barchan

• “It's what's technically known as a barchan, and the entire dune walks across the desert in a westerly direction at a speed of about 17 meters per year.”

  TED: Richard Dawkins on our "queer" universe

• “Earlier models predicted that crescent-shaped sand dunes called barchan dunes should grow to at least 500 meters long - but many are only 100 meters.”

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• “In case there is any mistake, Dawkins gives the example of a permanent dune - a barchan - that the wind pushes across the desert but which maintains it shape even while individual grains of sand are being blown into and out of the dune.”

  May 6th, 2009

• “Fine white grains of gypsum are blown by the winds to form a variety of dune types: dome-shaped, barchan, transverse, and parabolic.”

  Ecoregions of New Mexico (EPA)

• “Today's Astronomy Picture of the Day shows flowing barchan dunes on the surface of Mars.”

  The Lensman's Children

• “Dune types range from solitary barchan dunes to extensive longitudinal dunes (300 km long) in the southwest and colossal dune mountains in the northeast.”

  Arabian Desert and East Sahero-Arabian xeric shrublands

• “Tsugeer els and Altan els reserves typify north-central Asian desert ecosystems, with remnant mountains, barchan lowlands and green oases.”

  Uvs Nuur Basin, Russian Federation, Republic of Tuva and Mongolia

• “Actually, even a barchan is more of a 'thing' than a wave.”

  The God Delusion

• “In its place was a narrow, low dune that terminated in a higher barchan of mineral-rich sand.”

  Running From The Deity

• “You know, the important stuff, like Lady X, Monobrow, and the mating habits of barchan sand dunes.”

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