中文摘要：

运用数值方法对城市中高架点源排放大气污染物的扩散规律进行了模拟研究，在计算区域内建立了三维数学模型，并将拉格朗日法描述的颗粒轨道模型耦合到风场。本研究计算了地面风速为3m／s时的大气流场，并模拟研究了该风场条件下气体污染物的扩散和固体颗粒污染物的运动轨迹。通过分析模拟结果，给出了高架点源中排放的气体污染物的扩散区域和固体颗粒污染物运动轨迹的变化规律。

英文摘要：

Diffusion law of air pollutants emitted from high chimney emission sources was simulated by using numerical methods, three-dimensional mathematical model was built in research area. particle trajectory model that lagrangian method described coupled to wind field. In this paper atmospheric flow field was calculated when the surface wind speed was 3 m/s,under the condition of this wind flow, gaseous pollutant diffusion and motion trajectory of particle pollutants were studied. Through analyzing the results of simulation, the change law was obtained about diffusion region of gaseous pollutant diffusion and motion trajectory of particle pollutants.