JP5873941B1 - Water damage analysis apparatus and water damage analysis method - Google Patents

Abstract

The present invention is to systematically and automatically generate a topographic cross-sectional view that contributes to judgment of inundation risk. The flood damage analysis apparatus 2 stores storage means for storing a position of a breach point that breaks into a river and a property position that is designated as a target for inundation due to a flooded breach. The cross-section display section 22 along the flood flow that causes the display device to display a cross-sectional view along the base line of the path of the flood flow that flows out from the breakwater point to the property position, and the property A line segment including a periphery of the property position passing through the position is used as a base line of the cross-sectional view, and a cross-section display unit 23 around the property for displaying the cross-sectional view along the base line on the display device. [Selection] Figure 1

Description

The present invention, water damage analyzer, and, about the flood analysis how.

In recent years, flood damage due to torrential rains and typhoons has frequently occurred, and effective measures to reduce the damage have been demanded. In order to reduce the damage, it is necessary to grasp the damage caused by flooding in each region in advance. Against this background, an “inundation simulation device” has been proposed.
Patent Document 1 describes an inundation simulation device that displays a cross-sectional view of a water level on a display along a straight line (baseline) designated from the map by a user operating a mouse pointer. Thereby, it can be grasped to what level the water surface is flooded with respect to the ground surface.
When a point where the embankment breaks is input to this inundation simulation device, a map with the inundation depth distribution is output. An example of the map is disclosed in FIG.

JP 2008-84243 A JP 2006-106124 A

  Inventors created the cross-sectional view production | generation means as software with the method of patent document 1. FIG. However, when I tried to apply it to actual work, I found that these means are not suitable for this work. There were two reasons for this.

  The first reason is that it is difficult to produce a topographic cross-sectional view that contributes to the judgment of inundation risk with uniform quality. In the method of generating a cross-sectional view passing through two points designated on the map by the user disclosed in the prior art, the result varies greatly depending on how the user designates. It was found that there is a need for a systematic method of generating topographical maps that contribute to the judgment of inundation risk.

  The second reason is that there are tens of thousands of properties to be evaluated. With the advancement of supply chain management, there are a lot of properties related to a company, and depending on the company, the number of properties to be evaluated can reach tens of thousands. The means created on the screen by the user disclosed in the prior art requires enormous effort for the evaluation. It was found that there is a need for a method that automatically generates topographic maps that help determine the risk of inundation.

  Therefore, the problem to be solved by the present invention is to systematically and automatically generate a topographic cross-sectional view that contributes to the determination of inundation risk.

In order to solve the above problems, the water damage analysis apparatus of the present invention is:
The position of the breach points breach against river, a storage unit and property location designated as decision object of inundation flood flow that breach is stored,
A cross-sectional display section along the flood flow that displays the cross-sectional view along the baseline as a base line of the cross-sectional view that flows out from the breach point and reaches the property position ,
A cross-sectional display section around the property that passes through the property position and includes a line segment including the periphery of the property position as a base line of the cross-sectional view, and displays the cross-sectional view along the base line on the display device;
It is determined whether there is a path of the inundation flow that flows out from the breach point and reaches the property position, and when there is a path of the inundation flow, a cross section by a cross-section display unit along the inundation flow A cross-sectional view along the base line of the figure is displayed on the display device, and when the path of the flood flow does not exist, a cross-sectional view along the base line of the cross-sectional view by the cross-sectional display portion around the property is displayed on the display device The other means characterized by having an inundation determination section to be described later will be described.

  According to the present invention, it is possible to systematically and automatically generate a topographic cross-sectional view that contributes to the determination of inundation risk. That is, a cross-sectional view useful for determining whether or not the target property is flooded can be created with uniform quality.

