Question

explain formation of longitudinal dunes

Answer 1

A large, elongated dune lying parallel to the prevailing wind direction. Longitudinal dunes usually have symmetrical cross sections. They generally form in areas that are located behind an obstacle where sand is abundant and the wind is constant and strong.

Answer 2

Wind erosion on the back of the sand pile leads to the formation of a crest perpendicular to the wind direction and so to the formation of a slip face downwind. The wind boundary layer separates at this crest, forming a recirculation bubble. ... The sand pile then strikingly transforms into alongitudinal dune


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