汽车排放污染物浓度的预测

为了预测汽车排放污染物的浓度，应用简化的高斯烟团模式得到静风条件下的线源扩散预测模式。并结合高斯烟流扩散模式，建立了预测汽车污染物在任意风向下和年平均浓度的预测模式，考虑车道上存在车辆行驶的强烈机械扰动湍流和把繁忙的公路视为线源两个因素，提出了计算初始扩散参数的方法。然后，运用Turner和Pasquill扩散参数，建立了线源扩散参数的确定方法。该模式应用于预测高速公路沿途汽车污染物的浓度表明，计算值与监测值吻合较好，可用于我国公路环境影响的评价。

Prediction of pollutant concentration from automobile emission

To predict the pollutant concentration from automobile emission, a dispersion prediction model of line source at static wind was yielded from the simplified Gaussian puff model.Combining this prediction model with the Gaussian plume dispersion model, models to predict the pollutant dispersion concentration from automobile emission at any wind direction and the annual average concentration were developed. In this paper, the methods for calculation of the initial dispersion parameters of exhausted gas was put forward in considerations of the strong mechanical turbulent flow along the highway caused by the running vehicle and the busy highway as line source. With Turner and Pasquill dispersion parameters, the methods for calculation of dispersion parameters of line source were also put forward. This model was used to predict the pollutant concentration from automobile emission along express highway, and the calculated value coincide well with the monitored data, it could be used for EIA of highway.