JP2020064427A - Sand-trap dam deposition amount calculating device, and control program - Google Patents

Abstract

To improve the accuracy of calculating the amount of earth-and-sand deposition by a sand-trap dam that is calculated on the basis of altitude information corresponding to a plurality of points arranged in rectangular lattice form on a planar map.SOLUTION: A deposition amount calculation device pertaining to the present invention calculates the points the ground surface altitude and top face altitude of which are equal on each of a plurality of X value lines and a plurality of Y value lines and which are higher than the levee crown altitude of a sand-trap dam scheduled to be installed, as borderline forming points. For each of a plurality of triangle meshes constituted by nearby three points out of a plurality of constituent points derived by projecting each of the intra-deposition area points, borderline forming points and dam forming points onto a planar map, the cubic volume of a three-dimensional shape constituted by the top face and ground surface and a vertical plane passing through each side of each triangular mesh is calculated. The total value of cubic volume of the three-dimensional shape calculated for each of the plurality of triangular meshes is calculated as the cubic volume of a deposition space and the cubic volume of the deposition space is displayed on a display unit.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a deposit control device for a sabo dam and a control program.

  The sabo dam is a facility for receiving the sediment and driftwood that flow from the upstream when a debris flow occurs, and adjusting the amount of water and sediment that flows downstream from the sabo dam. The erosion control dam prevents the river bottom and the river bank from being scraped and reduces the destructive force of debris flow by making the slope of the upstream river gentle by the sediment and driftwood accumulated upstream of the erosion control dam. It is possible to reduce.

  When planning the installation of erosion control dams, the planner sets the scope of consideration for the installation of erosion control dams, and captures the planned amount and plans based on the "Guideline for the formulation of basic erosion control plans (debris flow / driftwood countermeasures)". Investigate the positions that satisfy the conditions regarding the suppression amount. For example, Patent Document 1 describes a technique of GIS (Geographic Information System) that stores digital elevation data to simulate a sedimentation area when a sabo dam is installed.

JP, 2013-210600, A

  A conventional sediment control device for sabo dams using GIS uses numerical elevation data relating to elevations corresponding to a plurality of points arranged in a rectangular grid on a planar map as elevation information indicating the elevation of the ground surface. It was being done. In many cases, a plurality of points corresponding to such elevation information do not coincide with the boundary line of the sedimentation area, which may cause an error in the calculation result of the amount of sediment deposited by the erosion control dam.

  The present invention has been made to solve such a problem, and is calculated based on the elevation information corresponding to a plurality of points arranged in a rectangular grid on a planar map, such as sediment by a sabo dam The purpose is to improve the calculation accuracy of the accumulated amount.

  A deposit control device for a sabo dam according to the present invention displays an X value, a Y value, and an altitude of the ground surface defined by a display unit and a predetermined coordinate system of a plurality of points arranged in a rectangular grid on a planar map. Elevation information shown, the position of both ends of the upstream side of the crest of the sabo dam to be installed and the elevation and weir position information, and the slope of the top surface of the deposition space for sediment etc. by the sabo dam to be installed And a plurality of X-value lines passing through each point having the same X value among a plurality of points, and passing through each point having the same Y value among a plurality of points A plurality of Y-value lines for calculating an XY-ray calculation unit, and an altitude calculation unit that calculates the altitude of the upper surface of the deposition space corresponding to each of the plurality of points based on the dam position information and the gradient information, Of the above points, the elevation of the upper surface is higher than the elevation of the ground surface , The altitude of the ground surface on each line of the plurality of X-value lines and the plurality of Y-value lines based on the specific part specified as a point in the deposition area and the altitudes of the ground surface and the upper surface of each of the plurality of points. A point where the elevation of the top surface is equal and is higher than or equal to the elevation of the top of the sabo dam to be installed is calculated as a boundary line shape point, and the upstream side of the top in the length direction of the top and multiple X value lines and multiple A shape point calculation unit that calculates the intersection with the Y value line and both end points of the upstream side in the bank length direction of the crown as the dam shape point, and the accumulation area point, the boundary line shape point, and the dam shape point, respectively. A creation unit that creates a plurality of triangular meshes composed of three neighboring points of the plurality of constituent points projected on the planar map, and an upper surface, a ground surface, and each triangular mesh for each of the plurality of triangular meshes. With a vertical plane passing through the side The volume calculation unit configured to calculate the volume of the three-dimensional shape configured as described above, and the total value of the volume of the three-dimensional shape calculated for each of the plurality of triangular meshes as the volume of the deposition space, and the volume of the deposition space on the display unit. And a display processing unit for displaying.

  Further, in the deposit amount calculation device for a sabo dam according to the present invention, an acquisition unit for acquiring information about the lowest riverbed line input by the user and a closed region having a predetermined width perpendicular to the lowest riverbed line are calculated as the study range. It is preferable that a region calculation unit is further provided, and the elevation calculation unit, the XY-ray calculation unit, the shape point calculation unit, and the specification unit use a plurality of points within the study range.

  Further, in the deposit control apparatus for a sabo dam according to the present invention, the altitude of the ground surface indicated by the altitude information stored by the storage unit is based on the altitude measured by a laser profiler or the like, and the ground such as buildings and trees. It is preferable that the altitude of the ground surface is obtained by removing objects.

  A deposit control device for a sabo dam according to the present invention is a display unit, and altitude information indicating the X value, the Y value, and the altitude of the ground surface of each of a plurality of points arranged in a rectangular grid on a planar map, Weir position information that shows the position and elevation of both ends of the upstream side of the top of the sabo dam to be installed and the elevation, and the planned accumulation of sediment space corresponding to the planned capture amount of sediment etc. by the sabo dam to be installed. A storage unit that stores a sand gradient and gradient information indicating a normal sedimentation gradient, a plurality of X-value lines that pass through each point having the same X value among a plurality of points, and the same among a plurality of points Based on the XY-ray calculation unit that calculates a plurality of Y value lines passing through each point having a Y value, and the dam position information and the gradient information, the planned sediment of the deposition space corresponding to each of the plurality of points Elevation of the upper surface corresponding to the slope and normal accumulation of the deposition space An elevation calculation unit that calculates the elevation of the lower surface corresponding to the gradient, and a specific unit that identifies the point where the elevation of the upper surface is higher than the elevation of the ground surface as a point within the accumulation area among the multiple points, and each of the multiple points. Based on the elevation of the ground surface and the elevation of the upper surface, the elevation of the ground surface and the elevation of the upper surface are equal on the respective lines of the plurality of X-value lines and the plurality of Y-value lines and the elevation of the crown of the sabo dam to be installed The points above are calculated as boundary line shape points, and the intersection of the upstream side of the crown at the bank length direction and the plurality of X value lines and the plurality of Y value lines and the upstream of the crown at the bank length direction A shape point calculation unit that calculates both end points of the side as a dam shape point, and a neighborhood 3 of a plurality of constituent points obtained by projecting each of the accumulation area point, the boundary shape point, and the dam shape point on a planar map. Create multiple triangular meshes of points For each of the plurality of triangular meshes, a volume of a three-dimensional shape including an upper surface, a lower surface or a ground surface, and a vertical plane passing through each side of each triangular mesh is calculated, and the plurality of triangular meshes are calculated. And a display processing unit that displays the volume of the deposition space on the display unit.

