单词	barchan
释义	barchan /ˈbɑːk(ə)n / noun A crescent-shaped shifting sand dune, as found in the deserts of Turkestan.Now a team publishing in the 23 December print issue of PRL reports it has generated miniature replicas of crescent-shaped dunes known as barchans in a water tank.... Transverse ridges have a higher sand supply than barchans but also exist in unidirectional winds. As he described them to the nomads of the Empty Quarter, they thought of the hard dark dunes found in their own desert called barchan dunes. Origin Late 19th century: from Turkic barkhan.
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