| 沙漠与沙漠化 |
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| Field Measurements of Sand Transport Rate Change under Easterly Wind Condition over Gobi Land atop Mogao Grottoes |
| LIU Ben-li1, ZHANG Wei-min1, LIU Xiao-ning1, ZHANG Guo-bin2, QIU Fei2, ZHAN Hong-tao2 |
| 1.Dunhuang Gobi Desert Ecological and Environmental Research Station & Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; 2.The Conservation Institute of Dunhuang Academy, Dunhuang 736200, Gansu, China |
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Abstract Based on the simultaneous observational data of wind-sand flow structure over Gobi land during a sand storm, the temporal and spatial variations of sand transport rate and wind-sand flow structure at different observation points atop Mogao Grottoes were measured and analyzed. The result shows that in condition of easterly wind, when wind speed was about 10 m·s-1, there appeared a balanceable stage of sand transport rates in the horizontal direction at different observing points, where the sand transport rates at different points from the cliff to the sand mountain were nearly the same. When wind speed was stronger than 10 m·s-1, the main wind-sand activities were wind erosion and transportation, and long distance transportation of sand material from Gobi land to the Mingsha Mountain was obvious; when wind speed was below 10 m·s-1, the long distance transportation of sand material was not strong. Under different wind speed and sand supply conditions, wind-sand flow structure and sand-transporting character may have significant changes. With the help of Lattau's equation of sand transport rate, we used the data of wind speed and sand transport rate to calculate the temporal and spatial variations of sand transport rates at different observing points. According to the calculation, the transfer efficiency of the Gobi land atop Mogao Grottoes is about 60%.
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Received: 12 September 2009
Published: 20 May 2010
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2010, Vol. 30 