  A control program according to the present invention is a control program that includes a storage unit and a display unit and that controls a computer for calculating the amount of sediment deposited by a sabo dam, and is arranged in a rectangular grid pattern on a planar map. Elevation information indicating the X value, Y value, and elevation of the ground surface at each of the plurality of points, and the position of both end points of the upstream side of the ridge end of the sabo dam to be installed and the elevation position information indicating the altitude. And a plurality of X-value lines that pass through each point having the same X-value among a plurality of points, by storing in the storage section the gradient information indicating the gradient of the upper surface of the accumulation space such as sediment due to the sabo dam to be installed. And a plurality of Y value lines passing through each point having the same Y value among the plurality of points, and based on the dam position information and the gradient information, the deposition space corresponding to each of the plurality of points is calculated. Calculate the altitude of the top surface and Of the points, the point where the elevation of the upper surface is higher than the elevation of the ground surface is specified as the point in the deposition area, and based on the elevation of the ground surface and the elevation of the upper surface of the plurality of points, a plurality of X-value lines and a plurality of X-ray lines On each of the Y value lines of the above, the point where the elevation of the ground surface and the elevation of the upper surface are equal and is equal to or higher than the elevation of the crown of the Sabo dam to be installed is calculated as the boundary line shape point, and the bank length of the crown is calculated. The intersection of the upstream side in the direction with the multiple X-value lines and the multiple Y-value lines, and the end points of the upstream side in the bank length direction at the top of the crown are calculated as dam shape points, and points within the accumulation area and boundary line shapes Create a plurality of triangular meshes composed of three points in the vicinity of the plurality of constituent points obtained by projecting each of the points and the dam shape points on a planar map, and regarding each of the plurality of triangular meshes, the upper surface and the ground surface. And each side of each triangular mesh The volume of the three-dimensional shape composed of the vertical plane passing through is calculated, the total value of the volumes of the three-dimensional shape calculated for each of the plurality of triangular meshes is calculated as the volume of the deposition space, and the volume of the deposition space is displayed on the display unit. Causes a computer to do what is displayed in.

  Deposition of sediment etc. by a sabo dam, which is calculated based on the elevation information corresponding to a plurality of points arranged in a rectangular grid on a plan map by the sabo dam deposition amount calculation device and control program according to the present invention. It is possible to improve the calculation accuracy of the quantity.

It is a figure which shows an example of a schematic structure of the deposit amount calculation apparatus 1. (A) And (b) is a figure which shows an example of the screen displayed on the display part 13. As shown in FIG. (A) And (b) is a figure which shows an example of the screen displayed on the display part 13. As shown in FIG. 6 is a diagram showing an example of a screen displayed on the display unit 13. FIG. (A) is a schematic diagram for explaining an example of the terrain shape point, and (b) is a schematic diagram for explaining an example of an X value line and a Y value line. It is a schematic diagram which shows an example of the calculation method of the altitude of the upper surface. It is a schematic diagram for demonstrating an example of the point in a deposition area. (A) is a schematic diagram for demonstrating an example of a boundary line shape point and a dam shape point, (b) is a schematic diagram for demonstrating an example of the calculation method of a boundary line shape point. (A) is a schematic diagram for explaining an example of a boundary line, and (b) is a schematic diagram for explaining an example of a method for creating a triangular mesh. It is a schematic diagram which shows an example of the calculation method of the volume of a cutting triangular prism. 6 is a diagram showing an example of a screen displayed on the display unit 13. FIG. It is a figure which shows an example of the operation flow of a deposit amount calculation process.

  Hereinafter, various embodiments of the present invention will be described with reference to the drawings. However, it should be noted that the technical scope of the present invention is not limited to those embodiments, but extends to the inventions described in the claims and their equivalents.

(Deposition amount calculation device 1)
FIG. 1 is a diagram showing an example of a schematic configuration of a deposition amount calculation device 1.

  The deposition amount calculation device 1 is, for example, a personal computer (PC) for supporting the plan of a sabo dam. The deposition amount calculation device 1 may be a server device. The deposition amount calculation device 1 may be a multifunctional mobile phone (so-called “smartphone”), a mobile phone (so-called “feature phone”), a mobile information terminal (Personal Digital Assistant, PDA), a tablet terminal, a tablet PC, or the like. Further, the accumulation amount calculation device 1 may be a portable game machine, a portable music player, a notebook PC, or the like.

  The deposition amount calculation device 1 stores elevation information, dam position information regarding the position of the top of the sabo dam to be installed, and gradient information indicating the slope of the upper surface of the deposition space such as sediment due to the sabo dam to be installed. .

  The elevation information is numerical elevation data used in GIS or the like. The digital elevation data is, for example, DEM (Digital Elevation Model, digital elevation model) data. The DEM data includes numerical data indicating the elevation values corresponding to the center points of the plurality of meshes that divide the two-dimensional map. The elevation value included in the DEM data is the elevation value of the ground surface measured by laser profiler (Laser Profiler, LP) or stereo matching of aerial photogrammetry. The mesh is a substantially square section on the map, which is divided according to the X value line and the Y value line. For example, the mesh is a section configured by dividing the map into a substantially square shape of 1 m unit. The shape of the sections forming the mesh is not limited to the substantially square shape of 1 m unit, but may be the substantially square shape of 5 m unit, the substantially square shape of 10 m unit, or the substantially square shape of the unit exceeding 10 m. The X value line and the Y value line are determined based on the predetermined X value and Y value, respectively. The X and Y values are determined by the coordinate system selected from the geographic coordinate system, the plane rectangular coordinate system, and the projected coordinate system of the UTM coordinate system, and the geodetic system selected from the world geodetic system and the Japanese geodetic system. To be In the embodiment of the present invention, an X value and a Y value defined by a plane rectangular coordinate system (eighth system) in the world geodetic system will be described below as an example.

