A wind tunnel study of aeolian sand transport on a wetted sand surface using sands from tropical humid coastal southern China |
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Authors: | Qingjie Han Jianjun Qu Kongtai Liao Shujuan Zhu Kecun Zhang Ruiping Zu and Qinghe Niu |
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Institution: | (1) Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute (CAREERI), Chinese Academy of Sciences (CAS), Lanzhou, Gansu Province, 730000, China;(2) Dunhuang Gobi and Desert Ecology and Environment Research Station, CAREERI, CAS, Dunhuang, Gansu Province, 736200, China;(3) Forestry Scientific Technology Extension Station of Gansu, Lanzhou, Gansu Province, 730046, China;(4) Gansu Desert Control Research Institute, Wuwei, Gansu Province, 733000, China |
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Abstract: | This article reported a wind tunnel test of sediment transport related to surface moisture content and wind velocity using
sands from tropical humid coastal area. A 1 mm-thick portion of surface sand was scraped using a self-made sediment sampler,
and the gravimetric moisture content was determined. Sand transport was measured via a standard vertical sand trap with a
60 cm height. The result shows that the sand transport profile above the wet surface can be expressed with an exponential
equation. In general, the influence of moisture content on sand transport profile mainly focuses on the bottom of the blowing
sand cloud. Meanwhile, with moisture content increased, total sand transport dropped, and a relatively larger proportion is
transported at greater heights. The vertical movement of particles on higher moisture surface (0.587% < M < 1.448%) is more sensitive to moisture content variation as compared to those on low wet surface (M < 0.587%), total sand transport rate tends to be rather low (0.99 g cm−1 s−1) when M > 1.448%. The total sand transport rate varying with moisture content is divided into three regions of differing gradient
at the moisture contents of 0.587 and 1.448%. The gradient of the curve reflected the different influences of the various
water forms in surface sediments. The higher moisture surface (M > 1.448%) merely functions as a transport plain for the saltation material. Surface moisture content was the dominant control
factor for saltation activity between the moisture contents of 0.587 and 1.448%, wind velocity could resume control saltation
after the surface dried to the extent (M < 0.587%). |
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