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

A technology for sudden pollution accidents and pollution fields, which is used in computing, instrumentation, electrical digital data processing, etc.

Active Publication Date: 2012-09-12
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Judging from the above characteristics, most of the current water quality models, software, and visualization platforms have not carried out special calculation methods and software platforms for the special problem of water environment emergency decision-making.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

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 conversion, model calculation and output of results Etc., see the flowchart involved figure 1 In the following, the impact of xylene pollution in the Baguazhou area of ​​Nanjing on the Nanjing River and the lower reaches of the Yangtze River is taken as an example to illustrate the technical solution of the present invention.

[0084] Assume that the toluene leakage accident in the tank farm of Nanjing Longxiang Liquid Chemical Terminal Storage Co., Ltd., the latitude and longitude of the accident location: 118.81 32.24, the characteristics of the discharged material: 60t toluene, instantaneous discharge

[0085] Take t...

Embodiment 2

[0132] Embodiment 2. The main calculation methods and steps of the zero-dimensional model

[0133] For situations that require rapid estimation and lack of boundary condition data such as terrain, water level, and flow, you can consider using a zero-dimensional model for rapid calculation. The model uses continuous and instantaneous point source formulas to calculate.

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

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

[0136] ∂ c ∂ t + U ∂ c ∂ x 1 = D 11 ∂ 2 c ∂ x 1 2 + D twenty two ∂ 2 c ∂ x 2 2 - - - ( 3 - 1 )

[0137] The solution of this equation is: c ( x 1 , x 2 , t ) = M 4 π D 11 D twenty two exp [ - ( x 1 - U t ) 2 4 D 11 t - x 2 2 4 D twenty two t ] - - -...

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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, rivers, and estuaries not only have an important impact on the landscape ecology of the region, but also on the biological community in the water body and drinking water safety. When a pollution accident occurs, it is necessary to quickly calculate the impact of various factors Download the dynamic distribution of the pollutant concentration field and visually display it, and then use certain engineering and other measures to determine an effective way to reduce pollution losses based on the dynamic changes of the pollution field and the physical and chemical characteristics of the pollutants. At present, my country’s water pollution accidents are increasingly frequent, but the water environment risk early warning and e...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 黄国鲜陈求稳马金锋吴文强李伟峰
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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