  Further, the digital elevation data may be DTM (Digital Terrain Model) data. The DTM data is, for example, a data model that displays the height of the ground surface from which features such as buildings and trees are removed from the DEM data, and is a type of DEM data. The digital elevation data may be TIN (triangulated irregular network) data. The TIN data includes data on a virtual irregular triangular partition formed by connecting each of a plurality of points on the map with a nearby point, and each of the plurality of points. Numerical data indicating the altitude value corresponding to is included.

  The digital elevation data may be elevation / gradient mesh data. The elevation / inclination mesh data includes, for example, numerical data indicating elevation values (average value, maximum value and minimum value), numerical data indicating maximum inclination angle and direction, and minimum inclination angle in each mesh of DEM data. Numerical data indicating directions is included.

  The digital elevation data may be data corresponding to a predetermined area on the map. The predetermined area is, for example, an area divided by basin, an area divided by region (Kanto region, etc.), an area divided by prefecture, an area divided by municipality.

  The dam position information regarding the position of the crown of the sabo dam to be installed is based on the information input by the user of the deposition amount calculation device 1. The dam position information is, for example, information indicating the X value and the Y value and the altitude of both end points of the upstream side of the crest of the sabo dam to be installed in the bank length direction. The dam position information may be information indicating the X value and the Y value of the center of the upstream side of the crest of the sabo dam to be installed in the length direction, the altitude, and the crest length of the crest.

  The slope of the upper surface of the sedimentation space such as sediment due to the sabo dam to be installed is, for example, a planned sediment slope. The slope of the upper surface of the sedimentation space such as sediment due to the planned sabo dam may be a normal sedimentation slope. The gradient information indicating the gradient of the upper surface of the accumulation space such as sediment due to the sabo dam to be installed may be information input by the user.

  The sedimentation space of the planned sabo dam is the space that corresponds to the planned amount of traps stipulated in the "Guideline for Establishing a Basic Sabo Plan (Debris Flow / Driftwood Countermeasures)". The sedimentation space of sediments and the like due to the sabo dam that is scheduled to be installed may be a space that combines a sedimentation space where sediments and driftwood, etc. are constantly accumulated and a space corresponding to the planned capture amount. In addition, the sedimentation space of the sediment control dam, which is scheduled to be installed, may be a space in which a sedimentation space in which sediment, driftwood, etc. are constantly accumulated and a space corresponding to both the planned capture amount and the planned accumulation amount are combined. Hereinafter, sediment, driftwood, and the like deposited by the sabo dam may be referred to as “deposit”.

  When the elevation information is elevation data in mesh units such as DEM data or DTM data, the elevation information includes X values, Y values and elevations of the ground surface corresponding to the center points of the plurality of meshes. . The center points of the plurality of meshes are arranged in a rectangular grid on the planar map. For example, when the mesh has a substantially square shape with a unit of 1 m, the center points of the plurality of meshes are respectively the plurality of X value lines set at intervals of about 1 m and the plurality of Y values set at intervals of about 1 m. Located at the intersection with each of the lines. Hereinafter, the center point of the mesh with which the altitude information is associated may be referred to as a terrain shape point.

  The deposition amount calculation device 1 calculates a plurality of X value lines and a plurality of Y value lines that pass through each of the plurality of topographical shape points based on the altitude information. Further, the deposition amount calculation device 1 calculates the altitude of the upper surface of the deposition space corresponding to each of the plurality of topographical shape points, based on the dam position information and the gradient information.

  The deposition amount calculation device 1 identifies a point, of the plurality of topographical shape points, having a higher altitude on the upper surface than an altitude on the ground surface as a point in the deposition area. The altitude of the ground surface is the altitude corresponding to the terrain shape point indicated by the altitude information.

  The deposition amount calculation device 1 is based on the elevation of the ground surface and the elevation of the upper surface of each of the plurality of topographical shape points, and the elevation of the ground surface and the elevation of the upper surface are equal on each line of the plurality of X value lines and are planned to be installed. The point above the altitude of the top of the Sabo dam is calculated as the boundary shape point. Of the two topographical points that are adjacent to each other on one X-value line, the elevation of the ground surface is higher than the elevation of the upper surface at one point shape point and the elevation of the upper surface is higher than the elevation surface of the ground at the other point shape point. If is higher, the boundary line shape point is located on the X-value line connecting the two topographical shape points. The details of the method of calculating the boundary line shape points will be described later. In addition, the deposition amount calculation device 1 determines that the ground surface elevation and the top surface elevation are equal on each of the plurality of Y value lines based on the ground surface elevation and the top surface elevation of each of the plurality of topographical shape points. The point above the altitude of the top of the Sabo dam to be installed is calculated as the boundary shape point.

  The accumulation amount calculation device 1 defines an intersection of an upstream side in the bank length direction of the crown and a plurality of X value lines and a plurality of Y value lines, and both end points of the upstream side of the crown in the bank length direction. Calculate as a dam shape point.

  The deposition amount calculation device 1 creates a plurality of triangular meshes composed of three neighboring points among a plurality of constituent points obtained by projecting each of the deposition area inside point, the boundary line shape point, and the dam shape point on a planar map. To do. Similar to the TIN data, the triangular mesh has a virtual irregular triangular shape formed by connecting each constituent point to a neighboring constituent point with a line segment, and each side of the triangular mesh is It does not intersect each side of the other triangular mesh.

  The deposition amount calculation device 1 calculates, for each of the plurality of triangular meshes, the volume of a three-dimensional shape formed by the upper surface, the ground surface, and the vertical plane that passes through each side of each triangular mesh. The three-dimensional shape is a shape of a cut triangular prism that is divided by a top surface and a ground surface from a triangular prism whose bottom is a triangular mesh.

  The deposition amount calculation device 1 calculates the total value of the volumes of the three-dimensional shapes calculated for each of the plurality of triangular meshes as the volume of the deposition space, and displays the calculated volume of the deposition space.

