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On the crescentic shape of barchan dunes

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  • P. Hersen

Abstract

Aeolian sand dunes originate from wind flow and sand bed interactions. According to wind properties and sand availability, they can adopt different shapes, ranging from huge motion-less star dunes to small and mobile barchan dunes. The latter are crescentic and emerge under a unidirectional wind, with a low sand supply. Here, a 3d model for barchan based on existing 2d model is proposed. After describing the intrinsic issues of 3d modeling, we show that the deflection of particules in reptation due to the shape of the dune leads to a lateral sand flux deflection, which takes the mathematical form of a non-linear diffusive process. This simple and physically meaningful coupling method is used to understand the shape of barchan dunes. Copyright Springer-Verlag Berlin/Heidelberg 2004

Suggested Citation

  • P. Hersen, 2004. "On the crescentic shape of barchan dunes," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 37(4), pages 507-514, February.
    • Handle: RePEc:spr:eurphb:v:37:y:2004:i:4:p:507-514
    DOI: 10.1140/epjb/e2004-00087-y
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    Cited by:

    1. HASSANE GANDA Rabi & HAMIDOU Haoua & SALEY Bisso, 2017. "Modeling and Numerical Simulation of Sand Dunes Formation," Journal of Mathematics Research, Canadian Center of Science and Education, vol. 9(4), pages 78-86, August.
    2. Zhang, Yong & Sun, HongGuang & Stowell, Harold H. & Zayernouri, Mohsen & Hansen, Samantha E., 2017. "A review of applications of fractional calculus in Earth system dynamics," Chaos, Solitons & Fractals, Elsevier, vol. 102(C), pages 29-46.

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