Three-dimensional hydrodynamics-water temperature-water quality simulation prediction method of lakes based on splitting algorithm

Abstract

The present invention discloses a lake three-dimensional water power-water temperature-water quality simulation and prediction method based on a splitting algorithm. A lake three-dimensional water power-water temperature-water quality model is constructed, a lake is dispersed into a plurality of grid units, variables are arranged for grids in an Arakawa C mode, each operator in the lake three-dimensional water power-water temperature-water quality model is classified according to wave frequency rapid and slow features of the physical fluctuation process of the operator on the basis of the splitting algorithm, the low-frequency slow process operators are subjected to explicit processing, the high-frequency rapid process operators are subjected to implicit processing, and the model is discretely solved step by step by adopting the splitting algorithm so as to obtain three-dimensional flow fields, water temperatures and water quality index concentrations at different positions in a lake water area and at different time. The lake three-dimensional water power-water temperature-water quality simulation and prediction method based on the splitting algorithm, which is disclosed by the present invention, can more accurately reflect the complex physical processes of momentum migration, heat transfer, pollutant transportation and the like in lake water and has the characteristics of high calculation stability, high calculation accuracy and high calculation efficiency.

Description

technical field [0001] The invention belongs to the technical field of lake water environment numerical simulation, and more specifically relates to a three-dimensional hydrodynamic-water temperature-water quality simulation prediction method of a lake based on a split algorithm. The three-dimensional hydrodynamics-water temperature-water quality simulation prediction method of lakes proposed by the present invention can be used in river and lake connection projects, water diversion dispatching, lake water eutrophication, lake water environment restoration and management, etc., and provides for the management and protection of lake ecological environment. Effective technical means and scientific decision-making analysis. Background technique [0002] As an important carrier of terrestrial water resources, lakes are the key components of the Earth's hydrosphere and the natural support for human survival and sustainable development. However, lakes in my country are currently s...

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Problems solved by technology

[0004] 1. Traditional lake water environment model solution methods usually use a single numerical format to discretely solve the model, resulting in problems such as unsatisfactory stability conditions required for calculation, heavy calculation workload, and low calculation efficiency.

For example, discretization of the model using the pure explicit format may cause divergence of calculation results due to failure to satisfy the CFL stability criterion; while discretization of the model using the pure implicit format ensures the stability of the calculation, but it must be in the entire solution area Solve large-scale nonlinear algebraic equations, resulting in low computational efficiency;

[0005] 2. In practical problems, the mathematical control equations of the model are often simplified to two-dimensional or even one-dimensional. Although reasonable simplification is easy to solve, the natural water body is three-dimensional, and the simplified one- and two-dimensional models cannot truly reflect the water body. The process of change in the vertical, horizontal and vertical directions;

What this patent adopts is the groundwater model, and the physical mechanism of the groundwater model is not suitable for the lake water body studied in the present invention

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