高斯气体扩散模型下的北京市机动车尾气污染模拟

参照北京市主要干道车流量、中国统计年鉴所登记的北京市车型分布数据、油品使用以及气候数据,利用 Mobile6.2模型修正参数,得出北京市机动车尾气综合排放因子;利用上述数据结合高斯线源扩散模型借助 Matlab 编程计算,实现空间位置与浓度分布的结合。根据所得到的浓度图,可以看出,浓度分布于环路的位置有所重叠,并且集中分布在环路的1.5 km 范围内,以 SO 2为例,其环路1.5 km 范围的平均浓度值超出了大气二级质量标准上限值100倍,同时依据模型计算数据与真实观测点数据进行比较,发现误差控制在20%以内,模型表现良好。

A Simulation of Vehicle Emissions in Beijing Using Gauss Gas-diffusion Model

This paper develops a set of comprehensive factors for modeling vehicle emissions in Beijing,by using a calibrated of Mobile6.2 model in conjunction with the observed traffic volumes,the vehicle registration data from the Chi-na Statistical Yearbooks,the consumption of gas fuel and climate data of Beijing.Based on a Gauss diffusion formulation and a Matlab program,this paper develops presents the relationship between spatial distribution of vehicles and emission concentration under different conditions.The concentration maps show that the exhaust pollution is concentrated in the range of the area within 1.5 km around the ring roads;the average emission concentration is 100 times higher than the limits from the Air Quality Standard Grade 2 when taking SO 2 as an example.A comparison between the results from the model and the observed data is conducted and it is found that the relative deviation is less than 20%.