Fig.1 (a) is a block diagram which shows a flood damage analysis system. FIG.1 (b) is a block diagram which shows each process part and each data of a flood damage analysis system. It is a sequence diagram which shows the input / output process of the flood analysis apparatus regarding one Embodiment of this invention. Fig.3 (a) is a block diagram which shows property data. FIG. 3B is a configuration diagram showing flood damage analysis data. It is a screen figure which shows the window for water damage analysis regarding one Embodiment of this invention. It is a flowchart which shows the water damage analysis process regarding one Embodiment of this invention. FIG. 5 is a screen diagram in which the water damage status of each mesh indicated by water damage analysis data is displayed in a three-dimensional manner on the three-dimensional map of FIG. 4 relating to an embodiment of the present invention. Fig.7 (a) is a screen figure of a three-dimensional map which shows the case where the cross-section display part along a flood flow employs a trajectory line as a base line. FIG. 7B is a screen diagram illustrating a case where the cross-section display unit along the flood flow adopts a line segment (approximate line of the trajectory line) as a base line. FIG. 8 is a screen view showing a cross-sectional view along the base line of FIG. Fig.9 (a) is a screen figure which shows sectional drawing display in case the property elevation is lower than the breakwater point elevation. FIG.9 (b) is a screen figure which shows sectional drawing display when a hill exists in the middle from the bank breakage point to a property. FIG. 10A is a screen diagram of a three-dimensional map showing a case where a cross-section display section around a property adopts a line segment passing through the target property as a base line. FIG.10 (b) is a screen figure which shows the cross-sectional view display along the base line of Fig.10 (a). It is a screen figure which shows the case where the result information (inundation depth time series data) of flood damage analysis data is added to the sectional view of FIG.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

Fig.1 (a) is a block diagram which shows a flood damage analysis system. The water damage analysis system includes a water damage analysis device 2 connected to an input / output unit 1 and an HDD (Hard Disk Drive) 3.
The flood damage analysis apparatus 2 is a PC (Personal Computer) including a CPU (Central Processing Unit) 28 and a memory 29, and is connected to the HDD 3 so as to be accessible.
The HDD 3 may be built in the water damage analysis device 2 or connected to the outside of the water damage analysis device 2 or connected to another device accessible from the water damage analysis device 2 via a network (not shown). May be.

The memory 29 is configured by a RAM (Random Access Memory) or the like. Arithmetic processing is realized by an arithmetic processing unit configured by the CPU 28 executing a program on the memory 29, and data is input to and from other interfaces (input / output unit 1, HDD 3) as appropriate during the execution. Output.
Here, the input / output unit 1 is a mechanism for inputting / outputting data to / from the flood analysis apparatus 2, and includes input means such as a keyboard 12 and a mouse 13 and output means such as a display 11. The user can input a command from the input unit and check the result from the output unit.

FIG.1 (b) is a block diagram which shows each process part and each data of a flood damage analysis system.
Hereinafter, as an example of flood damage handled by the flood analysis apparatus 2, an example is shown in which a bank break occurs in a river and a flood flow flows from the bank break point. On the other hand, the target of flood damage handled by the flood analysis apparatus 2 is not limited to flood damage in rivers, but can also be applied to water areas such as dams, ponds, and lakes.
The memory 29 is loaded with a program for realizing each processing unit (the inundation determination unit 21, the cross-section display unit 22 along the flooded flow, and the cross-section display unit 23 around the property) constituting the flood damage processing unit 20. .
Various data (water damage analysis data 31, property data 32, map data 33, and altitude data 34) to be processed by each processing unit are recorded in the HDD 3.

The flood damage analysis data 31 is analysis data relating to flood damage flooded from a predetermined portion of the river (hereinafter referred to as a breach point). The flood damage analysis data 31 uses, for example, flood damage simulation result data. The details of the flood (flooding) simulation are described in, for example, Patent Document 1 and documents “Kurijo Satoshi, Tadashi Suetsuji, Hitoshi Unno, Yoshito Tanaka, Hiroaki Kobayashi: Flood Simulation Manual (draft), Civil Engineering Research Institute Material 3400, 1996. "It is described in. Japanese Patent Application Laid-Open No. 2004-197554 and Japanese Patent Application Laid-Open No. 2005-128838 describe an inundation simulation apparatus that outputs a map in which a flooding depth distribution for an input position is written.
Note that the flood damage simulation result data may be created independently by the user, or may be referred to data created by the government agency. Since the administrative agency conducts flood damage simulations to create the “Inundation Area Plan” defined by the Flood Control Law, the flood damage simulation result data is stored in the administrative agencies.

The property data 32 is data of a place (hereinafter referred to as a property) that is a target for determining whether or not to be flooded due to flood damage, and is, for example, location information of the user's home.
The map data 33 includes information necessary for allowing the user to understand the terrain (location). The data included in the map data 33 includes, for example, the position of roads, rivers, summits, contour lines, place names, ground surface image data taken from satellites, and latitude and longitude in addition to the position of rivers that may be flooded. The line to show is mentioned.

  The elevation data 34 is data generally called DEM (Digital elevation model). That is, the altitude data 34 is information describing a grid sectioned on the ground surface and the altitude of the ground surface in the grid. For example, the elevation data 34 includes elevation values in a square grid arranged at equal intervals on the ground surface or a grid represented by a triangular irregular network.

