Two-dimensional mesoscopic numerical value simulation method of water age of surface water

A numerical simulation and surface water technology, applied in general water supply conservation, electrical digital data processing, special data processing applications, etc., can solve the problems of Lagrangian method, such as large amount of calculation, complex program form, and inability to calculate water age , to achieve the effect of promoting development, reducing the amount of calculation, and increasing feasibility

Inactive Publication Date: 2016-07-27
BEIJING NORMAL UNIVERSITY
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Problems solved by technology

In previous studies, there are many difficulties in realizing the calculation of Lagrangian method. The biggest obstacle is that the Lagrange method requires a large amount of calculation. Therefore, the Euler method is usually used to calculate the water age, but t...

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  • Two-dimensional mesoscopic numerical value simulation method of water age of surface water
  • Two-dimensional mesoscopic numerical value simulation method of water age of surface water

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Embodiment 1

[0018] Such as figure 1 As shown, the present invention discloses a two-dimensional mesoscopic numerical simulation method of surface water age, and the simulation method includes the following specific steps:

[0019] Collect the background information of the research area and establish the prototype of the model: collect the topographic data, hydrological data, water quality data, meteorological data and pollutant parameters of the research area, and use the above data to establish a preliminary model;

[0020] Construct the lattice Boltzmann model for solving the two-dimensional shallow water equation: further, by setting the outflow and inflow boundaries and initial conditions, use the lattice Boltzmann equation of the two-dimensional shallow water equation with the BGK collision operator to establish the lattice Boltzmann hydrodynamic model: where f α is the particle distribution function, f eq is the local equilibrium distribution function, F i is the external force ...

Embodiment 2

[0025] Experiment purpose and method: In order to verify the feasibility and effectiveness of this application, this embodiment further illustrates the present invention with the largest freshwater lake Baiyangdian Lake in the North China Plain as an implementation case, using the method described in Example 1, wherein the relevant hydrological data, water quality Data, meteorological data, and pollutant parameters are all from official data, while terrain data is supplemented by multi-beam sonar measurement. The Baiyangdian Lake was simulated using the water age model to obtain the water age distribution map at the 33rd day ( figure 2 ).

[0026] Experimental results: if figure 2 The entrance of Baiyangdian Lake shown is at the bottom of the figure, and the exit is at the top. It can be seen from the figure that the value of water age shows a gradual upward trend from the inlet to the outlet. The maximum value of water age appears in the lower right corner of the study a...

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Abstract

The invention relates to the field of water environment simulation, and discloses a two-dimensional mesoscopic numerical value simulation method of the water age of surface water. A lattice Boltzmann method is combined with a concept of the water age, the water age can be calculated from the essence of particle movement, and therefore, a model can more accurately and efficiently simulate water quality. A hydrodynamic force-water age model is applied to the Danjiangkou reservoir, so that the water quality variation trend of the Danjiangkou reservoir can be predicted, a relocation diffusion rule of pollutant in a water body can be obtained, an area where eutrophication may happen can be predicted, and a scientific basis is provided for reservoir management; through the cross fusion of the lattice Boltzmann method and water age calculation, two water age simulation methods, i.e., an Eulerian method and a Lagrange method, on the basis of the lattice Boltzmann method are developed; a calculated amount generated when the Lagrange method is used for calculating the water age is lowered, the feasibility of the method is increased, and meanwhile, the development of the lattice Boltzmann method in the field of water quality models can be accelerated; and the lattice Boltzmann method is applied to the calculation of the water age of the Danjiangkou reservoir and is further tightly combined with practical research.

Description

technical field [0001] The invention relates to the field of water environment simulation, in particular to a two-dimensional mesoscopic numerical simulation method of surface water age. Background technique [0002] Today, many surface water bodies have been polluted by pollutants and affected by human activities, and the water quality has deteriorated. This phenomenon may directly lead to ecological degradation and eutrophication. A large number of studies have shown that, in addition to the types of pollutants and the entry of pollutants In addition to the volume of water bodies, the residence time of pollutants in water bodies is an important parameter to control algal blooms and eutrophication. In order to better realize ecological restoration and environmental management, it is necessary to quantify the residence time of water or pollutant particles in water bodies. In the research, parameters such as water exchange period or hydraulic retention time are usually used ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/367Y02A20/152
Inventor 刘海飞丁禹
Owner BEIJING NORMAL UNIVERSITY
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