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Evolution of crescent-shaped sand dune under the influence of injected sand flux: scaling law and wind tunnel experiment
- Zhang, Yang, Wang, Yuan, Zhou, Xiaosi, Yang, Bin
- Journal of Arid Land 2017 v.9 no.2 pp. 270-277
- algorithms, arid lands, dunes, image analysis, sand, wind tunnels
- This paper studies the evolution of crescent-shaped dune under the influence of injected flux. A scaling law and a wind tunnel experiment are carried out for comparison. The experiment incorporates a novel image processing algorithm to recover the evolutionary process. The theoretical and experimental results agree well in the middle stage of dune evolution, but deviate from each other in the initial and final stages, suggesting that the crescent-shaped dune evolution is intrinsically scale-variant and that the crescent shape breaks down under unsaturated condition.