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Small watershed design flood derivation method

A technology for designing floods and small watersheds, which is applied in the fields of water conservancy projects and small watershed design flood calculations. It can solve the problems of low accuracy and achieve high-precision results

Active Publication Date: 2020-06-26
CHINA THREE GORGES UNIV
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Problems solved by technology

[0003] However, when the comprehensive unit line method is used to calculate the design flood process, since the comprehensive unit line is not derived from the rainfall runoff process of the small watershed, the accuracy of the calculation of the small watershed design flood using this unit line is low, and the rainfall runoff of the small watershed needs to be considered process information

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Embodiment 1

[0063] In this embodiment, the design flood calculation of a small watershed in Xiaogan, Hubei is taken as an example to show the effect achieved by the present invention.

[0064] The small watershed is located in the north of the Yangtze River in Hubei Province, at the southern foot of the Dabie Mountains, and in the northern part of the Hanjiang Plain. The main stream has a total length of 5.6km and a drainage area of ​​193km 2 , the terrain of the basin is higher in the northwest and lower in the southeast. The landform is mainly hilly and mountainous, with an altitude between 35 and 285 meters. There are no rainfall and hydrological stations in the basin, but there is a Huayuan hydrological station 4.4 kilometers downstream, which has rainfall runoff data, and there are 7 rainfall stations in the basin above the Huayuan hydrological station, A, B, C, D, E , F, G, these rainfall stations have rainfall data. The embodiment calculates the design flood of the small watershe...

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Abstract

The invention discloses a small watershed design flood derivation method. The method comprises steps of determining a downstream hydrological station of the small watershed, and obtaining informationincluding a watershed DEM map above the hydrological station and the like; loading the obtained information into GIS software, extracting a drainage basin water system, cutting and dividing the drainage basin water system into a plurality of natural sub-drainage basins, endowing hydrological identification numbers, adding hydrological units and generalizing a drainage basin map; obtaining the rainfall runoff process of the annual maximum-session flood of the outlet section of the basin above the hydrological station; establishing a hydrological model of the watershed above the hydrological station; therefore, small-watershed hydrological model parameters capable of reflecting rainfall runoff process information of the small watershed of the to-be-deduced design flood are obtained, the design rainstorm of the small watershed is calculated through a hydrological frequency calculation method, and the design rainstorm is brought into the calibrated small-watershed hydrological model to deduce the design flood process line of the small watershed. According to the method, high-precision design flood capable of reflecting rainfall runoff process information of the small watershed can be obtained through simple operation in the small watershed.

Description

technical field [0001] The invention relates to the field of hydrology and water conservancy, in particular to water conservancy projects in small watersheds, in particular to a method for calculating design floods in small watersheds. Background technique [0002] At present, in order to construct farmland irrigation and drainage projects, bridge and culvert buildings for roads and railways, flood control projects in cities and industrial and mining areas, etc. in small watersheds, the estimation of small watershed design flood is one of the essential steps. The widely used methods for deriving flood in small watershed design are reasoning formula method, empirical formula method, comprehensive unit line method and so on. The reasoning formula method calculates the design rainstorm of the small watershed by the rainstorm formula, uses the loss parameter μ value to calculate the design net rain, and calculates the design flood peak discharge of the small watershed through th...

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Application Information

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IPC IPC(8): G06F30/27G06F30/28G06F113/08
CPCG06N3/126
Inventor 常文娟王煜韩宇平马海波严登华董鑫房昊天
Owner CHINA THREE GORGES UNIV
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