A method, device, medium and product for determining a reservoir area inundation risk map

Abstract

The present application discloses a method, device, medium and product for determining a reservoir area inundation risk map, which relates to the field of reservoir area inundation analysis. The method includes obtaining the characteristic curve of the target reservoir, the elevation of the dam crest under the reservoir reference elevation system, and the digital elevation model with a preset resolution; using the flood routing calculation rule to determine the highest water level in the reservoir under the reservoir reference elevation system and convert it into the highest water level in the reservoir under the DEM reference elevation; cropping the digital elevation model with the preset resolution to obtain the cropped topographic map layer, intersecting it with the reservoir area location point layer to obtain the inundation range layer, cropping the water surface raster data to obtain the cropped water surface raster data, and combining the digital elevation model with the preset resolution to determine the inundation depth and draw the reservoir area inundation risk map. The present application requires less data and less time for calculation, improving the efficiency and accuracy of reservoir area inundation analysis.

Description

Technical Field

[0001] The present application relates to the field of reservoir area inundation analysis, and particularly to a method, device, medium and product for determining a reservoir area inundation risk map. Background Art

[0002] The compilation and application of flood risk maps, as an essential non-engineering measure in the flood prevention and control system, play a very important role in promoting the optimization and improvement of the basin flood control project system, the scientific management of floodplains, and the prevention of emergency rescue measures. It mainly relies on detailed historical data investigation, flood simulation analysis, etc., and uses thematic maps to simulate and predict the possible evolution routes, inundation ranges and water depths, arrival times and flow velocity distributions of floods in the study area.

[0003] Reservoirs undertaking downstream flood control tasks use the flood control storage capacity reserved in the reservoir area during floods to intercept and stagger flood peaks through flood control operation to ensure downstream flood control safety. Among them, the inundation risk map of the reservoir area is an important part of the required results of the flood risk map, including the inundation range map of the reservoir area, the inundation water depth map, etc. The commonly used method for delineating the inundation range of the reservoir area is to cut the DEM (Digital Elevation Model) grid along the contour line and then extract the contour surface, or to use a hydraulic model for simulation to obtain the inundation situation of the reservoir area under a specific incoming water frequency. However, traditional analysis methods have many drawbacks, such as the existence of isolated islands in the water surface line resulting in inaccurate calculation of the inundation range, complex and time-consuming calculation of the hydraulic model, and inconsistent elevation benchmarks of DEM terrain data from different sources. Therefore, how to improve the calculation efficiency and accuracy of reservoir area inundation analysis is a major difficulty in the compilation of reservoir flood risk maps. Summary of the Invention

[0004] The purpose of the present application is to provide a method, device, medium and product for determining a reservoir area inundation risk map to improve the calculation efficiency and accuracy of reservoir area inundation analysis.

[0005] To achieve the above purpose, the present application provides the following solutions:

[0006] In the first aspect, the present application provides a method for determining a reservoir area inundation risk map, including:

[0007] Obtain the reservoir water level-capacity-area curve, reservoir water level-discharge capacity curve, crest elevation under the reservoir reference elevation system, and digital elevation model with a preset resolution of the target reservoir;

[0008] According to the reservoir water level-discharge capacity curve and the preset flood volume level, use the flood routing rules to determine the highest water level in the reservoir area of the target reservoir under the reservoir reference elevation system;

[0009] Convert the highest water level in the reservoir area under the reservoir reference elevation system to the highest water level in the reservoir area under the DEM reference elevation system according to the elevation of the dam crest under the reservoir reference elevation system and the digital elevation model with a preset resolution.

[0010] Clip the digital elevation model with a preset resolution according to the highest water level in the reservoir area under the DEM reference elevation system to obtain the clipped topographic map layer.

[0011] Intersect the clipped topographic map layer and the reservoir area location point layer to obtain the inundation range layer; the inundation range layer contains a fixed value of the inundation area ratio; the fixed value of the inundation area ratio is determined according to the reservoir water level - storage capacity - area curve.

[0012] Clip the water surface raster data of the target reservoir based on the inundation range layer to obtain the clipped water surface raster data; the water surface raster data is determined according to the highest water level in the reservoir area of the target reservoir.

