A hydrological storm flood rule analysis method and system

Abstract

The application relates to a hydrological storm flood rule analysis method and system, and relates to the technical field of hydrological analysis, which comprises the following steps: collecting a basic base map, basic spatial parameters and vector river data; obtaining a water flow direction through the basic base map; obtaining a watershed outlet based on the water flow direction and the basic base map; obtaining a watershed boundary by combining the watershed outlet, the water flow direction and the basic spatial parameters; obtaining a watershed area based on the watershed boundary; obtaining segmented slope information by combining the vector river data and the water flow direction; obtaining a storm flood speed parameter by combining the segmented slope information, the water flow direction and the vector river data; combining the segmented slope information, the water flow direction, the watershed outlet, the watershed boundary and the storm flood speed parameter to obtain a design storm, and uploading and outputting the design storm. The application has the effect of improving the efficiency of hydrological analysis.

Claims

1. A method for analyzing the patterns of hydrological stormwater floods, characterized in that, include: S10: Collect the base map, the basic spatial parameters corresponding to the base map, and vector river data; S11: Obtain the direction of water flow from the base map; S12: Obtain the watershed outlet based on the water flow direction and the base map; S13: Combine the watershed outlet and water flow direction with basic spatial parameters to obtain the watershed boundary; S14: Obtain the catchment area based on the watershed boundary; S15: Obtain segmented gradient information by using vector river data and water flow direction; S16: Combine segmented gradient information, water flow direction, and vector river data to obtain storm flood velocity parameters; S17: Combine segmented gradient information, water flow direction, watershed outlet, watershed boundary, and rainstorm-flood velocity parameters to obtain the design rainstorm, and upload and output the design rainstorm. The verification methods for designing rainstorms include: S40: Obtain the cumulative flow based on the water flow direction and the base map; S41: Compare the cumulative flow with the preset baseline cumulative flow to obtain the estimated bifurcation point; S42: Based on the estimated bifurcation point, the preset diversion characteristics, and the base map, the estimated hill range is obtained; S43: Retrieve the estimated elevation values ​​of the estimated hilly area from the base map; S44: Calculate the difference between adjacent estimated elevation values ​​within the estimated hilly area as the estimated elevation deviation value. S45: Compare the predicted elevation deviation value with the preset benchmark elevation range and combine it with the predicted hill range to obtain the detected hill range. S46: Update the design stormwater based on the extent of the hilly terrain detected; Methods for updating design stormwater based on the extent of hilly terrain include: S50: Collect and monitor information and mark rainstorm data in the hilly area; S51: Obtain the hilly watershed area based on the detected hilly area and watershed area; S52: The actual impact flow is calculated by labeling rainstorm data, hilly watershed area, and monitoring information; S53: Obtain the hill resistance flow rate based on the estimated elevation value, detection information, detection hill range and actual impact flow; S54: Compare the actual impact flow rate with the hilly resistance flow rate to calculate the flow deviation value; S55: Obtain the hill resistance time based on the flow deviation value, detection information, and the detection range of the hills; S56: Update design storms based on hill resistance duration and labeled storm data; Methods for obtaining hill resistance flow include: S60: Retrieve channel roughness from vector river data for detection of hilly areas; S61: Retrieve the river width within the hilly area from vector river data; S62: Obtain hill slope information based on the detected hill range and segmented slope information; S63: Combine information on river channel roughness, river channel width, actual impact flow, and hill slope to determine the height of the obstructed flow. S64: Retrieve the hill erosion resistance coefficient from the detection information and obtain the hill width based on the detected hill range; S65: The hill's resistance flow rate is obtained based on the hill's erosion resistance coefficient, hill width, and the height of the water flow obstruction. Also includes: S70: Based on labeled heavy rainfall data, the maximum duration of rainfall is obtained; S71: Compare the maximum duration of rainfall with the duration of hill resistance to obtain the duration deviation value; S72: Based on the duration deviation value, design rainstorm and detection information to obtain the height of water flow exceeding the target height; S73: Compare the exceedance of the water flow height with the preset reference water flow height and combine the water flow direction to obtain the confluence direction; S74: Obtain the confluence impact flow rate based on the confluence direction and the actual impact flow rate; S75: Update the design storm based on the confluence impact flow and incorporate the hill resistance duration into the design storm.

2. The method for analyzing the patterns of hydrological stormwater and flood according to claim 1, characterized in that, Methods for determining the direction of water flow include: S20: Rasterize the base map to obtain the detection raster; S21: Obtain a marked grid based on the detected grid; S22: Collect the marker elevation value of the marker raster; S23: Obtain adjacent elevation values ​​by marking the grid and the preset detection range; S24: Retrieve the detection distance between the grid cells with adjacent elevation values ​​and the marked grid cells from the detection range; S25: Combine the marked elevation value, adjacent elevation values, and detection distance to calculate the distance weighted drop; S26: Use the detection grid corresponding to the maximum distance weight drop as the drop grid; S27: Obtain the direction of water flow based on the marked grid and the drop grid.

3. The method for analyzing the patterns of hydrological stormwater floods according to claim 2, characterized in that, Methods for obtaining segmented gradient information include: S30: Extract the river centerline from vector river data; S31: Obtain the detection centerline based on the direction of water flow and the centerline of the river channel; S32: Combine the detection centerline with the detection grid to obtain the river grid, and collect the river elevation value of the river grid; S33: Obtain the interval elevation value based on the preset interval distance and river elevation value; S34: Calculate the difference between adjacent interval elevation values ​​as the adjacent elevation difference; S35: Calculate the quotient of adjacent elevation differences and interval distances to obtain segmented slope values, and use the segmented slope values ​​as segmented slope information.

4. A hydrological storm flood pattern analysis system, characterized in that, include: The acquisition module is used to acquire the base map, basic spatial parameters, and vector river data. A memory for storing a program that implements the hydrological storm flood pattern analysis method as described in any one of claims 1 to 3; The processor is used to load and execute programs stored in memory.

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