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(bɑːˈkɑːn) ,






(Physical Geography) a crescent-shaped shifting sand dune, convex on the windward side and steeper and concave on the leeward
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2--Ideal Horn of a barchans dune disappeared; because of its redistribution for urban sprawl.
Barchans arise in deserts where the ground is hard and flat and strong winds blow sand in one direction.
Scientists have used the dwellings as a fixed geographic reference to measure the migration of giant wind-blown crescent-shaped dunes, or barchans.
For several years, scientists have used the buildings to measure the movement of giant crescent-shaped dunes called barchans across the desert.
Isolated barchans located dose to dune fields are locally imaged on the multibeam bathymetry map (Pinet et al.
Barchans are crescent-shaped dunes formed on relatively hard desert floors where there is a limited supply of sand and a strong prevailing wind.
However, as a result of increased wind strength during climatic variations in the Pleistocene glacial periods, the barchans were remodelled to long, linear, seif dunes.
Small, mobile, crescent dunes (333 ft [1-10 m] tall and 7-164 ft [2-50 m] long) are known as barchans.
The surface sand is subject to the action of the wind, which piles sand into dunes, barchans, and huge sand mountains that can reach a height of 394 ft (120 m) (see also photo 141).
Some pyramidal dunes may rise 656-984 ft (200-300 m) above the relief of the barchans.