[0013] Determine the inundation depth according to the clipped water surface raster data and the digital elevation model with a preset resolution, and draw the inundation risk map of the reservoir area of the target reservoir.

[0014] Optionally, the reservoir water level - storage capacity - area curve, the reservoir water level - discharge capacity curve, and the elevation of the dam crest under the reservoir reference elevation system are determined based on the preliminary design report and the flood control and emergency response plan report of the target reservoir.

[0015] Optionally, according to the reservoir water level - discharge capacity curve and the preset flood volume level, use the flood routing rules to determine the highest water level in the reservoir area of the target reservoir under the reservoir reference elevation system, specifically including:

[0016] Perform flood routing on the target reservoir based on the preset flood volume level to obtain the inflow flood process.

[0017] According to the inflow flood process and the reservoir water level - discharge capacity curve, use the flood routing rules to determine the highest water level in the reservoir area of the target reservoir under the reservoir reference elevation system.

[0018] Optionally, according to the elevation of the dam crest under the reservoir reference elevation system and the digital elevation model with a preset resolution, convert the highest water level in the reservoir area under the reservoir reference elevation system to the highest water level in the reservoir area under the DEM reference elevation system, specifically including:

[0019] Determine the difference between the elevation of the dam crest under the reservoir reference elevation system and the elevation of the dam crest in the digital elevation model with a preset resolution.

[0020] Based on the difference, convert the highest water level in the reservoir area under the reservoir reference elevation system to the highest water level in the reservoir area under the DEM reference elevation system.

[0021] Optionally, according to the highest water level in the reservoir area under the DEM reference elevation system, the digital elevation model with a preset resolution is cropped to obtain the cropped topographic map layer, which specifically includes:

[0022] Determine the contour threshold according to the highest water level in the reservoir area under the DEM reference elevation system;

[0023] Draw the surface layer according to the contour threshold and the lower boundary; the lower boundary is the dam body and its extended road;

[0024] Based on the surface layer, crop the digital elevation model with a preset resolution and perform binarization processing on the cropped digital elevation model to obtain a binarized digital elevation model;

[0025] Convert the binarized digital elevation model into a surface to obtain the cropped topographic map layer.

[0026] Optionally, intersect the cropped topographic map layer and the reservoir area location point layer, and delete the non-intersecting isolated island surfaces to obtain the inundation range layer.

[0027] Optionally, according to the cropped water surface raster data and the digital elevation model with a preset resolution, determine the inundation depth and draw the inundation risk map of the target reservoir, which specifically includes:

[0028] Subtract the cropped water surface raster data from the digital elevation model with a preset resolution to obtain the inundation depth;

[0029] Based on the raster file of the inundation depth, draw the inundation risk map of the target reservoir.

[0030] In a second aspect, the present application provides a computer device, including: a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor executes the computer program to implement the method for determining the inundation risk map of the reservoir area as described in any one of the above.

[0031] In a third aspect, the present application provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the method for determining the inundation risk map of the reservoir area as described in any one of the above.

[0032] In a fourth aspect, the present application provides a computer program product, including a computer program, and when the computer program is executed by a processor, it implements the method for determining the inundation risk map of the reservoir area as described in any one of the above.

[0033] According to the specific embodiments provided by the present application, the present application has the following technical effects:

