Steady state saltation in air |
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Authors: | J E UNGAR P K HAFF |
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Institution: | Division of Physics, Mathematics, and Astronomy 301–38, California Institute of Technology, Pasadena, California 91125 |
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Abstract: | Coupled equations of motion for steady state saltation over an infinite plane are derived and solved for a simplified model of the grain-surface impact process. Experimentally observed features of the wind velocity profile in saltation are qualitatively reproduced, including a diminution of the sub-saltation layer mean wind speed, as the friction speed increases. In this model the surface impact velocity of the saltating grains remains relatively constant over a wide range of free-stream shear stresses, and the grain mass flux increases with friction speed uf* less rapidly than uf3. |
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