The Analytical Calculation of the Threshold for Dust Emission in the Hinterland of the Taklimakan Desert
The threshold sand-moving wind speed is a key indicator of the sand activities,it can determine the activities,it will change with the surface conditions and atmospheric environment. To further understand the variation of the threshold sand-moving wind speed under field conditions, This paper selected Tazhong of the hinterland of Taklimakan Desert as the research Area,on the basis of considering the size of the surface soil,soil moisture, air density and other factors,the paper use the empirical formula to calculate the threshold sand-moving wind speed of each month in this area.The conclusions are as follows:(1)the fluid critical threshold sand moving wind speed of 2 m height ranged from 0.24 m/s to 0.36 m/s at Tazhong,the mean is 0.31 m/s;(2)the threshold sand-moving wind speed of 2 m height is between 3.9 m/s and 5.9 m/s at Tazhong,the mean is 5.1 m/s;(3) in all of the threshold for dust emission, the maximum is in summer, the second highest in winter, and spring is the minimum. Thus it can provide scientific methods for the prevention and control the sandstorm at Tazhong area.
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