应用GIS模拟城市大气污染物浓度分布

从点源大气污染扩散模型出发,借助GIS的栅格与数据库运算功能,结合自已设计的推算流程,对兰州市大气污染物SO2的空间分布情况进行了模拟。经检验,该方法能够较准确的反映出兰州大气污染物的空间分布特征,较应用实测值进行插值的方法简便,具有较好的应用前景。

Using GIS to Simulate Distribution of Ground Concentration of Urban Air Pollution

Based only on air pollutant diffusion models of point source, the traditional simulation methods were merely able to calculate concentration on the special lee site of the source. Their shortage was that they were unable to show concentration distribution on the whole lee place of the source. Although interpolation means based by geo - statistics could show distribution characteristic of the pollutant concentration, it was hard for the way to display the distribution correctly only depending on discharge data of sources, for the method merely related to the distance factor by geo - statistics with abandoning the other factors, such as meteorological and climatic factors etc. In practice, it was nearly impossible to lay enough watch sites to get correct value of spatial interpolated value. Integrated with air pollutant diffusion model of point source and operation function of grid and table of GIS,in the study a special calculating flow was designed to simulate concentration distribution of SO2 in Lanzhou. Compared with the value got from the interpolated means, the value from the study could show characteristic of concentration of air pollutant in Lanzhou more correctly, for it adopted more influent factors. So the study proved that with correct model, GIS could more correctly display concentration distribution of the air pollutant. It was good foreground for GIS to be used in aero - environment.