Changes of Wind Speed and Wind Energy over Gansu Corridor

Using the climatic data of wind speed at 19 stations in Hexi corridor during 1970-2002 and the intensive data of 10 min interval from 7 wind-towers in Gobi in 2004-2005,the wind speed of surface layer and evolution and distribution of wind energy in this region are studied.The result shows that the descendenting about wind speed in oasios of Hexi corridor is obvious,but it is stable in other areas in where its descenting trend is no obvious.The wind speed change exists periodic oscillation characteristic,and the vertical wind speed difference is to decrease from high to low near surface layer.The maximum or minimum wind speed values in high layer lag behind low layer.In while year,the maximum wind speed occurred from February to April,and the minimum one,in January and May. The wind speed with height according to the rules of natural logarithm increase,The wind energy rapidly change with height near the(8 m) levels of surface. The most of wind speed in Hexi corridor area is 4～12 m/s,which is main wind energy contributor.The resource of wind is very plenty in Hexi corridor that amount to 2200 khW/m~2 and over in 10～70 m layers near surface.