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Computing method for design storm flood of mountain flood disaster small watersheds

A technology for designing floods and calculation methods, applied in the direction of calculation, special data processing applications, instruments, etc., to ensure the effect of accuracy

Inactive Publication Date: 2017-07-21
辽宁省水文局
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Problems solved by technology

In Liaoning Province, it is more common to use the reasoning formula method to calculate the storm flood in small watersheds, and the reasoning formula method needs to consider many factors in the calculation process, and the reasoning formula is mainly for small and medium watersheds (300-1000km 2 ) design, for small watersheds (2 ) situation has not improved accordingly, and whether it is suitable for storm floods in ultra-small watersheds remains to be tested

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  • Computing method for design storm flood of mountain flood disaster small watersheds
  • Computing method for design storm flood of mountain flood disaster small watersheds
  • Computing method for design storm flood of mountain flood disaster small watersheds

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Embodiment Construction

[0035] The present invention will be further described in detail below in conjunction with the examples.

[0036] 1. Description of design rainstorm calculation method:

[0037] Using the "Calculation Method for Design Rainstorm and Flood of Small and Medium-sized Rivers (No Data Area) in Liaoning Province" to calculate the typical duration design surface rainstorm calculation formula is as follows:

[0038]

[0039] In the formula: P P面 Rainstorm on the design surface (mm), K P is the modulus coefficient of Pearson type III curve, K F is the point-to-surface conversion coefficient, is the mean value of rainstorm (mm). Will P P面 Substituting P in the following formula 1P ,P 24P .

[0040] The formula for calculating surface rainfall over the time of confluence τ is as follows:

[0041] τ≤1 hour,

[0042] 1

[0043] 6

[0044] In the formula: τ is the confluence duration (h), p τp Design rainstorm amount (mm) for τ duration, P 1P ,P 24P 1h, 24h design rains...

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Abstract

The invention relates to a computing method for design storm flood of mountain flood disaster small watersheds. The computing method comprises the following steps: 1) computing concentration time t diachronic design area rainfall of a representative station; 2) performing rainstorm duration distribution on the t diachronic design area rainfall to obtain a design rain pattern with a time period length of 1 hour; 3) substituting the design rain pattern into a design flood model to obtain the design storm flood, and selecting the design flood model through regional synthesis; and 4) obtaining the design storm flood of other small watersheds of a region according to the design flood model. The rainstorm attenuation index parameter is improved, so the design storm computing method is suitable for the small watersheds; the computing method is determined for the other small watersheds of the region through the regional synthesis; and the accuracy of a computing result is ensured by realistic correction.

Description

technical field [0001] The invention relates to a calculation method for design storm flood, in particular to a design storm flood calculation method for mountain torrent disaster small watersheds. Background technique [0002] The investigation and evaluation of mountain torrent disasters is an important guarantee and basic support for accurate forecast and early warning of mountain torrent defense, safe transfer, and reduction of casualties. Mountain torrent disaster investigation and evaluation includes mountain torrent disaster investigation and mountain torrent disaster analysis and evaluation. The analysis and evaluation of mountain torrent disasters mainly includes the calculation and analysis and evaluation of design storm and flood. The calculation of design storm and flood is to analyze and evaluate the flood control status of villages along the river in the prevention and control area, scientifically divide the mountain torrent disaster risk area, and scientifical...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG16Z99/00Y02A10/40
Inventor 梁凤国顾燕平孙玉华冯琳丁阳高世斌徐敏赵锡钢郭纯一许晓艳梁冰刘和平金鑫叶天舒
Owner 辽宁省水文局
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