The Longitudinal or Seif Dune. Whale-Backs and Miscellaneous Forms
IN the barchan dune the straightforward relationships between the rate of sand movement, the speed of advance, the surface angle, and the height were all based on three assumptions: (a) that the wind is uni-directional, (b) that the rate of sand supply is symmetrical on either side of the longitudinal axis, and (c) that the surface of the slip-face is in complete shelter, so that the face traps all the sand passing over its brink. When these assumptions become untenable, no simple deductions can be drawn as to the stability of the resulting sand forms.
KeywordsWindward Side Wind Regime Dune System Repetition Distance Storm Wind
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