  The deposition amount calculation device 1 includes, for example, a storage unit 11, an operation unit 12, a display unit 13, and a processing unit 14 in order to realize the functions described above.

  The storage unit 11 includes at least one of a semiconductor memory device such as a ROM (Read Only Memory) and a RAM (Random Access Memory), a magnetic tape device, a magnetic disk device, or an optical disk device. The storage unit 11 stores an operating system program, a driver program, a control program, data and the like used in the processing of the processing unit 14. The driver programs stored in the storage unit 11 are an input device driver program that controls the operation unit 12, an output device driver program that controls the display unit 13, and the like. The control program stored in the storage unit 11 is an application program or the like for executing the accumulation amount calculation process of the sabo dam. The various programs stored in the storage unit 11 may be installed in the storage unit 11 from a computer-readable portable recording medium such as a CD-ROM or a DVD-ROM using a known setup program or the like. The data stored in the storage unit 11 is altitude information and various information input by the user. The storage unit 11 may also temporarily store temporary data related to a predetermined process.

  The operation unit 12 is, for example, a keyboard, a mouse, or a pointing device such as a touch panel. The user can input characters, numbers and symbols, or a position on the display screen of the display unit 13 using the operation unit 12. When operated by the user, the operation unit 12 generates a signal corresponding to the operation. Then, the generated signal is supplied to the processing unit 14 as a user's instruction.

  The display unit 13 is a liquid crystal display. The display unit 13 may be an organic EL (Electro-Luminescence) display or the like. The display unit 13 displays an image according to the image data supplied from the processing unit 14, an image according to the image data, and the like.

  The processing unit 14 includes one or more processors and their peripheral circuits. The processing unit 14 centrally controls the overall operation of the deposition amount calculation device 1, and is, for example, a CPU (Central Processing Unit). The processing unit 14 executes various types of information processing in an appropriate procedure based on the programs stored in the storage unit 11 and various instructions input according to the operation of the operating unit 12 by the user, and the display unit 13 to control the operation. The processing unit 14 executes various types of information processing based on the operating system program, the driver program, and the control program stored in the storage unit 11. Moreover, the processing unit 14 can execute a plurality of programs in parallel.

  The processing unit 14 includes at least a display processing unit 141, an acquisition unit 142, and a calculation unit 143. Each of these units is a functional module implemented by a program executed by a processor included in the processing unit 14. Alternatively, each of these units may be implemented as firmware in the deposition amount calculation device 1.

  Hereinafter, an example of various screens displayed on the display unit 13 of the deposition amount calculation device 1 will be described with reference to FIGS. 2-4 and 11, and an example of a deposition amount calculation method will be described with reference to FIGS. Will be described.

(Map screen 200)
FIG. 2A is a diagram showing an example of the map screen 200 displayed on the display unit 13 of the deposition amount calculation device 1.

  The map screen 200 is displayed, for example, when the control program for executing the deposit amount calculation processing of the sabo dam according to the present embodiment is activated in accordance with the start instruction input according to the operation of the operation unit 12 by the user. It The start instruction is input, for example, when a start icon or the like indicating the control program displayed on the display unit 13 is designated according to the operation of the operation unit 12 by the user.

  The map screen 200 shown in FIG. 2A includes a map image based on the altitude information in the predetermined area stored in the storage unit 11. When a plurality of arbitrary points on the map screen 200 are sequentially input according to the operation of the operation unit 12 by the user, the display processing unit 141 of the deposition amount calculation device 1 connects the input points in order. The generated vector data is generated, and the line segment based on the generated vector data is superimposed on the map screen and displayed on the display unit 13. The vector data includes data indicating the X value and Y value of the first input point, data indicating the X value and Y value of the second and subsequent input points, and the last input point. And data showing X and Y values.

  In the example shown in FIG. 2A, vector data based on a plurality of points input by the user is generated, and the lowest riverbed line 201 indicated by the generated vector data is displayed in a superimposed manner on the map screen. The lowest riverbed line is, for example, a mountain stream line or a valley line. The vector data indicating the lowest riverbed line 201 indicates the respective X and Y values of the first input point 201a, the second and subsequent input points, and the last input point 201b. Contains data. The deposition amount calculation device 1 recognizes that the first input point 201a is the downstream side point of the lowest riverbed line 201, and the last input point 201b is the upstream side point of the lowest riverbed line 201. recognize. The deposit amount calculation device 1 recognizes that the input points are upstream points as the input order is later.

(Setting screen 210)
FIG. 2B is a diagram showing an example of the setting screen 210 displayed on the display unit 13 of the deposition amount calculation device 1. The display processing unit 141 displays the setting screen 210 on the display unit 13 in response to a setting screen display instruction from the user.

  The setting screen 210 is a screen for the user to input the type of sabo dam and the setting value regarding the sabo dam, and includes a type selection object 211, a dam setting object 212, and a setting object 213.

  The type selection object 211 is an operation object for selecting one of a plurality of types related to the sabo dam. In the type selection object 211 shown in FIG. 2B, a plurality of button type objects and character information (“transmissive type”, “opaque type”, which indicates the type of erosion control dam corresponding to each of the plurality of objects, And “partially transmissive” and the like).

  When the input position on the setting screen 210 input according to the operation of the operation unit 12 by the user is within any of the display areas of the button type objects included in the type selection object 211, the button corresponding to the input position The type object is changed to a display mode indicating that it has been selected. Further, when the input position on the setting screen 210 input according to the operation of the operation unit 12 by the user is within any display area of the character information indicating the type of the sabo dam included in the type selection object 211. The button type object of the character information corresponding to the input position is changed to a display mode indicating that it has been selected.

  The dam setting object 212 is an input object for inputting a setting value regarding the erosion control dam. The input object is, for example, a text input box. When a numerical value is input to the dam setting object 212 by the operation of the operation unit 12 by the user, the input numerical value is displayed in the dam setting object 212. In the example shown in FIG. 2B, the dam setting objects 212 corresponding to the current riverbed slope, the normal sedimentation slope, the planned sedimentation slope, and the weir height are displayed.

  For example, when the user inputs the numerical value “0.1” to the dam setting object 212 corresponding to the current river bed slope, the numerical value “0.1” is displayed in the dam setting object 212 as the current river bed slope. It

  The setting value corresponding to the dam setting object 212 may be something other than the current riverbed slope, normal sedimentation slope, planned sedimentation slope, and dike height (for example, dike length), and the current riverbed slope and normal sedimentation. It may be part of the slope, the planned sedimentation slope, and the height of the dam.

