Barchan

  • Hicham ElbelrhitiEmail author
  • Henrik Hargitai
Living reference work entry
DOI: https://doi.org/10.1007/978-1-4614-9213-9_12-1

Definition

Barchans are propagating crescent-shaped dunes that form under limited supply of sand, in roughly unidirectional winds (or current flow) and un-vegetated areas (Fryberger 1979; Wasson and Hyde 1983) on firm, coherent basement (Cooke et al. 1993, p. 371).

Category

Synonyms

Description

Isolated crescent-shaped mobile dune which has insufficient sediment supply to cover the entire substratum. The horns of a barchans point in the direction of dune movement. They may be scattered over bare rock surfaces. Barchans possess a windward side (convex side) and a steeper lee side with two horns that face downwind and a slip face.

Morphology and Morphometry

Geomorphic Features of a Barchan

  1. (1)

    The windward (upwind/stoss; for submarine barchans: upstream)-side is convex; slope is gentle (Fig. 4). On Earth, the dip of the windward sides is 8–20° (average maximum: 12°) (e.g., Sauermann et al. 2000). Saltation is the dominant...

Keywords

Windward Side Wind Regime Dune Field Barchan Dune Dune Form 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Département des Sciences Fondamentales et Appliquées (DSFA)Institut Agronomique et Vétérinaire Hassan II10101-RabatMorocco
  2. 2.Planetary Science Research GroupEötvös Loránd UniversityBudapestHungary