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Sand dunes are also known as Barchans. Barchans are the dunes formed in a crescent-shaped and are also known as Barkhan dunes. These are mostly formed by the wind from one direction and appear convex. 
Barchans sand dunes are formed when sand departs from the top of the dune and it produces a low-rise trailing wall that extends backwards to reach the desert bottom. From the extremities on each side towards the centre, the trailing wall takes on the shape of a crescent moon when it is one-quarter full.
The crescent form can be disrupted if the wind direction changes significantly.

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