  The setting object 213 is a button object for determining the selection of the type of sabo dam. The setting object 213 may be an icon image, text, or the like. When the input position on the setting screen 210 input according to the operation of the operation unit 12 by the user is within the display area of the setting object 213, the setting information is input to the deposition amount calculation device 1. The setting information includes type data indicating the type of sabo dam corresponding to the selected button type object, and setting data indicating the setting value corresponding to the dam setting object 212 input by the user. In this way, when the user performs an operation of selecting the setting object 213, the acquisition unit 142 of the deposition amount calculation device 1 causes the sabo dam entered by the user and the type data indicating the type of the sabo dam selected by the user. The setting information including the setting data indicating the setting value regarding is acquired.

(Map screen 300)
FIG. 3A is a diagram showing an example of the map screen 300 displayed on the display unit 13 of the deposition amount calculation device 1.

  The map screen 300 shown in FIG. 3A is a screen in which the mark 301 of the installation candidate position on the lowest riverbed 201 is superimposed on the map screen 200 shown in FIG. The installation candidate position corresponds to the X value and the Y value on the lowest riverbed line 201, and the mark 301 shown in FIG. 2A is displayed at the installation candidate position.

  When the user specifies an arbitrary position on the map screen 200 shown in FIG. 2, the acquisition unit 142 of the deposition amount calculation device 1 is the closest to the position specified by the user among the positions on the lowest riverbed line 201. The position is acquired as the installation candidate position. The display processing unit 141 of the deposition amount calculation device 1 displays the mark 301 on the set installation candidate position.

(Map screen 310)
FIG. 3B is a diagram showing an example of the map screen 310 displayed on the display unit 13 of the deposition amount calculation device 1.

  The map screen 310 shown in FIG. 3B is a screen in which a top end graphic 311 showing the top end of the sabo dam corresponding to the installation candidate position is superimposed on the map screen 300 shown in FIG. 3A. The display processing unit 141 of the deposition amount calculation device 1 sets the crown figure so that the center of the upstream side in the bank length direction of the crown indicated by the crown figure 311 becomes the installation candidate position (position of the mark 301). 311 is displayed on the map screen 310. The top end figure 311 may be displayed on the map screen 310 so that the center of the downstream side of the top end indicated by the top end figure 311 in the bank length direction is the installation candidate position (position of the mark 301).

  The length of the crown pattern 311 in the longitudinal direction (the crown length direction of the crown) is calculated based on the setting value regarding the erosion control dam included in the input setting information. For example, the display processing unit 141 of the deposition amount calculation device 1 refers to the altitude information stored in the storage unit 11, and is included in the input setting information and the altitude corresponding to the topographical shape point closest to the installation candidate position. Calculate the sum of the height of the dam and the height of the crown.

  The display processing unit 141 of the deposition amount calculation device 1 generates a line segment that is perpendicular to the lowest riverbed line 201 on the map plane at the installation candidate position. The length of the generated line segment is the length up to the position where it is estimated that the generated line segment is in contact with the ground surface when the generated line segment is the altitude of the top. Note that the display processing unit 141 refers to the altitude information, arranges a plurality of topographical shape points in a three-dimensional virtual space based on the X value, the Y value, and the altitude value of the plurality of topographical shape points, and the adjacent three The ground surface is calculated by generating a plurality of triangular polygons formed by one terrain shape point without a gap.

  The display processing unit 141 of the deposition amount calculation device 1 sets the line segment generated as described above as the upstream side of the crown at the bank length direction. The display processing unit 141 may set the line segment generated as described above as the downstream side of the crown at the bank length direction. The crown figure 311 shown in FIG. 3B has the same length as the upstream side in the bank length direction of the crown and the upstream side that is installed downstream from the upstream side by a predetermined ceiling width. And a downstream side of the rectangular shape.

(Map screen 400)
FIG. 4 is a diagram showing an example of a map screen 400 displayed on the display unit 13 of the deposition amount calculation device 1.

  The map screen 400 shown in FIG. 4 is a screen in which the study range 401 is superimposed on the map screen 310 shown in FIG. 3B. The study range is automatically generated by the deposition amount calculation device 1 based on the lowest riverbed line 201. For example, the display processing unit 141 of the deposition amount calculation device 1 sets the examination range data in which the examination range data is a closed area having a predetermined width (about 400 m or the like) centered on the lowest riverbed line 201 and perpendicular to the lowest riverbed line 201. Calculate automatically.

(Point shape point)
When the study range data is calculated, the acquisition unit 142 of the deposition amount calculation device 1 refers to the altitude information and extracts the topographical shape points within the study range indicated by the study range data. FIG. 5A is a schematic diagram for explaining an example of the extracted topographical shape points.

  The deposition amount calculation device 1 extracts the topographical shape points within the study range, and uses only the extracted topographical shape points in the subsequent deposition amount calculation processing. As a result, it is possible to improve the speed of the arithmetic processing of the deposition amount calculation device 1.

  As shown in FIG. 5A, the plurality of topographical shape points are arranged in a rectangular grid on the planar map. The deposits of the sabo dam are deposited on the upstream side of the lowest riverbed line 201 of the crown figure 311, but there are topographical points that do not match the upstream side of the crown figure 311. An error occurs in the calculation result of the volume of the volume space near the upstream side.

(X value line and Y value line)
FIG. 5B is a schematic diagram for explaining an example of the X value line and the Y value line. The plurality of terrain shape points are located at the intersections of the plurality of X value lines set at the same intervals and the plurality of Y value lines set at the same intervals. The calculation unit 143 of the deposition amount calculation device 1 specifies the X value and Y value information of each of the plurality of topographical shape points, and calculates the X value line based on the specified X value information and the specified Y value information. The returning Y value line is calculated.

(Elevation of the upper surface of the deposition space)
FIG. 6 is a schematic diagram showing an example of a method of calculating the elevation of the upper surface of the deposition space for each of the plurality of topographical shape points.