[0034] The present application provides a method, device, medium and product for determining a reservoir area inundation risk map, which includes obtaining the reservoir water level - storage capacity - area curve, the reservoir water level - discharge capacity curve, the dam crest elevation under the reservoir reference elevation system, and a digital elevation model with a preset resolution of a target reservoir; determining the highest water level in the reservoir area of the target reservoir under the reservoir reference elevation system according to the reservoir water level - discharge capacity curve and a preset flood volume level by using flood routing rules; converting the highest water level in the reservoir area under the reservoir reference elevation system into the highest water level in the reservoir area under the DEM reference elevation system according to the dam crest elevation under the reservoir reference elevation system and the digital elevation model with a preset resolution; cropping the digital elevation model with a preset resolution according to the highest water level in the reservoir area under the DEM reference elevation system to obtain a cropped topographic map layer; intersecting the cropped topographic map layer and the reservoir area location point layer to obtain an inundation range layer; cropping the water surface raster data of the target reservoir based on the inundation range layer to obtain cropped water surface raster data; and determining the inundation depth according to the cropped water surface raster data and the digital elevation model with a preset resolution, and drawing the reservoir area inundation risk map of the target reservoir. The present application can calculate the inundation area and inundation depth of the reservoir area more accurately, not only avoiding the errors caused by different elevation reference data, but also using flood routing rules for flood deduction, and the calculation time will be much less than that of traditional hydraulic model simulation methods, which can effectively improve the efficiency and accuracy of reservoir area inundation analysis. Brief Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0036] Figure 1 It is a schematic flowchart of a method for determining a reservoir area inundation risk map provided by an embodiment of the present application;

[0037] Figure 2 It is a technical flowchart of a method for determining a reservoir area inundation risk map provided by an embodiment of the present application;

[0038] Figure 3 It is a water level - storage capacity - area curve graph of Reservoir A provided by an embodiment of the present application;

[0039] Figure 4 It is a water level - discharge capacity relationship curve graph of Reservoir A provided by an embodiment of the present application;

[0040] Figure 5 It is a schematic diagram of the DEM cropping result provided by an embodiment of the present application;

[0041] Figure 6 Schematic diagram of the calculation result of the inundation range of the reservoir area provided by the embodiment of the present application;

[0042] Figure 7 Schematic diagram of the calculation result of the inundation depth of the reservoir area provided by the embodiment of the present application;

[0043] Figure 8 Schematic diagram of the calculation result of the inundation of the reservoir area with unreasonably selected boundaries provided by the embodiment of the present application;

[0044] Figure 9 Schematic diagram of the calculation result of the inundation of the reservoir area without reasonable elevation conversion provided by the embodiment of the present application;

[0045] Figure 10 Schematic diagram of the structure of a computer device provided by an embodiment of the present application. Specific implementation manners

[0046] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0047] To make the above objects, features, and advantages of the present application more obvious and understandable, the present application will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0048] In an exemplary embodiment, as Figure 1 and Figure 2 shown, a method for determining the inundation risk map of a reservoir area is provided, including the following steps:

[0049] S1: Obtain the reservoir water level - storage capacity - area curve, reservoir water level - discharge capacity curve, crest elevation under the reservoir reference elevation system, and digital elevation model with a preset resolution of the target reservoir.

[0050] In this embodiment, the reservoir water level - storage capacity - area curve, reservoir water level - discharge capacity curve, and crest elevation under the reservoir reference elevation system are determined based on the preliminary design report and flood control and emergency response plan report of the target reservoir.

[0051] In practical applications, clarify the research object and its characteristics, and obtain its relevant basic data.

[0052] Obtain basic materials such as the preliminary design report of the target reservoir and the flood control and emergency rescue plan report, and sort out materials such as the water level - storage capacity - area curve of the reservoir, the water level - discharge capacity curve of the reservoir, the crest elevation of the dam, and the flood regulation calculation rules; at the same time, determine the flood volume level (preset flood volume level) to be calculated for inundation and the high - resolution (preset resolution not less than 30m) DEM of the corresponding reservoir area.

[0053] Furthermore, in this embodiment, taking a certain reservoir A (target reservoir) in Anhui Province as an example, through searching relevant materials, "Preliminary Design of Reservoir A", "Annual Flood Control and Emergency Rescue Plan (Draft for Approval) of Reservoir A" and the high - resolution DEM with a resolution not less than 30m of the river basin where the reservoir is located are obtained. By consulting materials, Reservoir A is located in Anhui Province and belongs to the Chuhuai River system of the Yangtze River Basin. The dam is a homogeneous earth dam, with a crest elevation of 52.7m (the same as the waste Yellow River elevation system, hereinafter the same), and the maximum dam height is 13.60m. The catchment area at the dam site of the reservoir is 20.0 km 2 , the flood - limit water level is 49.60m, the design flood level is 50.72m, the check flood level is 51.33m, and the total storage capacity is 9.27 million m 3 . Obtain the relevant data of its water level - storage capacity - area relationship as Figure 3 , and the relevant data of the water level - discharge capacity relationship as Figure 4 . Select the design flood (recurrence period of 50 years) of Reservoir A for flood regulation calculation.

