Question

Explanation of barchans and their diagram

Answer 1

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Barchan, also spelled Barkhan, crescent-shaped sand dune produced by the action of wind predominately from one direction. ... Barchans usually occur as groups of isolated dunes and may form chains that extend across a plain in the direction of the prevailing wind.

detonation....

A barchan or barkhan dune is a crescent-shaped dune. The term was introduced in 1881 by Russian naturalist Alexander von Middendorf, for crescent-shaped sand dunes in Turkestan and other inland desert regions. 

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