DEM-based determination method for flood calculation parameters designed by Huai Shanghai method

By constructing a flow direction raster based on DEM and extracting isochrones using GIS tools, the problem of not considering the spatial heterogeneity of flow velocity in the traditional Huai Shang method is solved, and high-precision and automated calculation of Huai Shang method parameters is achieved.

CN121958699APending Publication Date: 2026-05-01河南省水利勘测设计研究有限公司
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Patent Information

Application Number
CN202610020834.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-08
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

The traditional Huaihe River method fails to consider the spatial heterogeneity of flow velocity in the process of determining isochrones, resulting in low accuracy and strong subjectivity in parameter calculation, making it difficult to achieve automation and efficient calculation.

Method used

Based on DEM data, a flow direction grid was constructed using the D8 algorithm. The underlying surface type was identified by combining satellite imagery, and the roughness and flow velocity were calculated. Isochrones were extracted using GIS tools, and L~B and τ~B curves were constructed to determine the core parameters of the Huai Shang method.

Benefits of technology

It improves the accuracy of isochrones and the automation of parameter calculation, realizes the standardization and efficient acquisition of parameters for the Huaihe River method, and enhances calculation accuracy and efficiency.

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Abstract

The invention discloses a DEM-based determination method for design flood calculation parameters of a Huai Shanghai method, and the method comprises the steps: obtaining a target drainage basin and peripheral DEM data, calculating the water flow direction of each grid through a D8 algorithm, and generating a flow direction grid; determining a main stream position according to the flow direction grid; matching a net rain time period according to the drainage basin area A, and calculating net rain intensity i when net rain in the time period is 20mm; identifying the underlying surface type in combination with a satellite image, and matching the roughness values to form a roughness grid; estimating the flow velocity of each grid through a dynamic wave method; determining an isochrone; constructing an L-B curve and a tau-B curve; and determining core parameters of the Huai Shangshi method. The method has the advantages that the isochrone is determined based on the DEM, the isochrone calculation method is improved, the isochrone determination precision is improved, the L-B curve is reasonably determined, then standard, automatic and high-precision acquisition of seven core parameters of the Huai Shangzhou method is achieved, and the parameter determination efficiency and quality are improved.
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