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A method for establishing a block pollutant concentration distribution model

A technique of pollutant concentration and establishment method, which is applied in the field of establishment of block pollutant concentration distribution model to achieve the effect of improving calculation efficiency, speeding up calculation process and reducing workload

Active Publication Date: 2017-06-09
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For this reason, the technical problem to be solved by the present invention is to simplify the calculation process of the wind field in the block pollutant concentration distribution model, improve the calculation efficiency of the block pollutant concentration distribution model, and thus propose a method for establishing a block pollutant concentration distribution model

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  • A method for establishing a block pollutant concentration distribution model
  • A method for establishing a block pollutant concentration distribution model
  • A method for establishing a block pollutant concentration distribution model

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Embodiment 1

[0046] This embodiment provides a method for establishing a block pollutant concentration distribution model, figure 2 The overall frame diagram of the establishment of the pollutant concentration distribution model in the block shown, image 3 The flow chart of the establishment method of the block pollutant concentration distribution model shown mainly includes the following steps:

[0047] S1: Taking the wind at different locations inside the street as the dependent variable, and taking different terrains and different background winds as independent variables, establish a multiple linear regression equation:

[0048]

[0049] The meanings of the above parameters are: u is the wind speed; H 1 、H 2 、H 3 、H 4 is the height or width or length of the block to be analyzed, and H 1 ≠H 2 , H 3 ≠H 4 ;V x and V y is the component of the background wind parallel to the street direction or the component of the background wind perpendicular to the street direction, and V x...

Embodiment 2

[0075] This embodiment provides a method for establishing a multi-block pollutant concentration distribution model. The final result of the model provided in Embodiment 1 is a pollutant transfer model suitable for a single block. In order to realize the simulation of pollutant transport in multiple blocks, the overall model sets and processes three open faces of a single block, that is, the three faces where the puff chain extension calculation of the Gaussian puff model stops. The processing process is as follows:

[0076] Record the position (x, y, z) of the last puff on the puff chain calculated by the Gaussian puff model of any block in the multi-block;

[0077] Analysis and judgment:

[0078] If (x, y, z) is located on the top surface of any one of the blocks above, then the concentration distribution is calculated for the whole area based on the Gaussian plume model;

[0079] If (x, y, z) is located on the two sides of any of the blocks above, the puff can be regarded a...

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Abstract

The invention provides a method for building a street pollutant concentration distribution model. A CFD model is utilized for obtaining a wind field matrix, on the basis of the wind field matrix, a wind field multiple linear regression equation in a street can be built, a wind field in the street can be calculated, pollutant concentration distribution in the street can be obtained based on a Gaussian puff model and a GPU parallel technology, and pollutant concentration distribution outside the street can be obtained based on a Gaussian plume model and background wind. According to the method, the calculation process of the wind field can be simplified and quickened, and the calculation efficiency of pollutant concentrations inside and outside the street can be improved.

Description

technical field [0001] The invention relates to the field of environmental science, in particular to a method for establishing a block pollutant concentration distribution model. Background technique [0002] At present, road traffic has become one of the main sources of pollution in modern cities. Vehicle exhaust contains various pollutants such as solid suspended particles, carbon monoxide, nitrogen oxides, and hydrocarbons. The canyon-like terrain formed by buildings and streets leads to street canals. Special air flow phenomena such as wind and road wind, one of the results of this air flow phenomenon is, such as figure 1 As shown, when the background wind blows vertically into the building, a vortex will be formed, and the pollutants emitted by the traffic source will be transported with the vortex and accumulate on the leeward side of the bottom, resulting in a higher concentration of pollutants on the leeward side than on the windward side distribution characteristic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 刘峻峰黄欣陶玮孟靖陈卓
Owner PEKING UNIV
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