Simulating study on barchan dune |
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| Authors: | Ling Yuquan Wu Zheng Liu Shaozhong and Li Changzhi |
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| Institution: | (1) Institute of Desert Research, the Chinese Academy of Sciences, 730000 Lanzhou, P. R. China;(2) South China Normal University, 510631 Guangzhou, P. R. China;(3) Institute of Computer Application, the Chinese Academy of Sciences, 610041 Chengdu, P. R. China |
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| Abstract: | Barchan dune is one of the basic forms of eolian landform, it is usually moulded by high-concentration non-saturated wind-sand
flow. The formation process of barchan dune begins from “wave-grain duality” of wind-sand movement, and goes through two developmental
stages of sand material accumulating (high-concertration saturated wind-sand flow) and dune form moulding (high-concentration
non-saturated wind-sand flow), i.e. the processes of dissipative increase and dispersive decrease. The scattered single barchan
dunes on non-sandy bed surface have obvious characteristics of mobility and unstability (not including barchan sand hill).
The formation of barchan dune in wind tunnel (its dune scale is one order of magnitude larger than sand ripple scale) is helpful
to know the formation mechanism of barchan dunes.
One of the series achievements supported by the National Natural Science Fundation of China (No. 49371009) |
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| Keywords: | barchan dune simulating experiment dissipative feature dispersive feature |
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