A crescent-shaped sand dune with its horns pointing downwind, formed where a limited sand supply moves across a firm, relatively flat desert surface under a wind blowing consistently from one direction. Barchan dunes migrate as a whole across the desert floor as sand is eroded from the windward slope and deposited over the crest onto the steeper leeward slip face.
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Source Barchan (Wikipedia)
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Barchan (Wikipedia)
Shaped By: Aeolian Processes, LeadQuote, Shaped By: Aeolian Processes, Lead
Barchans "face" the wind, appearing convex, and are produced by wind action predominantly from one direction.
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