Characteristics of Blown Sand Environment in Tazhong Area of the Taklimakan Desert from 1996 to 2008

This paper,through the analysis on data of meteorological elements during 1996-2008 from Tazhong weather station and combining the observations in field and the calculations,analyzed the characteristics of the blown sand environment for recent 10 years in this area.The results are as follow: the average particle size of surface sand is about 2.88φ(136μm) in Tazhong area,which belongs to fine sand and very fine sand;the wind speed in Tazhong area assumes the decreasing trend totally,the annual average wind speed is lower than 2.5 m.s-1,and the month average wind speed present single-peaks distributing with maxima appearing from June to July;in desert hinterland,the wind direction and sand-moving wind direction was mainly easterly;the threshold velocity for transportation of sand at 2 meters height is about 4.1 m.s-1;the yearly wind erosion climatic factor index is 28.3;the yearly floating dust and blowing-dust days present the increasing trend and yearly dust storm days present the decreasing trend in recent years.