Study On The Influence Of Built Environment On Pollutant Dispersion Of Vehicle Exhaust In Typical Areas Of Shenzhen

With the rapid development of the past thirty years,Shenzhen private car ownership has more than 4 million.Motor vehicle exhaust pollution has become the most important source of atmospheric pollution in Shenzhen City,pollution "contribution rate" as high as 70%.Among the factors affecting the diffusion of vehicle exhaust pollutants,a large part of the environment is closely r elated to the built environment.Therefore,the study of the impact of the environment on the diffusion of motor vehicle exhaust gas is very important for the future prediction of vehicle exhaust pollution and urban ecological planning.This study focuses on the two aspects of the built environment and vehicle exhaust pollutant dispersion.The built environment of Shenzhen and the diffusion of vehicle exhaust pollutants in typical area of Shenzhen city were discussed.A method to study the correlation between the built environment and the diffusion of pollutants from motor vehicles is proposed.Finally find out the intrinsic link between the two,the related research contents are as follows.(1)Through the method of literature analysis,this paper finds out the environmental factors which are suitable for this study,and finally select the "5D" elements of the built environment as the built environment variables of this study,and then use ArcGIS software to Shenzhen City,the ten typical areas of the built environment "5D" elements of quantitative analysis.(2)Combined with Baidu map traffic congestion information and Shenzhen transportation pla nning and design center of the relevant research,and with reference to a series of relevant technical specifications,to achieve the ten typical area of Shenzhen city road traffic volume forecast,ADMS simulation of the typical area of Shenzhen City,the vehicle exhaust pollutant dispersion situation,to obtain the correspond ing concentration of pollutants.(3)By using the correlation analysis of the geographical mathematics method,the model of "5D" and the concentration of pollutants in vehicle exhaust in ten typical areas of Shenzhen city were built,calculate the correlation between the variables,and analyze the correlation between them.Study found,the larger the population density of the area,the greater the concentration of NOX and VOC,the greater the chance of Nitrogen Oxides Pollution and photochemical reaction.The larger the density of the intersection area,the greater the concentration of NOX and PM2.5,the greater the probability of occurrence of Nitrogen Oxides Pollution and haze phenomen on.The larger the density of the bus station area,the greater the concentration of NO X,the greater the probability of occurrence of Nitrogen Oxides Pollution.Therefore,in order to avoid serious motor vehicle exhaust pollution phenomenon should be appr opriate to control the density of population,intersection density and the density of the bus station.