Numerical simulation method combining kinematic waves with dynamic waves for flood process in mountainous area

A numerical simulation and dynamic wave technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., to achieve the effect of ensuring stability and improving practical application capabilities

Active Publication Date: 2017-12-08
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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Problems solved by technology

[0006] The object of the present invention is to provide a kind of numerical simulation method of flood process in mountainous area which combines kinematic wave and dynamic wave. The practicability of ...

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  • Numerical simulation method combining kinematic waves with dynamic waves for flood process in mountainous area
  • Numerical simulation method combining kinematic waves with dynamic waves for flood process in mountainous area
  • Numerical simulation method combining kinematic waves with dynamic waves for flood process in mountainous area

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Embodiment 1

[0036]The invention provides a numerical simulation method for flood process in mountainous area by combining motion wave and dynamic wave. Before the simulation, it is necessary to collect mountainous watershed terrain data, land use type data and rainfall process data through instrumental measurements or local hydrological data. This method combines the kinematic wave and the dynamic wave conveniently under the numerical discrete framework of the unstructured finite volume, which can give full play to the advantages of each method and improve the practicability of the hydrodynamic model in the field of rainfall runoff calculation. The specific process is as follows:

[0037] (1) Grid discretization and conventional parameter assignment. Triangular unstructured grids are used to discrete mountain watersheds, and the grids of the channel parts are properly densified. The terrain data is used to interpolate the grid nodes and the grid cores to obtain the elevation data at the ...

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Abstract

The invention discloses a numerical simulation method combining kinematic waves with dynamic waves for a flood process in a mountainous area. According to the method, on the basis of a triangular unstructured mesh finite volume numerical discretization frame, kinematic wave and dynamic wave control equations are both in conservation forms, variables have cell centers, and the discretization format is a Godunov format. Solution methods are distinguished by conducting property assignment on a grid cell solver, when the property is 0, the kinematic wave control equation is solved, and when the property is 1, the dynamic wave control equation is solved. The continuous equations of the kinematic waves and dynamic waves are same, and continuous equations of all grid cells are uniformly solved in a Roe format. When the grid property is 0, a kinematic wave momentum equation is adopted to directly solve conservation variables of the next moment; when the grid property is 1, interfacial momentum numerical flux is calculated in a Roe format, and conservation variables of the next moment are solved by the summation of the momentum flux, bottom slope items and frictional items. According to the method, the practical application capability of a hydrodynamic model during simulation of the flood process in the mountainous area can be effectively improved, and the deficiency of current hydrologic methods is made up.

Description

technical field [0001] The invention relates to the field of water conservancy engineering, in particular to the field of mountain torrent prevention and control, in particular to a numerical simulation method for flood process in mountainous areas by combining motion waves and dynamic waves. Background technique [0002] China's mountainous area accounts for about two-thirds of the land area, of which the mountain torrent disaster prevention and control area reaches 4.63 million km 2 , the area of ​​the key prevention and control area is 970,000 km 2 . The flood process in the hilly area rises and falls steeply, with fast flow and strong destructive power, which often induces geological disasters such as landslides and mud-rock flows, which are extremely harmful. [0003] At present, hydrological methods are mainly used in mountainous flood analysis and calculation. Hydrological methods are further divided into two categories, one is empirical or semi-empirical methods s...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23Y02A10/40
Inventor 张大伟丁留谦权锦王志力马建明吕烨张洪斌喻海军穆杰吴滨滨
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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