Study on Wind Speed Distribution of Surface Layer

Abstract

Through the analysis of atmospheric turbulence gradient observation data by the National Climate Center in Inner Mongolia, Hebei and Jiangxi Poyang Lake, to investigate the vertical distribution characteristics of wind speed near surface under different atmospheric stability conditions, the main conclusions are as follows: (1) in simple inland terrain, overall wind shear index >0.2 occurs in very unstable, stable and very stable stratification, is relatively small; in coastal flat terrain, the overall wind shear index high value appeared more in stable stratification; although Hukou and Xingzi both inland lake terrain along the mountain, but the terrain of Xingzi is more complex, air currents accelerate during mountain climbing, the overall wind shear index >0.2 has a high frequency .While the lake-land circulation has greater impact on Hukou, so the frequency of overall wind shear index >0.2 is closer to that of Huanghua. (2) In wind turbine design and selection, only consider the overall wind shear index in impeller diameter is not enough, the vertical variation of wind speed under the condition of complex terrain is unable to use a monotone function to describe.