Abstract:Using the 100 m tower atmospheric turbulence observation data offered by National Climate Centre, wind shear exponents in different underlying surfaces and different atmospheric stabilities are analyzed. The experiments were carried out in Xilinhot City in Inner Mongolia, Huanghua City in Hebei, Hukou County and Xingzi County in Jiangxi during 2009-2011. The results show that (1) in inland simple terrain, the overall wind shear exponent >0.3 appears only in stable and very stable stratification, and the frequency of stratified shear exponent >0.4 is 2.95%. (2) In the coastal flat terrain, atmospheric stratification is more stable, the overall wind shear exponent has higher value, and the frequency of stratified shear exponent >0.4 is 4.2%. (3) Although Xingzi and Hukou both belong to the inland lake complex terrain, the terrain of Xingzi is more complex. The overall wind shear exponent >0.3 has high frequency, and stratified wind shear exponent >0.4 has the frequency up to 10%. However, in Hukou, the local lake land air circulation has a bigger effect. The overall wind shear exponent value >0.3 has lower frequency, and the frequency of stratified wind shear exponent >0.4 is 3.37%. (4) According to the design requirements for wind turbine generator systems, wind shear exponent is 0.2, which may overestimate the wind speed of hub height.