城市街道汽车污染扩散规律模拟研究

如何简单而准确地模拟城市街区污染的扩散规律，对于城市汽车污染控制决策具有重要的意义，从大量实测数据，分析了风速风向等影响街道峡谷污染物扩散的主要因素，采用丹麦开发的街道峡谷模式ＯＳＰＭ，对汽车污染扩散规律进行模拟研究。与北京实测数据对比结果表明，该模式较好地模拟昼间风速风向对街道峡保内汽车污染扩散的影响，比较准确地反映了峡保中流场的主要特征，以及汽车排放污染物的扩散规律，污染物浓度与风速的倒数摈心

A Study on Automotive Pollution Dispersion Modeling in Urban Streets

It is very valuable for decision making of automotive pollution control to simply describe the dispersion of traffic related air pollution in urban streets.In this paper,large amount of monitoring data were used to analyze the effect of wind speed and wind direction on pollutant dispersion inside a street canyon.An urban street canyon dispersion model OSPM initially developed in Denmark,was adopted for the modeling study.Tested by monitoring data,the model is found to be capable of simulating the effects of wind speed and wind direction on dispersion in daytime,showing that the basic pattern of flow and turbulence field in a street canyon is correctly reflected in the model.Pollution concentration is nearly proportional to the reversal of wind speed with form of 1/ u .