What is meant by barchan?
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BARCHAN- a crescent shifting sand dune, as found in the desert of Terkestan .
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Hello friend
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A crescent shaped sand dune. The convex side of this dune is the windward side,while the concave side is opposite the flow of the wind. The windward convex side has gentle slope while concave side is steep.
When the wind carrying sand particles slow down or come across an obstacle,deposition takes places and heaps of sand develop. The flow of the wind diverts at the heap and wind starts blowing from both the sides of the heap.
Sand starts moving ahead along the direction of the wind and the heap gets a crescent shape. The windward side of the barchan keeps receiving sand particles and therefore,ripple marks are visible on this slope.
Thanks.
:)
____________________________
A crescent shaped sand dune. The convex side of this dune is the windward side,while the concave side is opposite the flow of the wind. The windward convex side has gentle slope while concave side is steep.
When the wind carrying sand particles slow down or come across an obstacle,deposition takes places and heaps of sand develop. The flow of the wind diverts at the heap and wind starts blowing from both the sides of the heap.
Sand starts moving ahead along the direction of the wind and the heap gets a crescent shape. The windward side of the barchan keeps receiving sand particles and therefore,ripple marks are visible on this slope.
Thanks.
:)
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