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- W2103806872 abstract "A self-consistent model which describes transverse dune migration in equilibrium is introduced. It shows that an equilibrium expression for dune migration speed (c d) must take into account sand trapping efficiency (T E), and that T E is strongly related to the wind speedup over the windward surface. An expression for sand trapping efficiency (T E) is analytically derived from a microscale analysis of sand grain deposition on the slip face. Sand trapping efficiency (T E) is mainly determined by shear velocity on a level surface (u*(−∞)), and rapidly decreases as u*(−∞) increases. For each dune height (H), dune migration speed (c d) first increases, and then decreases monotonically after reaching the maximum, as the shear velocity on a level surface (u*(−∞)) increases. Dune migration speed (c d) is not inversely proportional to dune height (H). For low dunes, small sand trapping efficiency (T E) suppresses c d, whereas for high dunes, wind speedup and large T E resist the decrease of c d. Some field data show the same tendency. The dune-to-plane-bed transition observed in subaqueous and venusian bedforms could be associated with the decrease of sand trapping efficiency (T E). Copyright © 2000 John Wiley & Sons, Ltd." @default.
- W2103806872 created "2016-06-24" @default.
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- W2103806872 date "2000-01-01" @default.
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- W2103806872 title "Relations of sand trapping efficiency and migration speed of transverse dunes to wind velocity" @default.
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- W2103806872 doi "https://doi.org/10.1002/1096-9837(200009)25:10<1069::aid-esp117>3.0.co;2-d" @default.
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