| 2010年烟台沙漠学术研讨会论文选 |
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| Observation of Dust Emission by Wind Erosion in Taklimakan Desert:Field experiment and preliminary report |
| HE Qing1,2, YANG Xing-hua1,2, ALI Mamtimin1,2, LIU Xinchun1,2, HUo Wen1,2 |
| 1.Institute of Desert Meteorology, China Meteorological Administration, Urumqi 830002, China; 2.Taklimakan Desert Atmosphere and Environment Observation Experiment Station, Tazhong 841000, Xinjiang, China |
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Abstract Field observation experiments on dust emission by wind erosion were conducted in Taklimakan Desert. Some analyzing results are obtained. The underlying surface situation directly influences sand flow structure. The sand-transporting volume of sand flow in Tazhong, Xiaotang and Ruoqiang decreases gradually with height. The sand-transporting volume at the height of 0~100 cm in Tazhong and Ruoqiang meets the exponential function completely, but that in Xiaotang deviates from the exponential function partially. 72.4%, 47.3% and 62.6% of sand-transporting volume at 0~100 cm are distributed in 0~30 cm in Tazhong, Xiaotang and Ruoqiang, respectively. The particles in sand flow are mainly fine sand, very fine sand and silt, in which 43.8%~75.5% is very fine sand. Wind speed profiles of near-surface layer follow u=azb distribution, and all the fitting coefficients are larger than 0.93. The change trend of rebounding particles is identical with that of wind speed at height of 2 meters, and the threshold friction velocities in Tazhong, Xiaotang and Ruoqiang are 0.25 m·s-1, 0.27 m·s-1, 0.21 m·s-1, respectively.
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Received: 30 August 2010
Published: 20 March 2011
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2011, Vol. 31 