[0054] S2: According to the water level - discharge capacity curve of the reservoir and the preset flood volume level, use the flood regulation calculation rules to determine the highest water level in the reservoir area of the target reservoir under the reservoir's reference elevation system.

[0055] As an optional implementation method, S2 specifically includes:

[0056] S21: Based on the preset flood volume level, perform flood regulation calculation on the target reservoir to obtain the inflow flood process.

[0057] S22: According to the inflow flood process and the water level - discharge capacity curve of the reservoir, use the flood regulation calculation rules to determine the highest water level in the reservoir area of the target reservoir under the reservoir's reference elevation system.

[0058] In practical applications, perform flood regulation calculation to calculate the highest water level in the reservoir area.

[0059] The flood of Reservoir A is formed by rainfall, and the seasonal characteristics, spatial and temporal variations of the flood are consistent with the local heavy rainfall. Considering that there is no measured and flood restoration data, according to the current "Guidelines for Safety Evaluation of Reservoir Dams", "Code for Calculation of Design Flood of Water Resources and Hydropower Projects" and other regulations, the design flood is calculated by the indirect method, that is, the method of indirectly deriving the flood from rainfall data is used to calculate the design flood process (inflow flood process).

[0060] The current flood discharge facilities of Reservoir A only include a normal spillway, which is a broad-crested weir structure. The flow formula for broad-crested weir flow is used:

[0061] .

[0062] In the formula: is the number of holes, is the net width of a single hole, is the discharge coefficient, is the head over the weir considering the approach velocity, , is the head over the weir; is the acceleration due to gravity, generally taken as 9.81 m / s², is the velocity of the channel in front of the weir, is the submergence coefficient, is the side contraction coefficient.

[0063] Perform flood routing calculations. Combining with the design flood process of the preset flood volume level determined in step S1 and the static storage flood routing method, calculate the highest flood routing water level (the highest water level in the reservoir area under the reservoir reference elevation system) at this flood volume level.

[0064] In this embodiment, taking the design flood of Reservoir A (return period of 50 years) as an example, perform flood routing calculations with a calculation step of 1 h. The calculation results of the flood process are shown in Table 1.

[0065] Table 1 Results of the design flood process

[0066]

[0067] The error between the calculated flood results and the inflow peak discharge in the "Preliminary Design of Reservoir A" report is within 5%, which is relatively accurate. Combining with the flood process, according to the static storage flood routing method, it can be obtained that under the design flood process, the highest water level of Reservoir A is 50.74 m, with a difference of within 0.5% from the design water level of 50.72 m in the "Preliminary Design of Reservoir A" report, which is relatively accurate.

[0068] S3: According to the elevation of the dam crest under the reservoir reference elevation system and the digital elevation model with a preset resolution, convert the highest water level in the reservoir area under the reservoir reference elevation system to the highest water level in the reservoir area under the DEM reference elevation system.

[0069] As an optional implementation method, S3 specifically includes:

[0070] S31: Determine the difference between the elevation of the dam crest under the reservoir reference elevation system and the elevation of the dam crest in the digital elevation model with a preset resolution.

[0071] S32: Based on the difference, convert the highest water level in the reservoir area under the reservoir reference elevation system to the highest water level in the reservoir area under the DEM reference elevation system.

[0072] In practical applications, convert the reservoir elevation system and the elevation system of topographic data.

[0073] Utilize the elevation difference of the dam crest under different elevation systems to convert the reservoir reference elevation system to an elevation reference consistent with the DEM used.

