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Small-watershed design flood calculation method

A technology for designing floods and calculation methods, applied in calculations, special data processing applications, instruments, etc., can solve problems such as large differences in calculation results

Inactive Publication Date: 2016-09-28
HOHAI UNIV
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Problems solved by technology

[0003] For rivers in hilly areas, if the river channel characteristics are not considered, and the design flood calculation is simply based on the characteristics of the mountainous river channel in the upper reaches of the basin or the plain channel characteristics in the lower reaches, the calculated results are quite different from the actual ones.

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Embodiment Construction

[0021] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0022] Such as figure 1 As shown, a small watershed design flood calculation method includes the following steps:

[0023] (1) Calculate the design rainstorm of the watershed;

[0024] (2) Calculate the runoff of the watershed;

[0025] (3) Calculate the confluence of the watershed, and classify the entire watershed according to the Froude coefficient of different sections of the watershed. If the Froude coefficient of a certain section of the watershed is greater than or equal to 1, it indicates that the section belongs to the upper hilly river. The inference formula method is used to solve the confluence of hilly rivers in the upper reaches. If the Froude coefficient of a certain river section in the watershed is less than 1, it indicates that the river section belongs to the downstream plain river. The unsteady flow method is used to s...

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Abstract

The invention discloses a small-watershed design flood calculation method. The small-watershed design flood calculation method sequentially comprises calculation of design storm, calculation of runoff and calculation of confluence; according to Froude coefficients of different channel segments of a watershed, the whole watershed is classified; if the Froude coefficient of a certain channel segment of the watershed is greater than or equal to 1, it shows that the channel segment belongs to an upstream hill river; confluence of the upstream hill river is resolved by adopting a reasoning formula method; if the Froude coefficient of a certain channel segment of the watershed is less than 1, it shows that the channel segment belongs to a downstream plain river; and confluence of the downstream plain river is resolved by adopting a unsteady flow method. According to the small-watershed design flood calculation method disclosed by the invention, the characteristics and the water flow characteristics of the upstream hill river and the downstream plain river in the small watershed are distinguished; calculation is carried out by adopting different runoff and confluence calculation methods; and thus, an obtained design flood value is more reasonable and accurate.

Description

technical field [0001] The invention belongs to the technical field of engineering hydrology, and in particular relates to a design flood calculation method for small watersheds. Background technique [0002] Cities are generally located in the lower reaches of river basins with gentle terrain. Because the characteristics of rivers in plain areas and upstream mountainous areas are very different, the characteristics of water flow are also different, so the hydrological calculation methods are also different. [0003] For rivers in hilly areas, if the river channel characteristics are not considered, and the design flood calculation is simply based on the channel characteristics of the upstream mountainous areas or the downstream plain channel characteristics of the basin, the calculated results are quite different from the actual ones. [0004] Therefore, it is necessary to take into account the differences in the characteristics of the upstream and downstream channels of th...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/367Y02A10/40
Inventor 周宏刘俊高成樊旭
Owner HOHAI UNIV
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