  The calculation unit 143 of the accumulation amount calculation device 1 includes a plurality of topographical shape points on a plane (upper surface) that includes the upstream side in the bank length direction of the crown and has the planned sedimentation slope included in the input setting information. Calculate the altitude of each. Note that the calculation unit 143 divides the study range into two regions by a straight line including the upstream side, refers to each point on the lowest riverbed line 201, and sets the installation candidate position of the two divided regions. The upstream area is determined from. For example, the calculation unit 143 calculates the shortest distance h between each of the plurality of topographical shape points on the upstream side and the upstream side of the top end in the bank length direction, and for each of the plurality of topographical shape points, “(top end (Altitude) + (shortest distance h) × (planning sediment slope) ”, and the calculation result is the elevation of the upper surface of the deposition space for each of the plurality of topographical shape points. Alternatively, the shortest distance h is the minimum riverbed line 201 between the point obtained by moving a plurality of upstream terrain shape points on the lowest riverbed line 201 in the shortest distance direction with respect to the lowest riverbed line 201 and the installation candidate position. Good as the distance above.

(Points in deposition area)
FIG. 7 is a schematic diagram for explaining an example of points in the accumulation area.

  The calculation unit 143 identifies a point, of the plurality of topographical shape points, having a higher elevation on the upper surface than the elevation on the ground surface as a point in the deposition area. The altitude of the ground surface is the altitude of the terrain shape point indicated by the altitude information.

(Weir shape point and boundary line shape point)
FIG. 8A is a schematic diagram for explaining an example of a dam shape point and a boundary line shape point.

  As shown in FIG. 8 (a), the dam shape point has the X value or the Y value indicated by either the X value line or the Y value line among the points on the upstream side of the crown end in the bank length direction. It is a point to have. For example, the calculation unit 143 identifies the X value and the Y value at both end points of the upstream side of the crown at the bank length direction. The calculation unit 143 calculates a line segment connecting the both end points on the planar map based on the specified X value and Y value of the both end points, and the calculated line segment and a plurality of X value lines and a plurality of Y value lines. Calculate the X value and the Y value at the intersection with and. The calculating unit 143 sets a point on the upstream side of the crown end in the bank length direction corresponding to the calculated X value and Y value of the intersection as a dam shape point. The elevation of the upper surface of the dam shape point is the elevation of the crown, and the elevation of the lower surface is calculated based on the elevation of the ground surface of the nearby terrain shape point. The dam shape point includes both end points of the upstream side of the crown at the bank length direction.

  As shown in FIG. 8A, the boundary line shape point is one of the two topographical shape points adjacent to each other on one X value line or one Y value line, and the ground surface elevation is one of the point shape points. When the altitude of the upper surface is higher than the altitude of the upper surface and the altitude of the upper surface is higher than the altitude of the ground surface at the other point shape point, the point is located on the X value line or the Y value line connecting the two topographical shape points.

(Calculation method of boundary line shape points)
FIG. 8B is a schematic diagram for explaining an example of the calculation method of the boundary line shape points.

  As shown in FIG. 8B, the calculation unit 143 of the deposition amount calculation device 1 calculates the coordinates on the upper surface and the coordinates on the ground surface for each topographical shape point. Of the two topographical shape points that are adjacent to each other on the X-value line or the Y-value line, the calculating unit 143 determines that one of the point shape points has a higher ground surface elevation than the upper surface and the other point shape point has the upper surface. Those with an altitude higher than that of the ground surface are extracted. The calculation unit 143 calculates, as boundary line shape points, an intersection of a line segment connecting the two topographical shape points and a line segment connecting the points on the upper surface corresponding to the two topographical shape points.

  In the example illustrated in FIG. 8B, the calculation unit 143 sets the ground surface coordinates (X2, Y1, Zb3) at the point 3 and the ground surface coordinates (X2, Y2, Zb4) at the point 4 as the coordinates of the two topographical shape points. ) Is extracted. Then, the calculation unit 143 connects the line segment connecting the ground surface coordinates (X2, Y1, Zb3) of the point 3 and the ground surface coordinates (X2, Y2, Zb4) of the point 4 with the top surface coordinates (X2, Y1,) of the point 3. Za3) and the intersection with the upper surface coordinates (X2, Y2, Za4) of the point 4 are calculated as boundary line shape points.

(border)
FIG. 9A is a schematic diagram for explaining an example of the boundary line.

  The boundary line is a line segment that connects the boundary line shape point and the end points of the upstream side that are close to each other. The boundary line and the upstream side edge define the deposition area on the upper surface.

(How to create a triangular mesh)
FIG. 9B is a schematic diagram for explaining an example of a method for creating a triangular mesh.

  The triangular mesh is a triangular polygon composed of three points in the vicinity of a plurality of constituent points obtained by projecting each of the points in the accumulation area, the boundary shape points, and the dam shape points on a plan map. For example, the calculation unit 143 of the deposition amount calculation device 1 specifies the X value and the Y value of each of the accumulation area point, the boundary line shape point, and the dam shape point, and is indicated by the specified plurality of X values and Y values. Points on the planar map are specified as constituent points. The calculation unit 143 creates a group of three neighboring points among the identified constituent points. A triangular mesh is created from the three constituent points that make up each group. Note that each side of the triangular mesh does not intersect each side of the other triangular mesh.

(Calculation method of the volume of the cutting triangular prism)
FIG. 10 is a schematic diagram showing an example of a method of calculating the volume of the cut triangular prism.

  The calculation unit 143 of the deposition amount calculation device 1 calculates, for each of the plurality of triangular meshes, the volume of a three-dimensional shape including the upper surface, the ground surface, and the vertical plane that passes through each side of each triangular mesh. As shown in FIG. 10, the three-dimensional shape is a shape of a cut triangular prism that is divided by a top surface and a ground surface from a triangular prism whose base is a triangular mesh. In FIG. 10, points A, B, and C are points on the ground surface corresponding to the constituent points of the triangular mesh, and points D, E, and F correspond to the constituent points of the triangular mesh. It is a point on the top surface. The distance a in FIG. 10 is the shortest distance between the ground surface and the top surface at each constituent point of the triangular mesh. The calculating unit 143 cuts the cutting triangular prism into two three-dimensional elements by the triangle GEH that is a triangle GEH parallel to the triangle ABC and is moved by a distance a from the triangle ABC in the height direction, and cuts the three-dimensional element into two three-dimensional elements. Let the total value of be the volume of the three-dimensional shape ABC-DEF.

  The calculation unit 143 calculates the volume of the three-dimensional shape (cut triangular prism) corresponding to all the triangular meshes, and calculates the total value as the volume of the deposition space.

(Map screen 1100)
FIG. 11 is a diagram showing an example of the map screen 1100 displayed on the display unit 13 of the deposition amount calculation device 1.

