeability acquired by the permeability acquisition unit 121, and the coefficients set by the coefficient setting unit 122.

[0079] Furthermore, for example, the information processing device 100A according to Embodiment 2 includes a paddy field information acquisition unit 117 that acquires area information indicating the area of ​​a paddy field, and a coefficient setting unit 122 that sets coefficients for weighting the permeability acquired by the permeability acquisition unit 121 based on the area information acquired by the paddy field information acquisition unit 117. The recharge level calculation unit 123A is configured to calculate the recharge level of the paddy field relative to the water intake point based on the length of the path calculated by the groundwater path calculation unit 120, the permeability acquired by the permeability acquisition unit 121, and the coefficients set by the coefficient setting unit 122.

[0080] Furthermore, for example, the information processing device 100A according to Embodiment 2 includes a weather information acquisition unit 118 that acquires weather information relating to the weather in a specific area, and a coefficient setting unit 122 that sets coefficients for weighting the permeability acquired by the permeability acquisition unit 121 based on the weather information acquired by the weather information acquisition unit 118. The recharge level calculation unit 123A is configured to calculate the recharge level of a paddy field relative to a water intake point based on the length of the path calculated by the groundwater path calculation unit 120, the permeability acquired by the permeability acquisition unit 121, and the coefficients set by the coefficient setting unit 122.

[0081] Furthermore, for example, the information processing device 100A according to Embodiment 2 includes a flow rate information acquisition unit 119 that acquires flow rate information indicating the flow rate of a river in a specific area, and a coefficient setting unit 122 that sets coefficients for weighting the permeability acquired by the permeability acquisition unit 121 based on the flow rate information acquired by the flow rate information acquisition unit 119, and the recharge level calculation unit 123A is configured to calculate the recharge level of a paddy field relative to a water intake point based on the length of the path calculated by the groundwater path calculation unit 120, the permeability acquired by the permeability acquisition unit 121, and the coefficient set by the coefficient setting unit 122.

[0082] With this configuration, the information processing device 100A can calculate the recharge rate taking into account the influence of various conditions that cause changes in permeability and recharge rate, thereby improving the accuracy of calculating the recharge rate compared to conventional methods. Furthermore, by setting the various conditions for setting the coefficients using the coefficient setting unit 122 based on past information, it becomes possible to calculate past recharge rates and predict the amount of groundwater increase resulting from flooding paddy fields in the past. Additionally, by setting the various conditions for setting the coefficients using the coefficient setting unit 122 based on future information, it becomes possible to calculate future recharge rates and predict the amount of groundwater increase when paddy fields are flooded in the future.

[0083] For example, the information processing device 100A according to Embodiment 2 includes a groundwater level information acquisition unit 114 that acquires groundwater level information indicating the groundwater level at multiple points in a specific area, and the total head surface information acquisition unit 113A is configured to acquire total head surface information by calculating the total head surface based on the groundwater level information acquired by the groundwater level information acquisition unit 114. Furthermore, the information processing device 100A according to Embodiment 2 includes an elevation information acquisition unit 112 that acquires elevation information indicating the elevation of the ground surface in a specific area, and the total head surface information acquisition unit 113A is configured to acquire total head surface information by calculating the total head surface based on the elevation information acquired by the elevation information acquisition unit 112. With this configuration, the information processing device 100A can calculate the total head surface and calculate the recharge rate of the paddy field relative to the water intake point, even if the total head surface of the area for which the groundwater path is calculated is unknown.

[0084] Furthermore, the information processing device 100A according to Embodiment 2 includes a display control unit 124 that displays images on the display device 30, a position information acquisition unit 111 that acquires position information indicating the horizontal positions of the water intake point, the first paddy field and the second paddy field, a total head surface information acquisition unit 113A that acquires total head surface information indicating the total head surface of a specific area including the water intake point, the first paddy field and the second paddy field, a groundwater path calculation unit 120 that calculates the first path of groundwater from the first paddy field to the water intake point and the second path of groundwater from the second paddy field to the water intake point based on the total head surface information acquired by the total head surface information acquisition unit 113A by applying the steepest descent method to the total head surface of the area, and a permeability acquisition unit 121 that uses a soil information acquisition unit 116 Based on the acquired soil information, the permeability of the first path calculated by the groundwater path calculation unit 120 and the permeability of the second path calculated by the groundwater path calculation unit 120 are acquired, and the recharge level calculation unit 123A calculates the recharge level of the first paddy field relative to the water intake point and the recharge level of the second paddy field relative to the water intake point based on the length of the first path and the length of the second path calculated by the groundwater path calculation unit 120 and the permeability acquired by the permeability level acquisition unit 121, and the display control unit 124 is configured to display the recharge level of the first paddy field relative to the water intake point, the recharge level of the second paddy field relative to the water intake point, the location of the first paddy field, and the location of the second paddy field, which are calculated by the recharge level calculation unit 123A, on the display device 30.

