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研究论文

Numerical simulation of meteorology and pollutant diffusion in urban sub-domain

摘要：建立了一个城市小区尺度模式.该模式为三维非静力高分辨,取kε湍流闭合方案.除考虑空气动力学作用外,引入了作为城市特征的街区建筑物布局及其高度、朝向和对短波辐射的遮蔽以及不同地表利用类型等特征影响,用强迫恢复法计算地面温度,同时加入了污染物平流扩散方程.模式经专门布置的实测资料验证并用其模拟了北京一个小区中的气象条件和污染物扩散特征.结果表明:模式能够较合理地反映由于建筑物遮蔽造成的温度差异以及不同下垫面上的温度变化;能够较好地模拟实际气象条件下的气象要素场特征和不同建筑物布局和土地利用类型的气象要素场特征

Abstract：A city sub-domain scale model has been established, which is a three-dimensional non-hydrostatic model with k-ε closure. In this model the distribution, azimuth and screening of short wave radiation by buildings and underlying surface type as characteristics of urban are considered, the ground temperature is simulated using force-restored method, and the concentration equation is solved simultaneously. The model has been used to simulate the meteorological and pollutant diffusion characteristics in a sub-domain of Beijing, and it is evaluated with especially meteorological and pollutant observational data. It is found that: this model simulates the temperature differences due to different underlying surfaces and screening by buildings reasonably; it models the meteorological field according to the building distribution, underlying surface and meteorological condition very well; the modeled wind field is met with the observational data, while the NO_x concentration is comparable. Finally, the model has been applied to different sub-domains successfully.