The European Physical Journal E

, Volume 16, Issue 1, pp 57–65 | Cite as

A model of Barchan dunes including lateral shear stress

Regular Articles

Abstract.

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 model with one dimensional shear stress is extended including surface diffusion and lateral shear stress. The resulting final shape is compared to the results of the model with a one dimensional shear stress and confirmed by comparison to measurements. We found agreement and improvements with respect to the model with one dimensional shear stress. Additionally, 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.

Keywords

Polymer Neural Network Thin Film Shear Stress Complex System 

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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005

Authors and Affiliations

  1. 1.Institute for Computer Applications 1, University of StuttgartStuttgartGermany
  2. 2.Departamento de FísicaUniversidade Federal do CearáFortalezaBrazil

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