The inundation determination unit 21 determines whether or not the target property (such as the user's home) specified by the property data 32 is inundated by the flood damage indicated by the flood analysis data 31.
Note that the inundation determination unit 21 may use inundation determination input from a user who views a cross-sectional view described later with reference to FIGS.

When the inundation determination unit 21 determines that the property is inundated, the cross-section display unit 22 along the inflow displays a cross-sectional view of the path of the inundation flow (details are FIGS. 8 and 9). Note that the flood flow route to be displayed is, for example, the starting point is the bank breakage point and the end point is the property position, but the upstream side may be displayed or the downstream side from the property position. It may be displayed.
When the inundation determination unit 21 determines that the property is not inundated, the cross section display unit 23 around the property displays a cross-sectional view including the periphery of the property position (details are shown in FIG. 10).
Note that map data 33 and altitude data 34 are read as material data for displaying a sectional view.

FIG. 2 is a sequence diagram showing input / output processing of the water damage analysis apparatus.
In S <b> 11, the flood damage processing unit 20 activated from the flood damage analysis apparatus 2 transmits a read request (S <b> 21) of various data (water damage analysis data 31, property data 32, map data 33, altitude data 34) to the HDD 3. In S12, the HDD 3 reads the requested various data and returns the result to the flood analysis device 2 (S22).

In S13, the display 11 receives the screen display signal (S23) as shown in FIG. This screen display is, for example, a window GUI (Graphical User Interface), and the displayed items can be edited.
In S14, the water damage analysis apparatus 2 receives an instruction (S24) transmitted from the keyboard 12 and the mouse 13. And the flood analysis apparatus 2 transmits the result (FIGS. 8-10) of the cross-sectional view produced | generated by the cross-section display part 22 or the cross-section display part 23 around a property along a flood flow to the display 11 (S25). In S15, the display 11 displays the cross-sectional view transmitted in S25.

  FIG. 3A is a configuration diagram showing the property data 32. The property data 32 is data that associates a name, a position (latitude, longitude, altitude), and a set of cross-sectional views (first cross-sectional view, second cross-sectional view,...) For each property. The sectional view set is a bundle of sectional views created for the same property, and one sectional view is used as one image file (for example, “A / 1a.png”). The data format of the cross-sectional view is not limited to a bitmap image file, and may be a vector format, or material data for generating a cross-sectional view including a numeric string separated as CSV (Comma-Separated Values). Good.

FIG. 3B is a configuration diagram showing the flood damage analysis data 31.
The flood damage analysis data 31 includes condition information 310 (information relating to flood damage analysis conditions) and result information 320 (information relating to flood damage analysis results).
The condition information 310 includes the target river 312 to be subjected to the flood analysis, the breach point information 311 from the target river 312, the target rainfall 313 for the flood analysis, the mesh size 314 used in the flood analysis, and the flood analysis. It consists of the creator 315 of the data 31. The creator 315 is, for example, the name of an administrative organization that manages the target river 312. The breach point information 311 includes position information (center latitude, longitude) for each breach point, its break width, and a time series value of the flow rate.
The result information 320 of the flood damage analysis data 31 includes, for each mesh designated by the mesh size 314, the maximum inundation depth distribution storing the value at the moment when the inundation depth becomes the deepest, the time series value of the inundation depth, the flow velocity The time series value is included.

  FIG. 4 is a screen view showing a flood damage analysis window. This window is displayed by a screen display signal (S23). The flood damage analysis window includes a three-dimensional map 410, a property list 420, a property property 430, and a cross-sectional view display button 440.

  In the three-dimensional map 410, a property A411, a property B412, a river (XX river) 413, and a mountain 414, which are objects of inundation determination, are displayed. Property A411 and property B412 are each read from property data 32 and displayed. The river 413 and the mountain 414 are read from the map data 33 and the altitude data 34, and are displayed together with the altitude lines indicated by broken lines.

  Note that the scale of the map data 33 displayed on the three-dimensional map 410 is preferably the same as the spatial scale of the flood phenomenon. Therefore, if it is a typical flood phenomenon, a large scale (detailed map) of 1/25000 or more is appropriate. Further, the position, scale, and orientation of the map data 33 displayed on the three-dimensional map 410 can be changed by operations from the user. In FIG. 4, the position, scale, and orientation are adjusted so that the target river 312 of the flood damage analysis data 31 is displayed on the screen. The target river 312 of the flood damage analysis data 31 is displayed as a river 413 in FIG.