  As shown in FIG. 11, the display processing unit 141 of the deposition amount calculation device 1 displays, on the map screen 400 shown in FIG. 4, the deposition region 1101 and the deposition amount 1102 of the deposition space when a sabo dam is installed on the display unit 13. To display. The deposition area 1101 is defined by the boundary line and the upstream side.

(Deposition amount calculation process)
FIG. 12 is a diagram showing an example of an operation flow of the deposition amount calculation processing by the display processing unit 141, the acquisition unit 142, and the calculation unit 143 of the deposition amount calculation device 1. The deposit amount calculation process is executed mainly by the processing unit 14 in cooperation with each element of the deposit amount calculation device 1 based on a control program stored in the storage unit 11 in advance.

  First, according to the operation of the operation unit 12 by the user, the display processing unit 141 reads out the digital elevation data from the storage unit 11 and displays the map screen 200 on the display unit 13 (step S101). For example, the display processing unit 141 displays contour lines by connecting the center points having substantially the same altitude value with a straight line or a curve based on the numerical value data indicating the altitude value included in the read numerical altitude data.

  First, when a plurality of arbitrary points are sequentially input on the map screen 200 according to the operation of the operation unit 12 by the user, the acquisition unit 142 generates vector data in which the input points are sequentially connected. Then, the generated vector data is acquired as the minimum riverbed line data (step S102). The display processing unit 141 superimposes and displays the lowest riverbed line 201 on the map screen 200 based on the generated lowest riverbed line data. The display processing unit 141 may store the minimum riverbed line data in the storage unit 11. In this case, the display processing unit 141 reads the lowest riverbed line data stored in the storage unit 11 according to the operation of the operation unit 12 by the user, and maps the lowest riverbed line 201 based on the read lowest riverbed line data. It is displayed in a superimposed manner on the screen 200.

  Next, when the user performs an operation of selecting the setting object 213, the acquisition unit 142 acquires the setting information (step S103).

  Next, when a plurality of arbitrary points on the map screen 200 are input according to the operation of the operation unit 12 by the user, the acquisition unit 142 determines the highest position among the positions on the lowest riverbed line 201 from the position specified by the user. A close position is acquired as an installation candidate position (step S104).

  Next, the display processing unit 141 displays the crown figure 311 on the display unit 13 based on the installation candidate position and the altitude information and setting information (step S105).

  Next, the display processing unit 141 automatically calculates study range data in which a study area is a closed region centered on the lowest riverbed line 201 and having a predetermined width (about 400 m, etc.) perpendicular to the lowest riverbed line 201. Then, the examination range is displayed on the map screen 310 (step S106).

  Next, the acquisition unit 142 refers to the altitude information and extracts the topographical shape points within the study range indicated by the study range data (step S107).

  Next, the calculation unit 143 specifies the information of the X value and the Y value of each of the plurality of terrain shape points, and returns the X value line based on the information of the specified X value and the information of the specified Y value. A value line is calculated (step S108).

  Next, the calculation unit 143 calculates the altitude of the upper surface of the deposition space for each of the plurality of topographical shape points (step S109).

  Next, the calculation unit 143 calculates the point in the deposition area, the boundary line shape point, and the dam shape point based on the altitude information, the dam shape point, and the altitude of the upper surface of the deposition space (step S110).

  Next, the calculation unit 143 generates a triangular mesh based on the accumulation area point, the boundary shape point, and the dam shape point (step S111).

  Next, the calculation unit 143 calculates the volume of the deposition space based on the triangular mesh, the altitude information, and the altitude of the upper surface of the deposition space (step S112). Note that the calculation unit 143 may exclude the calculated volume of the deposition space from overlapping the shape of the dam according to the structure of the dam.

  The display processing unit 141 of the deposition amount calculation device 1 displays the deposition area 1101 of the deposition space and the deposition amount 1102 (volume of the deposition space) of the deposition space when the sabo dam is installed on the display unit 13 (step S113), and executes the processing. finish.

  As described above in detail, in the deposition amount calculation device 1 according to the present embodiment, even when the altitude information corresponding to a plurality of points arranged in a rectangular grid on the planar map is used, It is possible to improve the calculation accuracy of the amount of sediment and the like deposited.

(Modification 1)
The present invention is not limited to this embodiment. For example, when “transmissive type” or “partial transmissive type” is selected on the setting screen 210, the calculation unit 143 calculates the volume of the deposition space based on the method of calculating the deposition amount corresponding to each type.

(Modification 2)
Further, the volume of the deposition space may be the planned capture amount. In this case, the calculation unit 143 includes each of the plurality of topographical shape points on the plane (lower surface) that includes the upstream side in the bank length direction of the crown and has the normal sedimentation slope included in the input setting information. Calculate the altitude. Then, for each of the plurality of triangular meshes, the calculation unit 143 calculates the volume of the three-dimensional shape formed by the upper surface, the ground surface or the lower surface, whichever is higher, and the vertical plane that passes through each side of each triangular mesh. calculate. That is, the calculation unit 143 sets the points A, B, and C in FIG. 10 as the higher point of the ground surface or the lower surface corresponding to each constituent point of the triangular mesh. As a result, the deposition amount calculation device 1 can calculate the planned capture amount.

  It will be appreciated by those skilled in the art that various changes, substitutions and modifications can be made thereto without departing from the spirit and scope of the invention.

DESCRIPTION OF SYMBOLS 1 Accumulation amount calculation device 11 Storage part 12 Operation part 13 Display part 14 Processing part 141 Display processing part 142 Acquisition part 143 Calculation part

Claims (5)

