barchan


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barchan

[bär′kän]
(geology)
A crescent-shaped dune or drift of windblown sand or snow, the arms of which point downwind; formed by winds of almost constant direction and of moderate speeds. Also known as barchane; barkhan; crescentic dune.
References in periodicals archive ?
It's unclear why barchan dunes exist at all," says Pieter Vermeesch, a geologist at University College London.
Scientists have used the dwellings as a fixed geographic reference to measure the migration of giant wind-blown crescent-shaped dunes, or barchans.
Tuning up: New Solihull Operatic Society pianist Stephen Barchan is introduced to his new singing colleagues.
Barchan dunes (upper right) are crescent-shaped dunes that form where sand is not particularly abundant, through the action of moderate winds blowing in the same direction all year round; barchan dunes move in the direction the wind is blowing, and the leeward side is steeper than the windward side.
Margareta Barchan is the president and CEO of Celemi (www.
The tranquil turquoise waters of the Gulf are surrounded by white and golden crescent-shaped Barchan dunes which reflect all the golds and pinks of the sunrises and sunsets, casting dramatic shadows across the desert.
When this happens, the dune's leading edges curve around to form a crescent or barchan dune.
Alan Barchan, Two Centuries of Education in New South Wales, (NSW: NSW UP, 1988) 152-3; Millie Eichholzer (ed.
With her wide and solid expertise in metrology, and extensive experience in international marketing, Ms Sernevi has the ideal background for moving the group forward", says Jan Barchan, chairman of the board of AudioDev.
Net Insight's nomination committee consists of Jan Barchan, of Briban Invest; Lars Bergkvist, of Lannebo Fonder; Ramsay Brufer, of Alecta; Christian Brunlid, of Handelsbanken Fonder and Berg, chairman of the company's board.
While based with Richard Hannon, he has evidently caught the attention of Godolphin trainer Charlie Appleby, who supplied the mount on Barchan in the 32Red Casino Nursery.
The scientists, from Johns Hopkins University and Brigham Young universities in the US, and the University of Sousse in Tunisia, used satellite tracking to chart the progress of the barchan encroaching on Mos Espa, which they claim is moving at a rate of about 15 metres per year and has already reached some buildings on the town's fringe.