深凹地形边界层风场与湍流场结构及扩散规律的数值研究

建立了一个模拟小尺度复杂地形边界层平均流场和湍流场结构分布特征的三维非静力细网格高阶矩湍流闭合模式，并将此模式与一个拉格朗日粒子随机游动大气扩散数值模式相联结，以边界层气象模式的输出作为扩散模式的输入，构成了一个大气扩和模拟系统，成功地模拟了某地实际深凹露天矿区和理想凹坑地形两种情况下的平均流场、雷诺应力和湍流通量场，分析了其分布特征，并模拟了矿坑内污染物的散布规律

The Numerical Study On Structures of PBL Wind and Turbulence Fields and Pattern of Diffusion on Deeply-concave Terrain

In this paper, a three-dimensional planetary boundary layer (PBL) numerical model for simulating the distributions of structures of mean wind and turbulence fields on complex terrain was established. The model adopted high-order moment closure scheme. The nonhydrostatic principle was employed and fine-mesh was used for high spatial resolution. An atmospheric diffusion simulation system was developed, which consists of the PBL model and a lagrangian particle random walk atmospheric diffusion model whose input was output of the PBL model. The mean wind, Reynolds stress, and turbulence flux fields have been successfully simulated under two circumstances which were in a real deeply-concave open pit mine and an ideal deeply-concave pit, and their distribution characteristics were analysed. The spread pattern of pollutants in the pit was also simulated.