A Model of Barchan Dunes Including Lateral Shear Stress

Details A Model of Barchan Dunes Including Lateral Shear Stress A Model of Barchan Dunes Including Lateral Shear Stress

2003-04-30

arxiv.org/abs/cond-mat/0304695v2

Physics

Condensed Matter

submitted to European Physical Journal, E

Scientific paper

Barchan dunes are found where sand availability is low and wind direction quite constant. The two dimensional shear stress of the wind field and the sand movement by saltation and avalanches over a barchan dune are simulated. The resulting final shape is compared to the results of a model with a one dimensional shear stress. A characteristic edge at the center of the windward side is discovered which is also observed for big barchans. Diffusion effects reduce this effect for small dunes.

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