风速垂直切变统计分析

STATISTICAL ANALYSIS OF VERTICAL SHEAR OF WIND

由于观测资料垂直分辨率的限制和实际问题的不同需要，存在多种不同的风速垂直切变统计分析方案和差别较大的统计分析结果。文章给出微分切变、投影风速切变、气层平均切变、差分切变的定义；比较了当风随高度变化的函数不同时不同切变的差别；分析了气层厚度、测风平均时距、风速垂直插值方案等对风速垂直切变统计量的影响；最后给出中国及世界风速切变极值统计结果及估算。

wing to the limitation of vertical resolution of observation data and different practical requirements, there are several different schemes and results for statistical analysis of vertical shears of wind. Therefore, how to analyze and use these schemes and results correctly become a very important problem to be solved urgently. This paper analyzed differential shear, mean shear for a layer with determined thickness, difference shear-the vertical shear of mean wind for a layer with determined thickness, and their differences for different functions as altitude. In this paper, effects of layer thickness, measuring mean time of wind, techniques of vertical interpolations of wind on the shears were discussed. The layer thickness depends on practical requirements, so vertical shear of wind is not a pure meteorological element.Besides, extremes of vertical shears of wind were estimated.