湍流动能闭合方法在中尺度模式中的应用

湍流动能闭合方法是近年来发展起来的用以模拟大气边界层的一种方法，本文对其做了简化，仅在边界层内使用这一方法，进一步减少计算量，使之更适用于中尺度数值模拟。对一维旺加拉（Wangara）资料进行的试验表明，这种方法保留了边界层计算的精度，又能节省机时。然后将这种方法应用于三维中尺度钟形山地形的模拟，描述了湍流动能的分布，以及湍流活动对山后回流区面积和强度的影响。

The Application of Turbulent Kinetic Energy Closure Scheme on Mesoscale Model

Turbulent kinetic energy (TKE) closure scheme was developed to simulate atmospheric boundary layer (ABL) in recent years In this paper, TKE closure scheme was simplified to be used only in ABL Thus it became more suitable to be used in mesoscale numerical simulation because of the less computation A one-dimensional model verified by Wangara observed data showed that the method of simplification not only kept the precision of simulation in ABL but reduced the computer time The method was applied to three-dimensional mesoscale simulation of airflow over bell-shape terrain The distribution of turbulent kinetic energy was successful to display, and it was discussed that activity of turbulence affected the intensity and area of lee zone