Flood economic loss map drawing method, system, equipment and medium

Abstract

The invention provides a flood economic loss map drawing method, system and device and a medium, and belongs to the field of disaster loss assessment, and the method comprises the steps: building a flood routing model of a research region; flood influence analysis is carried out according to the flood routing model, and the maximum submerged water depth and the area corresponding to the maximum submerged water depth area are obtained; acquiring social economic property data of each industry in the research area, calculating economic density of each industry in the research area according to the social economic property data of each industry, and calculating economic property loss values of each industry according to the area, the economic density and the flood property loss rate corresponding to the maximum submerged water depth area; and drawing the economic property loss value of each industry into a map layer in ArcGIS, and superposing the map layer to a corresponding map layer to obtain a flood economic loss map. The subjectivity of evaluating specific economic losses is reduced, a more scientific and reasonable flood control decision can be made, and resource allocation is optimized.

Description

Technical Field

[0001] The present invention belongs to the field of disaster loss assessment, and in particular relates to a method, system, equipment and medium for drawing a flood economic loss map. Background Art

[0002] Floods pose a huge threat to human life and property safety, and it is very necessary to scientifically and rationally assess the economic losses caused by floods. Flood economic loss maps are an analytical tool that presents the economic losses caused by floods in the form of graphs. It helps to improve people's understanding of flood disasters, provide a basis for the formulation of flood prevention and disaster reduction policies, optimize the allocation of disaster relief resources, enhance disaster risk management capabilities, promote cross-regional cooperation and exchanges, and improve scientific research and prediction capabilities. Therefore, a practical and effective method for drawing flood economic loss maps is conducive to making more scientific and reasonable flood prevention decisions and optimizing resource allocation.

[0003] Existing flood risk maps usually qualitatively divide flood risks into several different levels or intervals, such as low risk, medium risk and high risk, based on factors such as flood water depth, flow rate and arrival time. However, this method has the disadvantage of being highly subjective. Although this classification method can help decision makers and the public understand the approximate distribution of flood risks, there is no unified standard for dividing flood risk areas. The assessment results between different regions are difficult to compare and reference, and are not intuitive enough in assessing specific economic losses. Summary of the invention

[0004] In order to solve the problems of strong subjectivity and inconsistent standards in the existing drawing of flood disaster economic loss maps, the present invention provides a flood economic loss map drawing method, system, device and medium.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A method for drawing a flood economic loss map comprises the following steps:

[0007] Establish a flood evolution model for the study area; conduct flood impact analysis based on the layer information of the flood evolution model to obtain the maximum flooding depth in the study area and the area corresponding to the maximum flooding depth area;

[0008] Obtain the socio-economic property data of each industry in the study area, and calculate the economic density of each industry in the study area based on the socio-economic property data of each industry; obtain the flood property loss rate based on the industry type in the study area and the maximum flooding depth of each industry type; calculate the economic property loss value of each industry based on the area, economic density and flood property loss rate corresponding to the maximum flooding depth area;

[0009] The economic property loss values ​​of each industry are plotted as a flood economic loss map.

[0010] Preferably, the social and economic property data of each industry in the study area is obtained by obtaining the land use type and various types of social and economic property data in the study area, dividing the various types of social and economic property data into different industries according to the land use type, and summing the various types of social and economic property data by industry within a set time period to obtain the social and economic property data of each industry.

[0011] Preferably, the economic density of each industry in the study area is calculated based on the socio-economic property data of each industry, specifically by the following formula:

[0012] W im =W i / A im ;

[0013] Among them, W im W is the property value per unit area of ​​the i-th property in the m-th land use type space in the study area; i is the total value of property type i in the study area; A im is the total area of ​​land of type m corresponding to the total value of property of type i in the study area.

[0014] Preferably, the economic property loss value of each industry is calculated according to the area, economic density and flood property loss rate corresponding to the maximum flooded water depth area, and is specifically calculated by the following formula:

[0015] S i =∑W ni A n L nij ;

[0016] Among them, S i is the total loss value of the i-th type of property in the flooded area, W ni A is the unit area property value of the i-type property in the n-th unit grid within the flooded area, n is the area of ​​the nth grid, L nij is the property loss rate of type i property distributed in the nth unit grid under the maximum flooding depth level j.

[0017] Preferably, the economic property loss values ​​of each industry are plotted as a flood economic loss map, specifically, the economic loss data calculation results of each industry in the flooded range are made into a layer in ArcGIS, different colors are used to represent different economic loss levels, and it is superimposed on the corresponding map.

[0018] Preferably, the flood evolution model of the study area is specifically to interpolate the DEM data of the study area into the terrain file; use the design flood process line as the upstream flow data for modeling, set the parameters of the model, and construct the flood evolution model of the study area through MIKE21.

