| 沙漠与沙漠化 |
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| Wind Tunnel Experiment of the Threshold Friction Wind Velocity on Wet Beach Sand Surface |
| HAN Qing-jie1,2, QU Jian-jun1,2, ZHANG Ke-cun1, ZU Rui-ping1,LIAO Kong-tai3, NIU Qing-he1 |
| 1.Key Laboratory of Desert and Desertification, Cold and Arid Regions Environments and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; 2.Dunhuang Gobi and Desert Ecology and Environment Research Station, Cold and Arid Regions Environments and Engineering Research Institute, Chinese Academy of Sciences, Dunhuang 736200, Gansu, China; 3.Gansu Desert Control Research Institute, Lanzhou 730000, China |
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Abstract Wind erosion is one kind of important geomorphology processes and geological disasters, which has significant impacts on dune growth and desertification, and causes damages to architecture on sea coasts. The moisture of sand surface layer greatly affects the threshold wind velocity and sand stability, thus, it is also one of the important influence factors on wind erosion. In this study, we investigated the influence of surface moisture content at 1-mm depth on sand erosion in tropical humid coast of southern China, and established a new predicting model. The modeling results indicated that the threshold friction velocity increased linearly with increasing of ln100M (M is gravimetric moisture content) in condition of given sand diameters. Evaluation was given to seven popular models for predicting the threshold friction velocity on moisture sediments, and found that there were significant differences among their predicted results. At a surface sand moisture content of 0.0124 (M1.5), the predicted threshold friction velocity predicted by the seven models were 34% to 195% larger than the observed threshold friction velocity on dry sands; at a surface sand moisture content of lower than 0.0062 (0.5 M1.5), the predicted values by models of Chepil and Saleh well matched the experimental data; but when surface sand moisture content of more than 0.0062 (0.5 M1.5), the data simulated by the Bellys empirical model were seem same as the experimental data.
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Received: 26 August 2010
Published: 20 November 2011
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2011, Vol. 31 