[0085] With this configuration, the information processing device 100A according to Embodiment 2 calculates the degree of water replenishment for each of the multiple paddy fields relative to the water intake point, and displays the calculated multiple replenishment degrees and the locations of the multiple paddy fields corresponding to each replenishment degree on the display device 30. This makes it possible for the user to compare and evaluate the replenishment degrees corresponding to the multiple paddy fields based on the images displayed on the display device 30.

[0086] In any of the embodiments described above, the information processing device may include some or all of the functions of the DB 10, the input device 20, and the display device 30, or some of the components of the information processing device may be provided in another device that is communicatively connected to the information processing device.

[0087] Furthermore, this disclosure allows for free combination of each embodiment, modification of any component of each embodiment, or omission of any component in each embodiment.

[0088] The information processing device relating to this disclosure can be used to calculate the degree of water replenishment, which indicates the degree to which water is replenished in a paddy field relative to the water intake point.

[0089] 10 Database, 20 Input device, 30 Display device, 100 Information processing device, 100A Information processing device, 100a Processor, 100b Memory, 100c I / O port, 100d Processing circuit, 111 Location information acquisition unit, 112 Elevation information acquisition unit, 113 Total head surface information acquisition unit, 113A Total head surface information acquisition unit, 114 Groundwater level information acquisition unit, 115 Total head surface calculation unit, 116 Soil information acquisition unit, 117 Paddy field information acquisition unit, 118 Weather information acquisition unit, 119 Flow rate information acquisition unit, 120 Groundwater path calculation unit, 121 Permeability acquisition unit, 122 Coefficient setting unit, 123 Recharge level calculation unit, 123A Recharge level calculation unit, 124 Display control unit, A Location, A1 Paddy field, A2 Paddy field, A3 Paddy field, B Location C, D intake point, K permeability, P1 route, P2 route, P3 route, S1 total head surface, α coefficient.

Claims

1. A location information acquisition unit that acquires location information indicating the horizontal position of the water intake point and the paddy field; a total head surface information acquisition unit that acquires total head surface information indicating the total head surface of the region including the water intake point and the paddy field, extending in a first direction along the horizontal direction and a second direction along the horizontal direction and perpendicular to the first direction; a soil information acquisition unit that acquires soil information relating to the attributes of the soil in the region; a groundwater path calculation unit that calculates the path of groundwater from the paddy field to the water intake point by applying the steepest descent method to the total head surface of the region based on the total head surface information acquired by the total head surface information acquisition unit; and a permeability acquisition unit that acquires the permeability in the path calculated by the groundwater path calculation unit based on the soil information acquired by the soil information acquisition unit. An information processing device comprising: a recharge rate calculation unit that calculates a recharge rate indicating the degree to which water is recharged in the paddy field relative to the water intake point, based on the length of the path calculated by the groundwater path calculation unit and the permeability obtained by the permeability acquisition unit.

2. The information processing apparatus according to claim 1, comprising a groundwater level information acquisition unit that acquires groundwater level information indicating groundwater levels at multiple points in the region, wherein the total head surface information acquisition unit acquires total head surface information by calculating the total head surface based on the groundwater level information acquired by the groundwater level information acquisition unit.

3. The information processing apparatus according to claim 1 or 2, comprising a relief information acquisition unit that acquires relief information indicating the relief of the ground surface in the said region, wherein the total hydrohead surface information acquisition unit acquires total hydrohead surface information by calculating the total hydrohead surface based on the relief information acquired by the relief information acquisition unit.

4. The information processing apparatus according to claim 1 or 2, comprising: an elevation information acquisition unit that acquires elevation information indicating the elevation of the ground surface in the area; and a coefficient setting unit that sets a coefficient for weighting the permeability acquired by the permeability acquisition unit based on the elevation information acquired by the elevation information acquisition unit, wherein the recharge level calculation unit calculates the recharge level of the paddy field with respect to the water intake point based on the length of the path calculated by the groundwater path calculation unit, the permeability acquired by the permeability acquisition unit, and the coefficient set by the coefficient setting unit.