Display part,
Elevation information indicating the X value, Y value, and elevation of the ground surface determined by a predetermined coordinate system of a plurality of points arranged in a rectangular grid on the plan map, and the length direction of the crown of the Sabo dam to be installed A storage unit that stores the dam position information indicating the positions and elevations of both end points of the upstream side of, and the slope information indicating the slope of the upper surface of the sediment space such as sediment by the sabo dam scheduled to be installed,
Calculate a plurality of X value lines passing through each of the plurality of points having the same X value, and a plurality of Y value lines passing through each of the plurality of points having the same Y value. An XY-ray calculation unit,
An elevation calculation unit that calculates the elevation of the upper surface of the deposition space corresponding to each of the plurality of points based on the dam position information and the gradient information,
Of the plurality of points, a specifying unit that specifies a point where the altitude of the upper surface is higher than the altitude of the ground surface, as a point in the deposition area,
Based on the elevation of the ground surface and the elevation of the upper surface of each of the plurality of points, the elevation of the ground surface and the elevation of the upper surface on the respective lines of the plurality of X value lines and the plurality of Y value lines are The points that are equal and are higher than or equal to the altitude of the crown of the sabo dam to be installed are calculated as boundary line shape points, and the upstream side of the crown at the bank length direction, the plurality of X value lines, and the plurality of Ys. A shape point calculation unit that calculates the intersection with the value line and both end points of the upstream side in the bank length direction of the top end as a dam shape point,
A creation unit that creates a plurality of triangular meshes composed of three neighboring points of a plurality of constituent points obtained by projecting each of the point in the accumulation area, the boundary line shape point, and the dam shape point on the planar map. When,
For each of the plurality of triangular meshes, the volume of a three-dimensional shape composed of the upper surface, the ground surface, and a vertical plane that passes through each side of each triangular mesh is calculated, and the volume calculated for each of the plurality of triangular meshes is calculated. A total value of the volume of the shape, a volume calculation unit for calculating the volume of the deposition space,
A display processing unit for displaying the volume of the deposition space on the display unit;
An apparatus for calculating the amount of sedimentation of a sabo dam, comprising: An acquisition unit that acquires information about the lowest riverbed line entered by the user,
An area calculation unit that calculates a closed area having a predetermined width perpendicular to the lowest riverbed line as an examination range,
The deposition control device for a sabo dam according to claim 1, wherein the elevation calculation unit, the XY-ray calculation unit, the shape point calculation unit, and the specification unit use the plurality of points within the examination range.   The altitude of the ground surface indicated by the altitude information stored by the storage unit is an altitude of the ground surface from which features such as buildings and trees have been removed, based on the altitude measured by a laser profiler or the like. Item 1. A device for calculating the amount of deposition of a sabo dam according to item 1 or 2. Display part,
Elevation information indicating the X value, Y value, and elevation of the ground surface determined by a predetermined coordinate system of a plurality of points arranged in a rectangular grid on the plan map, and the length direction of the crown of the Sabo dam to be installed Information on the position of both ends of the upstream side of the river and the height of the dam, and the slope of the planned sedimentation slope and the normal sedimentation slope of the sedimentation space corresponding to the planned amount of earth and sand captured by the sabo dam to be installed. A storage unit that stores information and
Calculate a plurality of X value lines passing through each of the plurality of points having the same X value, and a plurality of Y value lines passing through each of the plurality of points having the same Y value. An XY-ray calculation unit,
Based on the dam position information and the gradient information, corresponding to each of the plurality of points, the elevation of the upper surface corresponding to the planned sedimentation gradient of the deposition space, and the normal sedimentation gradient of the deposition space An elevation calculation unit that calculates the elevation of the lower surface,
Of the plurality of points, a specifying unit that specifies a point where the altitude of the upper surface is higher than the altitude of the ground surface, as a point in the deposition area,
Based on the elevation of the ground surface and the elevation of the upper surface of each of the plurality of points, the elevation of the ground surface and the elevation of the upper surface on the respective lines of the plurality of X value lines and the plurality of Y value lines are The points that are equal and are higher than or equal to the altitude of the crown of the sabo dam to be installed are calculated as boundary line shape points, and the upstream side of the crown at the bank length direction, the plurality of X value lines, and the plurality of Ys. A shape point calculation unit that calculates the intersection with the value line and both end points of the upstream side in the bank length direction of the top end as a dam shape point,
A creation unit that creates a plurality of triangular meshes composed of three neighboring points among a plurality of constituent points obtained by projecting each of the point in the accumulation area, the boundary line shape point, and the dam shape point on the planar map. When,
For each of the plurality of triangular meshes, calculate the volume of a three-dimensional shape composed of the upper surface, the lower surface or the ground surface, and a vertical plane that passes through each side of each triangular mesh, and calculate the volume of the plurality of triangular meshes. A total value of the volume of the three-dimensional shape calculated for each, a volume calculation unit that calculates as the volume of the deposition space,
A display processing unit for displaying the volume of the deposition space on the display unit;
An apparatus for calculating the amount of sedimentation of a sabo dam, comprising: A control program that includes a storage unit and a display unit and that controls a computer for calculating the amount of sediment, etc., deposited by a sabo dam.
Elevation information indicating the X-value, Y-value, and elevation of the ground surface determined by the respective predetermined coordinate systems of a plurality of points arranged in a rectangular grid pattern on the plan map, and the ridge at the crown of the sabo dam to be installed Storm position information indicating the positions and elevations of both end points of the upstream side in the longitudinal direction, and gradient information indicating the slope of the upper surface of the accumulation space such as sediment due to the planned sabo dam are stored in the storage unit,
Calculate a plurality of X value lines passing through each of the plurality of points having the same X value, and a plurality of Y value lines passing through each of the plurality of points having the same Y value. Then
Based on the dam position information and the gradient information, calculating the elevation of the upper surface of the deposition space corresponding to each of the plurality of points,
Among the plurality of points, a point where the elevation of the upper surface is higher than the elevation of the ground surface is specified as a point in the deposition area,
Based on the elevation of the ground surface and the elevation of the upper surface of each of the plurality of points, the elevation of the ground surface and the elevation of the upper surface on the respective lines of the plurality of X value lines and the plurality of Y value lines are The points that are equal and are higher than or equal to the altitude of the crown of the sabo dam to be installed are calculated as boundary line shape points, and the upstream side of the crown at the bank length direction, the plurality of X value lines, and the plurality of Ys. The intersection point with the value line and both end points of the upstream side in the bank length direction of the crown are calculated as dam shape points,
Creating a plurality of triangular meshes composed of three points in the vicinity of the plurality of constituent points obtained by projecting each of the accumulation area point, the boundary line shape point, and the dam shape point on the planar map,
For each of the plurality of triangular meshes, the volume of a three-dimensional shape composed of the upper surface, the ground surface, and a vertical plane that passes through each side of each triangular mesh is calculated, and the volume calculated for each of the plurality of triangular meshes is calculated. The total value of the volume of the shape is calculated as the volume of the deposition space,
Displaying the volume of the deposition space on the display unit,
A control program for causing the computer to execute the above.

Images