河西走廊下垫面粗糙度实测值与模拟值的差异性分析

利用甘肃省河西地区17个风塔观测资料和风向风速标准差法,计算了风塔处的下垫面粗糙度,并与中尺度数值模式ARPS中使用的粗糙度参数进行了比较分析。结果表明,数值模式中使用的粗糙度值和实况具有一定差异,其使用的粗糙度定义方案并不能准确地反映出下垫面粗糙度和非均一性特征。差异最大出现在草原下垫面上,可达375%,且差异程度随下垫面植被复杂程度增加。

Variance Analysis on the Simulated and Observed Values of Underlaying Surface Roughness in Gansu Corridor

The data from 17 wind towers in Gansu corridor have been utilized to calculate the underlying surface roughness near these wind towers,which have been compared with the roughness used in meso-scale numerical models. The results show that there are some differences between both of them,and the definition in the models can not accurately reflect the roughness and nonuniformity of real underlying surface. The difference between them increases with the vegetation complex degree of underlying surface,and peaks i...