[0074] In this embodiment, the DEM resolution adopted is 12.5m, and the scope covers the Chuyu River Basin where Reservoir A is located; the dam crest elevation under the reservoir reference elevation system is 52.7m, and the dam crest elevation in the DEM is 56.4m, with a difference of 3.7m between the two. Therefore, to convert the reservoir reference elevation system to be consistent with the local reference elevation of the DEM, it is necessary to add 3.7m to the highest water level in the reservoir area under the reservoir reference elevation system. The highest flood regulation water level after elevation conversion (the highest water level in the reservoir area under the DEM reference elevation system) is 54.44m.

[0075] S4: According to the highest water level in the reservoir area under the DEM reference elevation system, crop the digital elevation model with a preset resolution to obtain the cropped topographic map layer.

[0076] As an optional implementation manner, S4 specifically includes:

[0077] S41: Determine the contour threshold according to the highest water level in the reservoir area under the DEM reference elevation system.

[0078] S42: Draw the surface layer according to the contour threshold and the lower boundary; the lower boundary is the dam body and its extended road.

[0079] S43: Based on the surface layer, crop the digital elevation model with a preset resolution and perform binarization processing on the cropped digital elevation model to obtain a binarized digital elevation model;

[0080] S44: Convert the binarized digital elevation model to a surface to obtain the cropped topographic map layer.

[0081] In practical applications, crop and filter the topographic data raster as follows:

[0082] According to the highest flood regulation water level, add 1m to 2m on this basis as the contour threshold, use the dam body and its extended road as the lower boundary to draw the surface layer, mask and crop the DEM, and perform binarization processing. Set the DEM raster lower than the highest flood regulation water level to 1 and the raster higher than the highest flood regulation water level to null value; then, convert the obtained binarized DEM to a surface, merge adjacent and same-value units into one surface to obtain the cropped topographic map layer.

[0083] In this embodiment, the maximum flood regulation water level of 54.44 m after elevation conversion is lower than the dam crest elevation. Therefore, the contour threshold can be set to be consistent with the dam crest elevation, that is, 56.4 m. And there is a highway in the north of the reservoir, and its flood control standard is higher than the regional flood control standard. Therefore, it can be regarded as the upper boundary of the reservoir area inundation. The surface layer is initially drawn, and the DEM is masked and cropped. The result is as Figure 5 shown. The DEM grid is screened according to the highest water level of 54.44 m in the reservoir.

[0084] S5: Intersect the cropped topographic map surface layer and the reservoir area location point layer to obtain the inundation range layer; the inundation range layer contains the fixed value of the inundation area ratio; the fixed value of the inundation area ratio is determined according to the reservoir water level-capacity-area curve.

[0085] As an alternative implementation, intersect the cropped topographic map surface layer and the reservoir area location point layer, and delete the non-intersecting isolated island surfaces to obtain the inundation range layer.

[0086] In practical applications, intersect the reservoir area location point layer with the cropped topographic layer to obtain the inundation range layer, specifically as follows:

[0087] Create a new reservoir area location point layer, and the points are located at any position within the water surface range of the reservoir area. Intersect the cropped topographic map surface layer with the reservoir area location point layer, and delete the non-intersecting isolated island surfaces to obtain the inundation range layer. According to the reservoir water level-capacity-area curve, preliminarily estimate the inundation area under the maximum flood regulation water level of the reservoir, and use it as the fixed value of the inundation area ratio of the inundation range layer.

[0088] In this embodiment, the inundation result of Reservoir A is as Figure 6 shown, and the inundation area is about 1.99 km 2 . According to the reservoir water level-capacity-area curve, through linear interpolation, when the water level is 50.58 m, the water surface area is about 1.92 km 2 , with a small error and a reasonable result.

[0089] S6: Crop the water surface grid data of the target reservoir based on the inundation range layer to obtain the cropped water surface grid data; the water surface grid data is determined according to the highest water level within the reservoir area of the target reservoir.

[0090] S7: Determine the inundation depth according to the cropped water surface grid data and the digital elevation model with a preset resolution, and draw the inundation risk map of the reservoir area of the target reservoir.

[0091] As an alternative implementation, S7 specifically includes:

[0092] S71: Subtract the cropped water surface raster data from the digital elevation model with a preset resolution to obtain the inundation depth.

