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Two-dimensional structural mesh generation method for branchless river based on topographic feature boundaries

A technology of terrain characteristics and two-dimensional structure, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of controlling the longitudinal trend of the river, inability, and inconvenient operation

Active Publication Date: 2018-12-28
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In most cases, the measure to be taken is to manually divide the area to be subdivided. When the river channel is long and the terrain is complex, the number of artificial divisions is generally large, and the operation is extremely inconvenient, time-consuming and laborious; The grid density distribution is greatly affected by human factors, has obvious individual differences, is not self-adaptive, and cannot better control the longitudinal trend of the river and reflect the lateral variability of the terrain. In-depth study of the segmentation method

Method used

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  • Two-dimensional structural mesh generation method for branchless river based on topographic feature boundaries
  • Two-dimensional structural mesh generation method for branchless river based on topographic feature boundaries
  • Two-dimensional structural mesh generation method for branchless river based on topographic feature boundaries

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Embodiment 1

[0047] In this embodiment, a method for subdividing a two-dimensional structure grid of a branchless river channel based on the terrain feature boundary is described in detail, and the steps are as follows:

[0048] (1) Obtain basic data

[0049] Select the unbranched target river section that needs to be divided into two-dimensional structural grids. The distribution of the characteristic longitudinal control line, initial cross-section and end cross-section of the target river section is as follows: figure 1 shown.

[0050] Obtain the terrain data of the characteristic longitudinal control lines of the target river section through satellite images. Specifically, import a high-definition satellite image into CAD software to draw the river channel boundary line and the trough-shoal boundary line to obtain 4 characteristic longitudinal control lines, and The plane coordinate data of several control points on these four longitudinal control lines will be located between the lef...

Embodiment 2

[0068] In this embodiment, an example is used to illustrate the extended application of the two-dimensional structured grid obtained by using this method.

[0069] By means of computer programming (such as Fortran, Matlab, etc.), the grid data obtained by the subdivision of Embodiment 1 is integrated according to the readable text format or batch drawing command sequence of software such as Mike, SMS, Auto-CAD, etc., to realize the perfect data exchange channel Build, give full play to the unique advantages of each software to perform multi-form visualization and deep-level reuse of the two-dimensional structure grid of unbranched rivers obtained by subdivision.

[0070] (1)Mike

[0071] Mike is a water flow simulation component developed by Danish DHI company, which integrates Mike11 and Mike21, which are widely used at present. Mike21 is suitable for the scale demonstration and analysis of watershed control engineering at the macro level, the research of watershed flood reg...

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Abstract

The invention belongs to the technical field of river numerical simulation, and provides a two-dimensional structural mesh generation method of branchless river based on topographic characteristic boundary, comprising the following three steps: (1) acquiring basic data; (2) preliminary generation of two-dimensional structural mesh of a target river section; and (3) carrying out lateral refinementon the preliminary generation result. The method combines the river boundary line, the characteristic topographic boundaries, such as deep-water line, beach-trough line and water boundary line, are integrated into the two-dimensional structural mesh generation process of the river channel region. The method can make the meshes adapt to the change of river boundary, and control the longitudinal trend of river and reflect the transverse deformation rate of terrain. The method is simple and convenient to operate, and can solve the problem that the mesh density distribution obtained by artificialpartition is greatly influenced by human factors and has obvious individual difference.

Description

technical field [0001] The invention belongs to the technical field of river numerical simulation, and relates to a method for subdividing a two-dimensional structure grid of a branchless river course based on terrain feature boundaries. Background technique [0002] The two-dimensional structural grid is also commonly referred to as a quadrilateral grid. The spacing between adjacent nodes in the grid area is generally not equal, but the topological relationship is clear, and all internal nodes have the same number of adjacent units. Due to its fast generation speed, simple data structure, low storage memory usage, and low requirements for computer configuration, structured grids are widely used in two-dimensional water and sand numerical simulations. In the grid subdivision of two-dimensional water-sediment numerical simulation, in order to shorten the calculation time and ensure the credibility of the numerical simulation results, it is usually required that the grids in p...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 潘云文杨克君刘欣刘兴年刘超郭志学
Owner SICHUAN UNIV
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