山区复杂地形上区域大气质量模式的试验研究

EXPERIMENTAL STUDY OF REGIONAL AIR QUALITY MODEL OVER COMPLEX MOUNTAIN-VALLEY TERRAIN

由于复杂地形上的气流多变，所以，进行区域空气质量模拟是比较困难的。根据大气污染总量控制和环境规划的需要，发展了一种可适用于山谷城市的大气质量模式。该模式的主要特点：（１）采用目前应用尚少的复杂地形上的三维边界层模式作为大气扩散模式所需的三维边界层要素场；（２）用复杂地形上的三维平流扩散模式和高斯扩散模式分别模拟低架源（包括面源）和高架源所造成的地面ＳＯ２浓度，然后将两者的模拟浓度在相应网格上叠加。验证结果表明，该混合模式可以较好地模拟山区复杂地形上的大气污染物浓度。

Simulation of regional air quality over complex terrain is difficult because of the changeable flow With the need of total air pollution control and environmental programing, an air quality model which is suitable to mountain-valley city is developed in this essay:(1) a three-dimensional boundary-layer model over complex terrain is used for offering the boundary-layer meteorological elements which are need for the diffusion model (2) The three-dimensional advcution diffusion model and Gauss model over complex terrain are respectively used to simulate the surface SO 2 concentrations that are made by low sources(including area sources) and elevated point sources, two of the simulated concentrations are added on the corresponding grids The verification of the model indicates that the simulated results are well compatible with the available observations So this model can be used in the work of regional air quality control and management over complex terrain