  In the property list 420, properties displayed on the three-dimensional map 410 are read from the property data 32 and listed. Then, a selection (clicking) operation of a specific property is accepted from the user with the mouse pointer 451. In FIG. 4, the property A (the property A411) is selected. Note that after the property is selected, the position, scale, and orientation of the map data 33 displayed on the three-dimensional map 410 may be changed so that the property is displayed.

In the property property 430, information on the target property selected from the property list 420 or the target property selected by directly clicking the property A411 on the three-dimensional map 410 is read from the property data 32 and displayed. The section view item is a pull-down menu 431, and one section view can be selected for the current display from the set of section views of the property data 32 described with reference to FIG.
The section view display button 440 is a button for displaying the section view selected from the pull-down menu 431 as a separate window. When the cross-section display button 440 is clicked with the mouse pointer 452, the water damage processing unit 20 is instructed to create a cross-section regarding the selected target property (S24).

  FIG. 5 is a flowchart showing the water damage analysis process. This flowchart is a process executed by the flood damage processing unit 20 until receiving an instruction of a sectional view in S14 of FIG. 2 (S24) and returning a result display (S25).

  In S <b> 111, the inundation determination unit 21 determines whether or not the target property specified from the property list 420 is inundated. In S112, the inundation determination unit 21 proceeds to S114 when it is determined to be submerged (Yes) in S111, and proceeds to S113 when it is determined not to be submerged (No).

When there is both the possibility of flooding of the property and the possibility of non-flooding in S111, both cross-sectional views are generated by executing the processing after S113 and the processing after S114. May be.
Further, the determination process of the inundation determination unit 21 (S111, S112) may be omitted, and only one of the processes after S113 and the processes after S114 may be executed. Further, when the water is not flooded (S111, No), the creation and display of the cross-sectional view may be omitted, and instead of displaying the cross-sectional view, a message such as “the risk of flooding of the target property is low” is displayed. Just be fine.

  In S113, the cross-section display unit 23 around the property sets the cross-sectional view of the target property to be displayed, and the line segment passing through the target property is used as a base line of the cross-sectional view, and the periphery of the target property is displayed as a cross-sectional view. Range. The section display unit 23 around the property sets the direction of the base line that is a straight line as a predetermined direction (for example, a direction along the east-west, a direction along the north-south, a direction along the north-east / south-west, and a north-west / south-east). 4 directions in total) (see FIG. 10A for details).

  In S <b> 114, the cross-section display unit 22 along the flood flow branches according to the designated baseline generation method. When the base line is a trace line (S114, trace line), the process proceeds to S115, and when the base line is an approximate line of the trace line (S114, approximate line), the process proceeds to S116. In addition, a trajectory line is a line which shows the locus | trajectory that the virtual particle | grains in a fluid move with progress of time.

In S115, the cross-section display unit 22 along the flood flow uses the information (trajectory line) indicating the path of the flood flow as the baseline path of the cross-sectional view, and the end point (from the starting point (breakpoint) of the flood flow) The display range of the sectional view is up to the property position (see FIG. 7A for details).
In S116, the cross-section display unit 22 along the flood flow, for example, straightens the start point and the end point as an approximate line of the trajectory line from the start point (breach point) to the end point (property position) of the path of the flood flow. The connecting line segment is used as the base line path of the cross-sectional view, and the display range of the cross-sectional view is from the starting point to the end point of the approximate line (refer to FIG. 7B for details).

  In S117, the cross-section display unit 22 along the flood flow creates a cross-section according to the cross-section setting (base line and display range) calculated in S115 or S116, and displays the creation result on the screen. Alternatively, the section display unit 23 around the property creates a sectional view according to the setting of the sectional view calculated in S113, and displays the creation result on the screen.

FIG. 6 is a screen view in which the three-dimensional map 410 shown in FIG. The flood damage 416 caused by the breakwater point 415 causes the property A to be submerged, but the property B does not.
In FIG. 6, one bank breakage point 415 is displayed in the three-dimensional map 410, but a plurality of bank breakage points may exist. For example, it is common to assume a number of breach points in a flood simulation conducted by an administrative agency to create an “expected inundation area map”. Specifically, the simulation is performed by the following method. First, a number of breakwater points are assumed (Step 1). Next, one of the breakwater points is selected and simulation is performed to create water damage analysis data 31 (Step 2). The processing in Step 2 is performed for each bank breakpoint in Step 1 (step 3). Therefore, in this case, there are a plurality of breakwater points, and the flood damage analysis data 31 exists for each breakwater point.

