中文摘要：

以往对山地风加速效应的研究及发达国家最新规范中关于山地风加速效应的计算模型往往采用指数律模型,并且只考虑了较缓的山坡,各模型中系数取值差异较大.针对这一问题,文中基于计算流体力学软件Fluent 6.2平台,利用数值模拟方法对不同坡度、高度和地貌情况下的山地风加速效应进行计算,分析了山体坡度、山体高度及地貌对山地风加速效应的影响,根据数值模拟结果提出了山地平均风加速效应的对数律计算模型,拟合了模型中各参数的取值,把适用范围扩大到了较陡的山坡,并将文中模型计算结果与现有模型及规范计算结果进行比较,结果表明,对数律计算模型比指数律计算模型能更精确地描述山地近地风的加速效应.

英文摘要：

In early researches and the latest specifications of some developed countries,the exponential-law calculation models are often used to calculate the speedup effect of wind velocity at the tops of moderate hills and crests,and the parameters of different models are variable.In order to solve this problem,the influences of the slope and the height of a hill as well as the terrain conditions on the speedup effect are numerically simulated with the CFD software Fluent 6.2.According to the simulated results,a logarithmic-law calculation model of average speedup effect is proposed based on the fitting of all parameter values,which is available for steeper hills and crests.From the comparison of the proposed model and the previous model as well as the existing specifications,it is found that the proposed logarithmic-law model is more accurate than the exponential-law one in terms of the description of speedup effect of near-surface wind velocity in hilly terrain.