湖北省不同地形条件下风随高度变化研究  

The Study on Wind Speed Change with Height Under Different Terrain Conditions in Hubei Province

作　　者：刘敏[1] 孙杰[1] 杨宏青[1] 袁业畅[1] 

机构地区：[1]武汉区域气候中心,武汉430074

出　　处：《气象》2010年第4期63-67,共5页Meteorological Monthly

基　　金：国家发展与改革委员会"全国大型风电场建设前期工作"项目(2003408);"全国风能资源详查和评价"项目(20071380);湖北省发展与改革委员会"湖北省风能资源评价"项目(2004242);湖北省气象局科技发展基金重点项目(2005Z03)资助

摘　　要：为了揭示湖北省不同地形条件下风速随高度的变化特征,利用黄冈龙感湖、大悟仙居顶和钟祥华山观70 m测风塔1年的完整测风资料,采用线性分析、最小二乘法拟合等方法,对不同地形条件下风速切变指数的日变化、季节变化、年变化以及不同风速段内的变化特征进行了分析。研究发现华山观处风速随高度的变化最大,龙感湖次之,仙居顶处最小;且切变指数随高度的上升有不同的变化趋势,其日变化曲线接近正弦波形;季节性差异明显;在大风情况下,风速的垂直切变指数与一般情况下相比,均出现显著减小。结果表明,在复杂地形条件下,地形和下垫面对风速的垂直变化存在显著的影响。The vertical wind shear characteristics under the different terrain conditions are explored by using the observed data of whole year in Longganhu of Huanggang, Xianjuding of Dawu and Huashanguan of Zhongxiang, and the change characteristics such as daily and seasonal variations are analyzed with meth- ods of linear analysis and least-squares fitting. The results showed that, the variability of wind speed in Huashanguan is the biggest as the sea level increases, and followed by Longganhu, and the smallest is Xianjuding. Moreover, the trends in wind shear index are different with increasing heights, the curve of daily change is near the sinusoidal waveform; the seasonal variations in different terrain conditions are shown obviously. Compared with the normal circumstances, the vertical wind shear index is significantly reduced in windy conditions. Finally, a conclusion may be drawn that there is a significant impact of ter- rain and the underlying surface on the vertical change of wind.

关 键 词：切变指数 垂直变化 α值 

分 类 号：P343.6[天文地球—水文科学]