The analysis on the micro-meteorological factors and surface parameters of sand during a sand dust storm

According to the information of the field observation in the northern margin of the Badanjinlin Desert Guaizihu region,we analyzed the changes of meteorological elements that happened on April 7,2010 in the area before and after the dust storm,and calculated some of the parameters in the sediment.The results showed that before the dust storm,the wind speed and direction underwent a process of fluctuation from an adjustment to an acceleration in the dust storm when the air was warm and dry,sandy ground was in a state of high temperature and low humidity,air pressure and vapor pressure were also significantly decreased,which were conducive to some sand surface.The largest wind speed time was the most severe sand flow time.The critical wind speed for sand moving at 100 cm was about 6.5m/s,the average roughness was 0.0014m;Average surface friction velocity was 0.29m/s.Fitting equation with wind speed at 200 cm was y = 0.0417x +0.0175,correlation coefficient R = 0.9199.