Mesh splicing method for watershed large-scale complex drainage networks

A large-scale, grid technology, applied in the field of fluid mechanics and environmental simulation, which can solve problems such as increased difficulty in grid generation and difficulty in numerical simulation.

Active Publication Date: 2018-04-20
WUHAN UNIV
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Problems solved by technology

The existing regular grid drawing technology and software are limited by computer memory and hardware conditions, and cannot complete the drawing of all grids in large-sca

Method used

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  • Mesh splicing method for watershed large-scale complex drainage networks
  • Mesh splicing method for watershed large-scale complex drainage networks
  • Mesh splicing method for watershed large-scale complex drainage networks

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Embodiment Construction

[0046]The specific implementation of the grid splicing method for the large-scale complex river network in the watershed involved in the present invention will be described in detail below in conjunction with the accompanying drawings.

[0047]

[0048] Such as figure 1 As shown, the grid splicing method of the large-scale complex river network provided in this embodiment includes the following steps:

[0049] Step 1: Basin water system identification, based on DEM remote sensing image data and measured terrain data, extract the water body range and land boundary of the watershed according to the elevation range. Such as figure 2 As shown, it is the main stream of the Yangtze River in the Three Gorges Reservoir area and five main tributaries, Jialing River, Wujiang River, Pengxi River, Daning River and Xiangxi River.

[0050] Step 2: According to the characteristics of the water system in the basin, divide the entire river network into 6 segments, such as figure 2 As sh...

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Abstract

The invention provides a mesh splicing method for watershed large-scale complex drainage networks, and aims at realizing automatic mesh splicing of large-scale watershed complex drainage network areas, decreasing mesh generation difficulty of areas with complex terrains and satisfying nesh construction requirements of the large-scale watershed complex drainage network areas. The method is characterized by comprising the following steps of: 1, recognizing a watershed drainage network water system water system and extracting a watershed water system boundary; 2, separately drawing a trunk streamand branch streams, segmenting a same reach at a position where the watercourse is relatively smooth, independently partitioning the watercourse at intersections of the trunk stream and the branch streams, and keeping superposed areas between every two adjacent watercourses; 3, setting a number and a size of each watercourse mesh according to water system features in watersheds, and respectivelydrawing each watercourse mesh of the trunk stream and the branch streams; 4, dividing T-shaped meshes at intersection areas of the trunk stream and the branch streams into 4 sections to ensure that the mesh number at the intersections is as few as possible; and 6, replacing the original T-shaped meshes by the divided meshes so as to carry out overall mesh splicing.

Description

technical field [0001] The invention belongs to the field of fluid mechanics and environment simulation, and in particular relates to a grid splicing method for a large-scale complex river network in a watershed. technical background [0002] Mesh division is one of the key technologies in computational fluid dynamics. Discretization of structures to obtain finite elements and nodes is a prerequisite for finite element numerical simulation calculations. With the continuous development and improvement of fluid dynamics calculations and hydrodynamic water quality mathematical models based on finite element numerical calculations, the demand for high-precision simulation calculations for large-scale watersheds is also increasing in the research and operational management of environmental problems. The complex flow field has strict requirements on the grid transition, point layout, and quality. The success or failure and efficiency of the entire flow field analysis are closely r...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/18G06F30/23Y02A20/152
Inventor 张万顺夏晶晶王永桂彭虹
Owner WUHAN UNIV
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