5. The information processing apparatus according to any one of claims 1 to 3, comprising: a paddy field information acquisition unit that acquires water depth information indicating the water depth of the paddy field; and a coefficient setting unit that sets a coefficient for weighting the permeability acquired by the permeability acquisition unit based on the water depth information acquired by the paddy field information acquisition unit, wherein the recharge calculation unit calculates the recharge of the paddy field with respect to the water intake point based on the length of the path calculated by the groundwater path calculation unit, the permeability acquired by the permeability acquisition unit, and the coefficient set by the coefficient setting unit.

6. The information processing apparatus according to any one of claims 1 to 3, comprising: a paddy field information acquisition unit that acquires area information indicating the area of ​​the paddy field; and a coefficient setting unit that sets a coefficient for weighting the permeability acquired by the permeability acquisition unit based on the area information acquired by the paddy field information acquisition unit, wherein the recharge rate calculation unit calculates the recharge rate of the paddy field with respect to the water intake point based on the length of the path calculated by the groundwater path calculation unit, the permeability acquired by the permeability acquisition unit, and the coefficient set by the coefficient setting unit.

7. The information processing apparatus according to any one of claims 1 to 3, comprising: a weather information acquisition unit for acquiring weather information relating to the weather in the said region; and a coefficient setting unit for setting coefficients for weighting the permeability acquired by the permeability acquisition unit based on the weather information acquired by the weather information acquisition unit, wherein the recharge calculation unit calculates the recharge of the paddy field with respect to the water intake point based on the length of the path calculated by the groundwater path calculation unit, the permeability acquired by the permeability acquisition unit, and the coefficient set by the coefficient setting unit.

8. The information processing apparatus according to any one of claims 1 to 3, comprising: a flow rate information acquisition unit that acquires flow rate information indicating the flow rate of a river in the area; and a coefficient setting unit that sets a coefficient for weighting the permeability acquired by the permeability acquisition unit based on the flow rate information acquired by the flow rate information acquisition unit, wherein the recharge calculation unit calculates the recharge of the paddy field with respect to the water intake point based on the length of the path calculated by the groundwater path calculation unit, the permeability acquired by the permeability acquisition unit, and the coefficient set by the coefficient setting unit.

9. The system includes a display control unit that displays an image on a display device, the position information acquisition unit acquires position information indicating the horizontal position of the water intake point, the first paddy field and the second paddy field which are paddy fields, the total head surface information acquisition unit acquires total head surface information indicating the total head surface of the region including the water intake point, the first paddy field and the second paddy field, the groundwater path calculation unit calculates a first groundwater path from the first paddy field to the water intake point and a second groundwater path from the second paddy field to the water intake point based on the total head surface information acquired by the total head surface information acquisition unit by applying the steepest descent method to the total head surface of the region, the permeability acquisition unit acquires the permeability in the first path calculated by the groundwater path calculation unit and the permeability in the second path calculated by the groundwater path calculation unit based on the soil information acquired by the soil information acquisition unit. The information processing apparatus according to any one of claims 1 to 8, characterized in that the recharge calculation unit calculates the recharge level of the first paddy field relative to the water intake point and the recharge level of the second paddy field relative to the water intake point based on the length of the first path and the length of the second path calculated by the groundwater path calculation unit and the permeability obtained by the permeability acquisition unit, and the display control unit causes the display device to display the recharge level of the first paddy field relative to the water intake point, the recharge level of the second paddy field relative to the water intake point, the location of the first paddy field, and the location of the second paddy field, which have been calculated by the recharge calculation unit.

10. An information processing method performed by an apparatus comprising: a location information acquisition unit; a total head surface information acquisition unit; a soil information acquisition unit; a groundwater path calculation unit; a permeability acquisition unit; and a recharge rate calculation unit, the method comprising: the location information acquisition unit acquiring location information indicating the horizontal position of the water intake point and the paddy field; the total head surface information acquisition unit acquiring total head surface information indicating the total head surface of a region including the water intake point and the paddy field, extending in a first direction along the horizontal direction and a second direction along the horizontal direction and perpendicular to the first direction; the soil information acquisition unit acquiring soil information relating to the attributes of the soil in the region; and the groundwater path calculation unit calculating the groundwater path from the paddy field to the water intake point based on the total head surface information acquired by the total head surface information acquisition unit by applying the steepest descent method to the total head surface of the region. An information processing method characterized by comprising: a step of the permeability acquisition unit acquiring the permeability in a path calculated by the groundwater path calculation unit based on soil information acquired by the soil information acquisition unit; and a step of the recharge rate calculation unit calculating a recharge rate indicating the degree to which water is recharged in the paddy field at the water intake point, based on the length of the path calculated by the groundwater path calculation unit and the permeability acquired by the permeability acquisition unit.

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