Calculation method for dynamic pollution field of sudden pollution events in complex river network

Abstract

The invention discloses a calculating method for dynamic pollution field of complex river network emergent pollution accident. The calculating method provided in the invention comprises the following steps: 1) determining a model to calculate area coverage of the river network according to pollution source positions and a river spatial distribution, dividing river sections and nodes with a software, obtaining a section spatial distribution of the river network; 2) respectively obtaining data 1, data 2, data 3, data 4 and data 5; 3) respectively inputting the data 1-5 obtained in the step 2 to a open water body pollution emergency system with a software number of 2011SR086425, and respectively generating following corresponding data files. The experiments of the calculating method prove that applying the above technical scheme has the following benefits. By applying annular-dendritic mixed river network united solve mode, the one-dimensional river network model developed and applied in the invention can be used in solutions of any river network. And the river network model is characterized by fast and flexible solution.

Description

technical field

[0001] The invention relates to a numerical modeling method, in particular to a calculation method for a dynamic pollution field of a complex river network sudden pollution event. Background technique

[0002] The water environment in complex river network areas not only has an important impact on the regional landscape ecology, but also on the biological communities in the water body, drinking water safety, etc. When a pollution accident occurs, it is necessary to quickly calculate the concentration of pollutants under the influence of various factors The dynamic distribution of the pollution field can be displayed intuitively, and then according to the dynamic changes of the pollution field and the physical and chemical characteristics of the pollutants, certain engineering and other non-engineering measures can be used to determine effective ways to reduce pollution losses. At present, my country's water pollution accidents are becoming more and more frequ...

Examples

Embodiment 1

[0071] Example 1: One-dimensional model detection

[0072] 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 scheme of the present invention will be described below by taking the impact of nitrobenzene pollution in the Nanjing Baguazhou area on the Nanjing River and the lower reaches of the Yangtze River as an example.

[0073] Assume that there is a phenol leakage accident in the tank area of ​​Nanjing Longxiang Liquid Chemical Terminal Storage Co., Ltd. The section where the accident is located is the section numbered 1173 in the one-dimensional river network. . Here we take Changfenghe Road (north of Z...

Embodiment 2

[0128] Embodiment 2, the main calculation method and steps of the zero-dimensional model:

[0129] 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.

[0130] (1) The main principle of the model:

[0131] The equation of the instantaneous source two-dimensional diffusion model is:

[0132] ∂ 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 calculation method for a dynamic pollution field of a complex river network sudden pollution event. Background technique

[0002] The water environment in complex river network areas not only has an important impact on the regional landscape ecology, but also on the biological communities in the water body, drinking water safety, etc. When a pollution accident occurs, it is necessary to quickly calculate the concentration of pollutants under the influence of various factors The dynamic distribution of the pollution field can be displayed intuitively, and then according to the dynamic changes of the pollution field and the physical and chemical characteristics of the pollutants, certain engineering and other non-engineering measures can be used to determine effective ways to reduce pollution losses. At present, my country's water pollution accidents are becoming more and more frequ...

Examples

Embodiment 1

[0071] Example 1: One-dimensional model detection

[0072] 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 scheme of the present invention will be described below by taking the impact of nitrobenzene pollution in the Nanjing Baguazhou area on the Nanjing River and the lower reaches of the Yangtze River as an example.

[0073] Assume that there is a phenol leakage accident in the tank area of ​​Nanjing Longxiang Liquid Chemical Terminal Storage Co., Ltd. The section where the accident is located is the section numbered 1173 in the one-dimensional river network. . Here we take Changfenghe Road (north of Z...

Embodiment 2

[0128] Embodiment 2, the main calculation method and steps of the zero-dimensional model:

[0129] 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.

[0130] (1) The main principle of the model:

[0131] The equation of the instantaneous source two-dimensional diffusion model is:

[0132] ∂ c ∂ t + U ∂ c ∂ x 1 = D 11 ∂ 2 c ∂ x ...

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