[0019] Preferably, the various industries specifically include agriculture, fishery, animal husbandry, industry, towns and rural areas.

[0020] The present invention also provides a flood economic loss map drawing system, which specifically includes:

[0021] The flood impact analysis module is used to establish a flood evolution model for the study area; based on the layer information of the flood evolution model, a flood impact analysis is performed to obtain the maximum flooding depth in the study area and the area corresponding to the maximum flooding depth area.

[0022] A data module is used to obtain the socio-economic property data of each industry in the study area, calculate the economic density of each industry in the study area based on the socio-economic property data of each industry; obtain the flood property loss rate based on the industry type in the study area and the maximum inundation depth of each industry type; and calculate the economic property loss value of each industry based on the area, economic density and flood property loss rate corresponding to the maximum inundation depth area.

[0023] The loss map drawing module is used to draw the economic property loss values ​​of each industry into a flood economic loss map.

[0024] The present invention also provides a computer device, comprising a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps described in the method for drawing a flood economic loss map.

[0025] The present invention also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is loaded by a processor, the steps described in the method for drawing a flood economic loss map can be executed.

[0026] The method for drawing a flood economic loss map provided by the present invention has the following beneficial effects:

[0027] The present invention establishes a flood evolution model for the study area, conducts flood impact analysis, and obtains the maximum flooded water depth and area. The economic density of each industry and the economic losses caused by floods are obtained based on the socio-economic property data of each industry. Combined with the maximum flooded water depth area, economic density and flood property loss rate, the impact of flood disasters is quantitatively evaluated to reduce subjective influences. The evaluation results are intuitively presented on a map to obtain a flood economic loss map, which helps decision makers and the public to more intuitively understand the impact and distribution of flood disasters, and realizes the multi-dimensional, refined and visualized flood disaster assessment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiment of the present invention and its design scheme, the following briefly introduces the drawings required for this embodiment. The drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 The present invention is a flowchart of a method for drawing a flood economic loss map according to an embodiment of the present invention.

[0030] Figure 2 It is a terrain interpolation map of a river mainstream in an embodiment of the present invention.

[0031] Figure 3 This is a diagram of the maximum flooding depth of a river in an embodiment of the present invention when encountering a flood with a return period of 20 years.

[0032] Figure 4 This is a diagram of economic losses per unit area during a flood with a return period of 20 years in a certain river section in an embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present invention and implement it, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the scope of protection of the present invention.

[0034] Example

[0035] The present invention provides a method for drawing a flood economic loss map. Figure 1 As shown in the figure, taking a river basin encountering a flood that occurs once every 20 years as an example, the specific steps include:

[0036] Step 1: Simulate the evolution of dam breach flood.

[0037] A two-dimensional flood evolution model of the study area was constructed based on MIKE21. The riverbank of a river basin and the boundary line of the study area were extracted from Bigemap software, and the 30m resolution topographic map in the geospatial data cloud was used as the DEM data of the study area.

[0038] 1) Use the Mesh Generator module to create irregular triangle terrain files for river bank lines and study area boundaries, and make the DEM data of the study area into xyz files and evenly interpolate them into the terrain files. The terrain interpolation diagram of a river mainstream is shown below: Figure 2 shown.

[0039] 2) Calculate the design flood process line and use it as the upstream flow data of the MIKE21 FM HD model. Calculate the flow-water level relationship at the river outlet section and use it as the outlet section flow output condition.

[0040] 3) Set the relevant parameters of the MIKE21 FM HD model, such as roughness, time step, initial conditions, dry and wet moving boundaries, etc.

[0041] 4) Construct the MIKE21 FM HD model through the Flow Model FM module, perform simulation calculations and conduct rational analysis.

[0042] 5) Extract water level, maximum water depth and other data through ArcGIS and other software, and analyze the results.

[0043] Based on the measured water level and flow data of hydrological stations A and B, the reliability of the simulation results of the hydrodynamic model is verified by comparing them with the numerical simulation results. Five points of Zhongmu Hydrological Station and Xinzheng Hydrological Station were selected, and the simulated water depth was compared with the actual water depth under the same flow rate. The results are shown in Table 1. Table 1 shows that the average error between the simulated water depth and the actual water depth of Zhongmu Hydrological Station is 7.73%, and the average error between the simulated water depth and the actual water depth of Xinzheng Hydrological Station is 6.13%. Both errors are small, indicating that the simulation results of the MIKE hydrodynamic model are accurate and can provide data support for subsequent calculations.

[0044] Table 1 Comparison of actual water depth and simulated water depth at hydrological station A and hydrological station B

[0045]

[0046] Step 2: Flood impact analysis.

