微观街区交通雾霾污染物扩散模拟——以北京市为例

Simulation of Traffic Haze Diffusion in a Micro Block: A Case Study of Beijing

交通尾气是北京市的主要雾霾污染来源。针对遥感数据对雾霾污染物的研究存在的非立体、非微观、非单源等不足,采用虚拟实验和模拟的思想,从街区这一微观角度对交通尾气扩散的时空分布规律进行研究。模拟结果表明:第一,水平分布上,交通尾气随着距道路长度的增加而降低,距道路100m范围内的交通尾气质量占比达到90%以上;第二,垂直分布上,交通尾气随距离地面的高度增加而降低,0-10米区间是尾气污染物质量占比最大的高度区间,尾气污染物主要集中在[0,50]米的高度区间。

Traffic exhaust is the major source of haze pollution in Beijing. Traditional researches on haze pollution using remote sensing data mainly focused on 2-dimensional, non-microscopic, and multi-sources.Therefore, the project aims to study the 3-dimensional spatial distributions of traffic exhaust in a micro-scopic street by simulation. The results show that First the horizontal distribution. The density of the traf-fic exhaust decreases with the increase of the distance from the road. The mass proportion within 100 m from the road is more than 90%.Second the vertical distribution. The density of the traffic exhaust decreases with the increase of the height. 0 m to 10 m hold the largest proportion against other ranges, and the exhaust concen-trated mainly from 0 m to 50 m.