Then, when there are a plurality of bank breakage points where the target property is flooded, the flood damage processing unit 20 may select a bank breakage point to be displayed as described below.
(Selection 1) Select all the breakwater points that flood the target property (without narrowing down), and display a separate cross-sectional view for each selected breakwater point.
(Selection 2) A cross-sectional view is displayed for the breakwater point (or the short upper multiple breakwater points) where the time from the breakwater to the inundation of the property is the shortest.
(Selection 3) A cross-sectional view is displayed for the bank breakage point (or deeper upper bank breakage points) where the property has the deepest inundation depth.

FIG. 7A is a screen diagram of the three-dimensional map 410 showing a case where the cross-section display unit 22 along the flood flow adopts a trajectory line from the bank breakage point 415 to the property position 411 as the base line 418a in S115. is there.
The cross-section display unit 22 along the flood flow calculates the following formula from the flood analysis data 31 of FIG. 3B shown in the flood damage 416 of FIG. A trajectory line (base line 418a) of the route is obtained.

  Then, the cross-section display unit 22 along the flood flow is flooded by tracing back from the downstream (target property A) to the upstream (breaking point) of the trajectory line that passes (submerged) the target property A. A base line 418a that is a flow path is specified.

FIG. 7B is a screen showing a case where the cross-section display unit 22 along the flood flow adopts a line segment (approximate line of the trajectory line) from the breach point 415 to the property position 411 as the base line 418b in S116. FIG.
In FIG. 7, the end points of the base lines 418a and 418b are each up to the property position 411. However, the base lines 418a and 418b may be extended upstream or downstream and included in the base line.

  FIG. 8 is a screen view showing a cross-sectional display (S117) along the base line of FIG. The horizontal axis indicates each position of the flood flow path along the base line from the breakwater point 415 to the position 411 of the property A, and the vertical axis indicates the altitude (the height of the ground surface) at each position. By referring to this cross-sectional view, the user knows that there is a high risk of inundation at the property position because the property position is lower than the breakwater point and there is no terrain that blocks the flow such as a hill in the middle. it can.

FIG. 9A is a screen diagram showing a cross-sectional view of the target property X1 different from FIG. 8 when the property elevation is lower than the breakwater elevation. The user can grasp that the risk of inundation to the property position is high by grasping that the upstream bank breakpoint exists at a high position.
FIG.9 (b) is a screen figure which shows sectional drawing display in case a high ground exists in the middle from the bank breakage point about the object property X3 different from FIG. Although the user exists at a position where the upstream bank breakage point is high, there is a possibility that a hill in the middle blocks the flooding that causes water damage. Of course, there is a possibility that the flow can reach the property through a route other than the cross-sectional view, so although it cannot be determined by this diagram alone, it can be seen that the shape of the hill has a significant impact on the risk of flooding the property location. .

FIG. 10A is a screen diagram of the three-dimensional map 410 showing a case where the section display unit 23 around the property adopts the line segment passing through the target property B 412 as the base lines 419a and 419b in S113. Since it is determined that the water is not flooded in the pretreatment of S113 (S111, No), the target property B412 may be focused without considering the breakwater point 415. Therefore, what is necessary is just to create sectional drawing for making a user grasp | ascertain that there is no flow which infiltrates target property B412.
Therefore, the cross section display unit 23 around the property sets the line segments 419a and 419b passing through the target property B 412 as the base line of the cross sectional view as described in S113. A first cross-sectional view is created from the line segment 419a, a second cross-sectional view is created from the line segment 419b, and the set of cross-sectional views is stored in association with the property data 32.

FIG.10 (b) is a screen figure which shows sectional drawing display (S117) along the base line 419a of Fig.10 (a). Compared to the cross-sectional view of FIG. 8, the cross-sectional view of FIG. 10B does not include the breakwater point, so by placing the target property B in the center of the horizontal axis, the elevation around the target property B is Make it easy to check. Thereby, the user can grasp | ascertain that the risk of the inundation to a property position is low by grasping | ascertaining that the target property B exists on a hill (the foot of XX mountain).
Furthermore, the cross-sectional view of FIG. 11 is a screen view in which result information 320 (water immersion time series data) of the flood damage analysis data 31 is added to the cross-sectional view of FIG. By displaying the screen view of FIG. 11 in a cross-sectional view (S117), it is indicated that the target property B is higher than the area inundated, so that it is intuitively easy to understand.