[0047] The flood evolution simulation results were imported into ArcGIS and superimposed with the land use map of the study area. A river basin has a variety of land use types, including dry land, paddy fields, canals, urban land, rural settlements, and other construction land. The land use types are divided into agriculture, fishery, animal husbandry, industry, and urban and rural land according to the industry. Taking a river encountering a 20-year flood as an example, the maximum flooded water depth and area of ​​each industry are extracted, as shown in Table 2.

[0048] Table 2 Statistics of the maximum water depth area in a river basin once in 20 years (km 2 )

[0049]

[0050]

[0051] Step 3: Collection and spatial distribution of socio-economic data.

[0052] According to the statistical yearbook of a certain study area and related references, the types of economic indicators, land use types and various types of socio-economic property data were statistically analyzed. The various types of socio-economic property data were divided into different industries according to the land use types, and the socio-economic database required for flood disaster loss assessment was established. The various types of socio-economic property data were summed up by industry on an annual basis. The property density of each industry in the study area was calculated using the following formula. The corresponding relationship between the submerged land type and the property density of each industry is shown in Table 3.

[0053] W im =W i / A im ;

[0054] Among them, W im is the property value per unit area of ​​the i-th property in the m-th land use type space in the study area, that is, the economic density; W i is the total value of property type i in the study area; A im is the total area of ​​land of type m corresponding to the total value of property of type i in the study area.

[0055] Table 3 Types of submerged land and property density of corresponding industries in the study area

[0056] Flooded land use type Corresponding industries <![CDATA[Property density (100 million / km 2 )]]> Irrigated land, paddy field, dry land agriculture 0.06 Water Fisheries 0.035 Urban land (urban settlements) town 20.44 Rural Settlements I Rural 2.29 Rural Settlements Ⅱ Animal Husbandry 0.19 Urban construction land industry 21.76

[0057] After determining the industries and water depths in the inundated area, the flood loss rates in areas with similar socioeconomic development to the inundated area are compared with each other to obtain the loss rates of each industry at different water depths, as shown in Table 4.

[0058] Table 4 Flood loss rate of various industries

[0059]

[0060] Step 4: Calculation of economic losses.

[0061] According to the evolution results of floods of various frequencies in a river (including basic elements such as inundation range and maximum water depth), the inundation conditions of different administrative regions within the inundation range, land types, affected GDP and other indicators are considered, and the maximum inundation depth area, economic density of various industries and flood property loss rate are combined to evaluate the direct economic losses caused by floods to various industries in the inundation area. The specific formula is as follows:

[0062] S i =∑W ni A n L nij ;

[0063] Among them, S i is the total loss value of the i-th type of property in the flooded area, W niA is the property value per unit area of ​​the i-th type of property in the n-th unit grid within the flooded area, that is, the property density, n is the area of ​​the nth grid, L nij is the property loss rate of type i property distributed in the nth unit grid under the maximum flooding depth level j. Total economic property loss S z The specific calculation formula is:

[0064] S z =∑S i ;

[0065] Step 5: Draw a flood economic loss map.

[0066] In order to more intuitively display the spatial distribution of flood risk in the dam-break flood inundation area, according to the economic losses of various industries calculated in step 4, the economic loss data of various industries in the inundation range are made into a layer in ArcGIS, with different colors representing different economic loss values, and superimposed on the corresponding map. Other map elements such as administrative divisions, rivers, roads, etc. can be added as needed to better understand and analyze the distribution of flood economic losses. Taking a river basin that encounters a 20-year flood as an example, the flood economic loss map is as follows: Figure 4 shown.

[0067] The present invention also provides a flood economic loss map drawing system, which specifically includes:

[0068] The flood impact analysis module is used to establish a flood evolution model for the study area; based on the layer information of the flood evolution model, flood impact analysis is performed to obtain the maximum flooding depth in the study area and the area corresponding to the maximum flooding depth area.

[0069] The data module is used to obtain the socio-economic property data of each industry in the study area, calculate the economic density of each industry in the study area based on the socio-economic property data of each industry; obtain the flood property loss rate based on the industry type in the study area and the maximum inundation depth of each industry type; and calculate the economic property loss value of each industry based on the area, economic density and flood property loss rate corresponding to the maximum inundation depth area.

[0070] The loss map drawing module is used to draw the economic property loss values ​​of various industries into a flood economic loss map.

[0071] Each module in the above-mentioned flood economic loss map drawing system can be implemented in whole or in part by software, hardware and their combination. Each module can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the corresponding operations of each module.

[0072] The present invention also provides a computer device, including a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps in an embodiment of a method for drawing a flood economic loss map. The specific implementation method can be found in the method embodiment, which will not be described in detail here.