[0093] S72: Based on the raster file of the inundation depth, draw the inundation risk map of the target reservoir area.

[0094] In practical applications, calculate the inundation depth, count the inundation indicators, and draw the inundation risk map of the reservoir area as follows:

[0095] Create a new raster dataset (i.e., the water surface raster data of the target reservoir), whose area should be the same as the cropped topographic map layer in the previous step, and the elevation values should all be the highest flood control water level after elevation conversion obtained in the previous step. Subtract it from the DEM with a preset resolution to obtain the inundation depth index and draw the flood inundation risk map of the reservoir area.

[0096] In this embodiment, the inundation depth results of the reservoir area of Reservoir A are as Figure 7 shown.

[0097] For the effect analysis of this application, the inundation analysis results of the reservoir area without reasonable elevation conversion, boundary selection, and without dealing with the isolated islands are compared. The inundation results are as Figure 8 and Figure 9 shown. It can be seen from Figure 8 that the unreasonable selection of the boundary has led to the inundation range exceeding the highway in the north of the reservoir, and the inundation area is relatively large, about 2.46 km 2 ; it can be seen from Figure 9 that the unreasonable elevation conversion has led to a relatively small inundation area, about 1.39 km 2 ; and neither of them has dealt with the isolated islands. For example, on the west side of the south Figure 8 and the west side of the north Figure 9 adopting the isoline method, these isolated islands are not continuous with the water surface of the reservoir area and should not belong to the inundation area nor be included in the inundation area. In summary, the results of both are very different from the inundation area results in the "Preliminary Design of Reservoir A" report and are far less than the results obtained in this application. The specific results are shown in Table 2.

[0098] Table 2 Comparison of results of different reservoir area treatment methods

[0099]

[0100] From the above analysis, it can be obtained that a method for determining the inundation risk map of a reservoir area proposed in this application can calculate the inundation area and inundation depth of the reservoir area more accurately. It not only avoids the errors caused by different elevation datum data but also the calculation time will be much less than that of the traditional hydraulic model simulation method, which can effectively improve the efficiency and accuracy of the inundation analysis of the reservoir area.

[0101] In an exemplary embodiment, a computer device is provided, which includes a memory and a processor. A computer program is stored in the memory, and when the processor executes the computer program, the above-mentioned method for determining the inundation risk map of the reservoir area is implemented.

[0102] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, and when the computer program is executed by a processor, the above-mentioned method for determining the inundation risk map of the reservoir area is implemented.

[0103] In an exemplary embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the above-mentioned method for determining the inundation risk map of the reservoir area is implemented.

[0104] In an exemplary embodiment, a computer device is provided. The computer device can be a server or a terminal, and its internal structural diagram can be as Figure 10 shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, abbreviated as I / O), and a communication interface. Among them, the processor, the memory, and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used for exchanging information between the processor and external devices. The communication interface of the computer device is used for communicating with an external terminal through a network connection. When the computer program is executed by the processor, a method for determining the inundation risk map of the reservoir area is implemented.

[0105] Those skilled in the art can understand that Figure 10 the structure shown in

[0106] is only a block diagram of some structures related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements.

[0107] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memories. Non-volatile memories can include read-only memory (ROM), magnetic tapes, floppy disks, flash memories, optical memories, high-density embedded non-volatile memories, resistive random access memories (ReRAM), magnetoresistive random access memories (MRAM), ferroelectric random access memories (FRAM), phase change memories (PCM), graphene memories, etc. Volatile memories can include random access memory (RAM) or external cache memories, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0108] The databases involved in the embodiments provided in the present application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., without limitation. The processors involved in the embodiments provided in the present application can be general-purpose processors, central processors, graphics processors, digital signal processors, programmable logics, data processing logics based on quantum computing, etc., without limitation.

[0109] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as these technical feature combinations do not conflict, they should be considered to be within the scope described in this specification.

