Monte-Carlo 法模拟复杂地形对扩散的影响

不考虑边界层中层结作用，引入Kao得到的复杂地形中的平均流场分布和近十年来PBL实验和理论研究导出的新的湍流统计量参数化关系，本文用Monte-Carlo模式模拟了复杂地形对扩散的影响，结果表明:地形的影响主要是迎风坡抬升和背风坡下沉；陡峭地形和平缓地形的影响不完全相同；在陡峭地形和大的平缓地形的背风坡能够形成空腔区，空腔区内出现闭合的浓度中心，且地形越陡峭，闭合浓度中心的范围越大；大地形对扩散的影响可以掩盖其下风方小地形的影响。

Monte-Carlo Model Simulates the Influence of Complex Terrain on Diffusion

Not considering the stratification, using the mean flow pattern over complex terrain obtained byKao and the turbulence statistics parameterization derived from the experiment and theory in the PBL,the innuence of complex terrain on diffusion is simulated with a Monte-carlo model in this paper.Theresults are:the main influence of terrain is lifting and sinking motion over the windward side andleeward side of the terrain,respectively;the abrupt the terrain,the larger the closed concentrationcenter, the influence of a larger terrain may override that of a smaller one.