[0073] Furthermore, the present invention also provides a non-temporary computer-readable storage medium containing instructions, and a computer program is stored on the storage medium. For example, a memory containing instructions, the above instructions can be executed by a processor of a computer device to complete the above method. For example, a non-temporary computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device. When the computer program is executed by the processor, it can implement the steps in an embodiment of a method for drawing a flood economic loss map. The specific implementation method can be found in the method embodiment, which will not be repeated here.

[0074] It will be appreciated by those skilled in the art that embodiments of the present invention may provide methods, systems or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0075] The present invention is described with reference to flowcharts and / or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as a combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0076] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0077] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0078] It should be pointed out that the specific implementation methods described above can enable those skilled in the art to understand the invention more comprehensively, but do not limit the invention in any way. Therefore, although the invention has been described in detail in this specification and embodiments, those skilled in the art should understand that the invention can still be modified or replaced by equivalents; and all technical solutions and improvements that do not deviate from the spirit and scope of the invention are included in the protection scope of the patent for the invention. Any figure mark in the claims should not be regarded as limiting the claims involved. Any simple change or equivalent replacement of the technical solution that can be obviously obtained by any technician familiar with the field within the technical scope disclosed in the present invention belongs to the protection scope of the present invention.

Claims

1. A method for drawing a flood economic loss map, characterized in that: The following steps are involved: Establish a flood evolution model for the study area; conduct flood impact analysis based on the layer information of the flood evolution model to obtain the maximum flooding depth in the study area and the area corresponding to the maximum flooding depth area; Obtain the socio-economic property data of each industry in the study area, and calculate the economic density of each industry in the study area based on the socio-economic property data of each industry; obtain the flood property loss rate based on the industry type in the study area and the maximum flooding depth of each industry type; calculate the economic property loss value of each industry based on the area, economic density and flood property loss rate corresponding to the maximum flooding depth area; The economic property loss values ​​of each industry are plotted as a flood economic loss map.

2. A method for drawing a flood economic loss map according to claim 1, characterized in that: The method of obtaining the socio-economic property data of each industry in the study area is specifically to obtain the land use type and various socio-economic property data of the study area, divide the various socio-economic property data into different industries according to the land use type, and sum the various socio-economic property data by industry within a set time period to obtain the socio-economic property data of each industry.

3. A method for drawing a flood economic loss map according to claim 1, characterized in that: The economic density of each industry in the study area is calculated based on the socio-economic property data of each industry, specifically through the following formula: W im =W i / A im ; Among them, W im W is the property value per unit area of ​​the i-th property in the m-th land use type space in the study area; i is the total value of property type i in the study area; A im is the total area of ​​land of type m corresponding to the total value of property of type i in the study area.

4. A method for drawing a flood economic loss map according to claim 1, characterized in that: The economic and property loss values ​​of various industries are calculated based on the area, economic density and flood property loss rate corresponding to the maximum flooding depth area, and are specifically calculated using the following formula: S i =∑W ni A n L nij ; Among them, S i is the total loss value of the i-th type of property in the flooded area, W ni A is the unit area property value of the i-type property in the n-th unit grid within the flooded area, n is the area of ​​the nth grid, L nij is the property loss rate of type i property distributed in the nth unit grid under the maximum flooding depth level j.

5. A method for drawing a flood economic loss map according to claim 1, characterized in that: The economic and property loss values ​​of the various industries are plotted as a flood economic loss map. Specifically, the economic loss data calculation results of various industries in the flooded range are made into a layer in ArcGIS, and different colors are used to represent different economic loss levels, which is superimposed on the corresponding map.

6. A method for drawing a flood economic loss map according to claim 1, characterized in that: The flood evolution model of the study area specifically interpolates the DEM data of the study area into the terrain file; uses the designed flood process line as the upstream flow data for modeling, sets the parameters of the model, and constructs the flood evolution model of the study area through MIKE21.

7. A method for drawing a flood economic loss map according to claim 1, characterized in that: The industries mentioned specifically include agriculture, fishery, animal husbandry, industry, towns and rural areas.

8. A flood economic loss map drawing system, characterized in that: include: The flood impact analysis module is used to establish a flood evolution model for the study area; perform flood impact analysis based on the layer information of the flood evolution model to obtain the maximum flooding depth of the study area and the area corresponding to the maximum flooding depth area; A data module is used to obtain the socio-economic property data of each industry in the study area, calculate the economic density of each industry in the study area based on the socio-economic property data of each industry; obtain the flood property loss rate based on the industry type in the study area and the maximum flooding depth of each industry type; and calculate the economic property loss value of each industry based on the area, economic density and flood property loss rate corresponding to the maximum flooding depth area; The loss map drawing module is used to draw the economic property loss values ​​of each industry into a flood economic loss map.

9. A computer device comprising a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is loaded into a processor, the computer program can execute the steps of the method according to any one of claims 1 to 7.

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