Calculating method for dynamic pollution field of open water body emergent pollution accident

Abstract

The invention discloses a calculating method for dynamic pollution field of open water body emergent pollution accident. The method provided in the invention comprises the following steps: 1) determining area coverage the model calculates according to the position of a pollution source and basic flow field characteristics of the open water body; 2) respectively obtaining data 1, data 2, data 3, data 4 and data 5; 3) respectively inputting the data 1-5 into a software and respectively generating a corresponding data file. The experiments prove that: by applying the above technical scheme, the calculating method has advantages of using structureless trilateral and quadrilateral grids to solve for a two-dimensional or three-dimensional model and being suitable to any region's mesh dissection and solution.

Description

technical field

[0001] The invention relates to a numerical modeling method, in particular to a method for calculating a dynamic pollution field of an open water body sudden pollution event. Background technique

[0002] The water environment of reservoirs, lakes, river courses and estuaries not only has an important impact on the regional landscape ecology, but also has an important impact on the biological communities in the water body, drinking water safety, etc. When a pollution accident occurs, it is necessary to quickly calculate the impact of various factors Under the dynamic distribution of the pollutant concentration field, and visually display, and then according to the dynamic changes of the pollution field and the physical and chemical characteristics of the pollutants, certain engineering and other measures are used to determine effective ways to reduce pollution losses. At present, my country's water pollution accidents are becoming more and more frequent, but ...

Examples

Embodiment 1

[0082] Embodiment 1, two-dimensional model detection

[0083] The implementation of the system mainly involves the selection of the research area and grid generation, terrain interpolation, model calculation period and step size determination, boundary conditions, input of initial conditions, determination of characteristic parameters of leaked pollutants, coordinate transformation, model calculation and its result output etc. For the flow chart involved, see figure 1 , the technical solution of the present invention will be described below by taking the impact of xylene pollution in the Baguazhou area of ​​Nanjing on the Nanjing River and the lower reaches of the Yangtze River as an example.

[0084] Assume that there is a toluene leakage accident in the tank area of ​​Nanjing Longxiang Liquid Chemical Terminal Storage Co., Ltd. The latitude and longitude of the place where the accident occurred is: 118.81 32.24, and the characteristics of the emission material: 60t of tolue...

Embodiment 2

[0132] Embodiment 2, the main calculation method and steps of the zero-dimensional model

[0133] For situations where fast estimation is required and boundary condition data such as terrain, water level, and flow are lacking, a zero-dimensional model can be considered for fast calculation. The model is calculated using continuous and instantaneous point source formulations.

[0134] (1) The main principle of the model:

[0135] The equation of the instantaneous source two-dimensional diffusion model is:

[0136] ∂ c ∂ t + U ∂ c ∂ x 1 = D 11 ∂ 2 c ∂ x ...

technical field

[0001] The invention relates to a numerical modeling method, in particular to a method for calculating a dynamic pollution field of an open water body sudden pollution event. Background technique

[0002] The water environment of reservoirs, lakes, river courses and estuaries not only has an important impact on the regional landscape ecology, but also has an important impact on the biological communities in the water body, drinking water safety, etc. When a pollution accident occurs, it is necessary to quickly calculate the impact of various factors Under the dynamic distribution of the pollutant concentration field, and visually display, and then according to the dynamic changes of the pollution field and the physical and chemical characteristics of the pollutants, certain engineering and other measures are used to determine effective ways to reduce pollution losses. At present, my country's water pollution accidents are becoming more and more frequent, but ...

Examples

Embodiment 1

[0082] Embodiment 1, two-dimensional model detection

[0083] The implementation of the system mainly involves the selection of the research area and grid generation, terrain interpolation, model calculation period and step size determination, boundary conditions, input of initial conditions, determination of characteristic parameters of leaked pollutants, coordinate transformation, model calculation and its result output etc. For the flow chart involved, see figure 1 , the technical solution of the present invention will be described below by taking the impact of xylene pollution in the Baguazhou area of ​​Nanjing on the Nanjing River and the lower reaches of the Yangtze River as an example.

[0084] Assume that there is a toluene leakage accident in the tank area of ​​Nanjing Longxiang Liquid Chemical Terminal Storage Co., Ltd. The latitude and longitude of the place where the accident occurred is: 118.81 32.24, and the characteristics of the emission material: 60t of tolue...

Embodiment 2

[0132] Embodiment 2, the main calculation method and steps of the zero-dimensional model

[0133] For situations where fast estimation is required and boundary condition data such as terrain, water level, and flow are lacking, a zero-dimensional model can be considered for fast calculation. The model is calculated using continuous and instantaneous point source formulations.

[0134] (1) The main principle of the model:

[0135] The equation of the instantaneous source two-dimensional diffusion model is:

[0136] ∂ c ∂ t + U ∂ c ∂ x 1 = D 11 ∂ 2 c ∂ x ...

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