[0110] In this article, specific examples are used to elaborate on the principles and implementation manners of the present application. The descriptions of the above embodiments are only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A method for determining the inundation risk map of a reservoir area, characterized in that Including: Obtaining the reservoir water level - storage capacity - area curve, the reservoir water level - discharge capacity curve, the dam crest elevation under the reservoir reference elevation system, and the digital elevation model with a preset resolution of the target reservoir; Determining the highest water level in the reservoir area of the target reservoir under the reservoir reference elevation system according to the reservoir water level - discharge capacity curve and the preset flood volume level by using the flood regulation calculation rules; Determining the highest water level in the reservoir area of the target reservoir under the reservoir reference elevation system according to the reservoir water level - discharge capacity curve and the preset flood volume level by using the flood regulation calculation rules, specifically including: Performing flood regulation calculation on the target reservoir based on the preset flood volume level to obtain the inflow flood process; Determining the highest water level in the reservoir area of the target reservoir under the reservoir reference elevation system according to the inflow flood process and the reservoir water level - discharge capacity curve by using the flood regulation calculation rules; the flood regulation calculation rules adopt the static storage capacity flood regulation method; Converting the highest water level in the reservoir area under the reservoir reference elevation system to the highest water level in the reservoir area under the DEM reference elevation system according to the dam crest elevation under the reservoir reference elevation system and the digital elevation model with a preset resolution; Clipping the digital elevation model with a preset resolution according to the highest water level in the reservoir area under the DEM reference elevation system to obtain the clipped topographic map layer; Clipping the digital elevation model with a preset resolution according to the highest water level in the reservoir area under the DEM reference elevation system to obtain the clipped topographic map layer, specifically including: Determining the contour threshold according to the highest water level in the reservoir area under the DEM reference elevation system; Drawing the area layer according to the contour threshold and the lower boundary; the lower boundary is the dam body and its extended road; Based on the area layer, clipping the digital elevation model with a preset resolution and performing binary processing on the clipped digital elevation model to obtain the binary digital elevation model; Converting the binary digital elevation model into a surface to obtain the clipped topographic map layer; Intersecting the clipped topographic map layer and the reservoir area location point layer, and deleting the non - intersecting isolated island surfaces to obtain the inundation range layer; the inundation range layer contains the fixed inundation area ratio value; the fixed inundation area ratio value is determined according to the reservoir water level - storage capacity - area curve; Clipping the water surface raster data of the target reservoir based on the inundation range layer to obtain the clipped water surface raster data; the water surface raster data is determined according to the highest water level in the reservoir area of the target reservoir; Determining the inundation depth according to the clipped water surface raster data and the digital elevation model with a preset resolution, and drawing the reservoir area inundation risk map of the target reservoir.

2. The method for determining the reservoir area inundation risk map according to claim 1, characterized in that The reservoir water level - storage capacity - area curve, the reservoir water level - discharge capacity curve, and the dam crest elevation under the reservoir reference elevation system are determined based on the preliminary design report and the flood control and emergency rescue plan report of the target reservoir.

3. The method for determining the reservoir inundation risk map according to claim 1, wherein Converting the highest water level in the reservoir area under the reservoir reference elevation system to the highest water level in the reservoir area under the DEM reference elevation system according to the dam crest elevation under the reservoir reference elevation system and the digital elevation model with a preset resolution, specifically including: Determining the difference between the dam crest elevation under the reservoir reference elevation system and the dam crest elevation in the digital elevation model with a preset resolution; Based on the difference, convert the highest water level in the reservoir area under the reservoir reference elevation system to the highest water level in the reservoir area under the DEM reference elevation system.

4. The method for determining the reservoir area inundation risk map according to claim 1, wherein According to the cropped water surface raster data and the digital elevation model with a preset resolution, determine the inundation depth and draw the inundation risk map of the target reservoir area, specifically including: Subtract the cropped water surface raster data from the digital elevation model with a preset resolution to obtain the inundation depth; Based on the raster file of the inundation depth, draw the inundation risk map of the target reservoir area.

5. A computer device, comprising: A memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor executes the computer program to implement the method for determining the inundation risk map of the reservoir area according to any one of claims 1-4.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the method for determining the inundation risk map of the reservoir area according to any one of claims 1-4.

7. A computer program product comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the method for determining the inundation risk map of the reservoir area according to any one of claims 1-4.

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