Correction method for grid outflow rate used for flood routing numerical calculation

A numerical calculation and grid technology, applied in the fields of calculation, electrical digital data processing, special data processing applications, etc., can solve the problem that the numerical calculation of flood evolution cannot be carried out smoothly.

Inactive Publication Date: 2014-01-22
NANJING XIAOZHUANG UNIV
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for correcting the grid outflow rate used in the numerical calculation of flood evolution. This correction method solves the problem that the numerical calculation of flood evolution cannot be carried out smoothly when the water surface elevation is lower than the ground elevation. technical problem

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  • Correction method for grid outflow rate used for flood routing numerical calculation
  • Correction method for grid outflow rate used for flood routing numerical calculation

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Embodiment Construction

[0036] Embodiments and examples of the present invention will be described in detail with reference to the drawings.

[0037] figure 1 Show the flow chart of the correction method of the grid outflow rate that is used for the numerical calculation of flood evolution of the present invention, now in conjunction with figure 1 Each step of the correction method is described in detail in the flow chart.

[0038] in step S In 001, a digital elevation model of the terrain in the calculation domain is established, and its specific implementation method includes: obtaining a remote sensing image of a high-inundation area, and establishing a digital elevation model of the high-inundation area in the calculation domain through the remote sensing image.

[0039] The method for establishing described digital elevation model comprises:

[0040] The calculation domain is according to a certain space step size ( , ) to obtain a two-dimensional regular grid model, define ( i , j ) ...

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Abstract

The invention relates to a correction method for the grid outflow rate used for flood routing numerical calculation. The method comprises the steps of correcting negative water depth grids through correction factors so as obtain the actual water depth of the grid. The method solves the technical problems that in the traditional moving boundary calculation, the condition that the water surface elevation is lower than the ground level often occurs, namely, calculated water depth becomes negative value, and a negative water depth grid appears, consequently, the constancy of the mass in a calculation domain can not be ensured, stability becomes poor, even calculation is scattered and a result can not be obtained, and the flood routing numerical calculation is influenced to be incapable of being conducted smoothly. The correction factor lambda is introduced, so that when the water surface elevation is lower than the ground level, the flood routing numerical simulation calculation has been conducted smoothly.

Description

technical field [0001] The invention relates to a method for correcting grid outflow rate used in numerical calculation of flood evolution. Background technique [0002] Flood disaster refers to the formation of floods with large peak flow in a short period of time under the influence of heavy rainfall in hilly areas. my country is located in the East Asian monsoon region, and mountainous and hilly areas account for two-thirds of the country's land area. Among them, the priority area for flood disaster prevention reached 970,000, affecting 130 million people. In recent years, the death toll caused by flood disasters accounted for more than 70% of the national flood disaster deaths, becoming the main disaster that caused casualties. With the development of social economy, more and more attention has been paid to the prevention and control of flood disasters. [0003] Earlier, the internationally common flood disaster prediction technology was to conduct field sampling of d...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCY02A10/40
Inventor 张家华
Owner NANJING XIAOZHUANG UNIV
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