As described above, the flood damage analysis apparatus 2 according to the present embodiment displays information on the display 11 for determining the risk of inundation due to the inundation flow from the bank breakage point to the target property caused by the flood damage.
Therefore, the flood damage processing unit 20 generates a cross-sectional view along the flood flow path from the breakwater point to the target property when inundated, and generates a cross-sectional view around the target property when not inundated.

That is, the problem to be solved by the flood damage analysis apparatus 2 of the present embodiment is to systematically and automatically generate a topographic cross-sectional view that contributes to the determination of inundation risk.
This problem is a problem that cannot be solved by conventional techniques such as Patent Document 1. For example, if the user simply creates a cross-sectional view that passes through two points designated on the map, the result varies depending on the user's designation method, and it is difficult to create a uniform quality.
In addition, with the advancement of supply chain management, there are many properties related to a certain company, and there are tens of thousands of target properties depending on the company. Therefore, the means that the user creates on the screen requires enormous effort for the evaluation.

  Therefore, the flood damage analysis apparatus 2 of the present embodiment uses the bank breakage point information 311 input as the flood damage analysis data 31 or the property data 32 that exists separately in the real estate management system, etc., so that the user can see the map on the map. It is possible to reduce the trouble of directly creating the base line position of the sectional view.

In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.
Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment.
Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment. Each of the above-described configurations, functions, processing units, processing means, and the like may be realized by hardware by designing a part or all of them with, for example, an integrated circuit.
Each of the above-described configurations, functions, and the like may be realized by software by interpreting and executing a program that realizes each function by the processor.

Information such as programs, tables, and files for realizing each function is stored in a memory, a hard disk, a recording device such as an SSD (Solid State Drive), an IC (Integrated Circuit) card, an SD card (registered trademark), a DVD (Digital). It can be placed on a recording medium such as Versatile Disc.
Further, the control lines and information lines indicate what is considered necessary for the explanation, and not all the control lines and information lines on the product are necessarily shown. Actually, it may be considered that almost all the components are connected to each other.

1 Input / output unit 2 Water damage analysis device 3 HDD
11 Display 12 Keyboard 13 Mouse 28 CPU
29 Memory 20 Flood damage processing section 21 Inundation judgment section 22 Cross section display section along inundation flow 23 Cross section display section around property 31 Flood analysis data 32 Property data 33 Map data 34 Elevation data

Claims (3)

Storage means for storing the location of the breaching point that breaks against the river and the location of the property designated as the target of inundation due to the flooded breached flow;
A cross-sectional display section along the flood flow that displays the cross-sectional view along the baseline as a base line of the cross-sectional view that flows out from the breach point and reaches the property position,
A cross-sectional display section around the property that passes through the property position and includes a line segment including the periphery of the property position as a base line of the cross-sectional view, and displays the cross-sectional view along the base line on the display device;
It is determined whether there is a path of the inundation flow that flows out from the breach point and reaches the property position, and when there is a path of the inundation flow, a cross section by a cross-section display unit along the inundation flow A cross-sectional view along the base line of the figure is displayed on the display device, and when the path of the flood flow does not exist, a cross-sectional view along the base line of the cross-sectional view by the cross-sectional display portion around the property is displayed on the display device A flood damage analysis apparatus comprising: an inundation determination unit. The flood damage analysis apparatus according to claim 1, wherein the cross-section display unit along the flood flow uses a line segment passing through the bank breakage point and the property position as a path of the flood flow. The flood analysis apparatus has storage means, a cross-section display section along the inundation flow, a cross-section display section around the property, and an inundation determination section.
The storage means stores the location of the breach point that breaks into the river and the property position that is designated as a target for inundation due to the flooded breach.
The cross-section display unit along the flood flow is a cross-flow baseline that flows out from the breach point and reaches the property position, and displays a cross-sectional view along the base line on the display device.
The section display section around the property passes through the property position, a line segment including the periphery of the property position is set as a base line of the cross-sectional view, and a cross-sectional view along the base line is displayed on the display device,
The inundation determination unit determines whether there is a path of the inundation flow that flows out from the breach point and reaches the property position, and when the path of the inundation flow exists, along the inundation flow The cross-sectional view along the base line of the cross-sectional view by the cross-sectional display unit is displayed on the display device, and the cross-sectional view along the base line of the cross-sectional view by the cross-sectional display unit by the cross-sectional display unit around the property when the flood flow path does not exist Is displayed on the display device.

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