Numerical number simulation method of complex river network shunting

Abstract

The invention relates to the technical field of complex river network flow field numerical simulation, and discloses a complex river network shunting numerical simulation method. The method comprises the steps that by means of a two-dimensional non-constant shallow water equation set, a quadrilateral mesh and triangular mesh hybrid network system is built, and a finite volume method is used for performing dispersion, so that a planar two-dimensional numerical model of a complex river network is built, and actual water flow motion features in the river network are simulated; by means of measured data rate, a simulated result is determined, and related parameters of the model are determined; then, shunting nonuniform coefficient measuring flow distributed features are introduced, and shunting nonuniform coefficients of a plurality of shunting joints in the river netework are calculated. In this way, the problems that spatial limits of a one-dimensional model are caused and the three-dimensional model calculation time cost is excessively large are avoided, and the defect that the mass and momentum partial non-conservation phenomenon of a multi-dimensional coupling model in linkage appears is overcome.

Description

technical field [0001] The invention relates to the technical field of numerical simulation of complex river network flow field, in particular to the numerical simulation of flow distribution of complex river network with multiple branches. Background technique [0002] Many large rivers around the world, such as the Nile, the Mekong, the Mississippi, and the Pearl River, often branch into the downstream estuaries and develop into complex river networks. These river networks are composed of many branched channels and mouths. The movement of water flow in a certain branch has an impact on the whole river network. Because the river network is mostly located in the estuary area, it is not only affected by the upstream runoff, but also affected by the tide of the open sea, which makes the dynamics in the river network very complicated. [0003] The flow distribution of branched channels has always been a classic problem in the study of river dynamics. It is related to the dist...

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Problems solved by technology

[0005] The numerical simulation method of complex river network diversion provided by the present invention aims to establish a plane two-dimensional numerical model of the river network under the joint action of runoff and tide, and introduces the uneven coefficient of diversion to describe the inhomogeneity of river network flow distribution, so as to overcome Insufficiency of current research on complex river network diversion

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