Complicated river channel gridding method used for simulation of river channel hydrological numerical value

Abstract

The invention relates to a complicated river channel gridding method used for simulation of a river channel hydrological numerical value. Various complicated river channel regions with tributary exit conflux, tributary entrance conflux and a central bar and the like are freely segmented into simple region sets; and according to a river channel numerical value simulation demand, a region control curve grid spacing is arranged, so that a two-dimensional grid is generated; and simple region grids are merged so as to obtain an initial grid of the complicated river channel after subdivision. For a specific region of a river channel water front, the region mesh point density can be increased flexibly according to demands, so that grid encryption division in the region can be realized. According to the invention, a Laplace equation is solved and convergence precision is set; initial grid orthogonalization can be realized, so that a river channel two-dimensional orthogonal grid is finally obtained. Moreover, the conception of the method is ingenious and adaptability is good; gridding processing can be carried out on a complicated river channel containing a central bar; and designated grid encryption can be carried out in practice according to demands.

Description

technical field [0001] The invention relates to a complex river channel gridding method for river channel hydrological numerical simulation, and belongs to the grid generation technology in fluid mechanics and the spatial data interpolation technology field in geographic information system (GIS). Background technique [0002] Numerical simulation of river channels integrates computer science, fluid mechanics, mathematical theory of partial differential equations, computational geometry, numerical analysis and other disciplines. In addition to relying on the development of these disciplines, its development is more directly reflected in the two-dimensional grid of river channel plane simulation. Build technology dependencies. When applying methods such as finite difference method and finite volume method to numerically solve the numerical simulation of river channel, it is necessary to generate corresponding calculation grids, and the quality of the generated grids directly a...

AI Technical Summary

Problems solved by technology

[0005] The main problems of the channel Thompson method are: (1) In the case of complex continents, shoals and shorelines, river banks, unsteady flow banks and moving boundaries caused by numerical solutions, the fitting between the grid and the channel bank is the same. There will be actual deviation; (2) For the common wide and narrow channel planar forms, the numerical calculation accuracy problems may be caused by the uneven spacing of the two-dimensional grid; although the elliptical grid generation method ensures the grid line and boundary Orthogonality, but the density of the grid cannot be well controlled; the algebraic method does not adjust the density of the grid in the irregular area

The existing automatic grid subdivision algorithms and software at home and abroad lack the flexibility to control the grid size and node density according to the complex river terrain changes

Images