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Simulation of Eolian Saltation

Anderson, Robert S. and Haff, Peter K. (1988) Simulation of Eolian Saltation. Science, 241 (4867). pp. 820-823. ISSN 0036-8075. doi:10.1126/science.241.4867.820.

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Saltation is important in the transport of sand-sized granular material by wind and in the ejection of dust from the bed both on Earth and on Mars. The evolution of the saltating population and all its characteristic profiles is calculated from inception by pure aerodynamic entrainment through to steady state. Results of numerical simulations of single-grain impacts into granular beds are condensed into analytic expressions for the number and speeds of grains rebounding or rejected (splashed) from the bed. A model is combined with (i) this numerical representation, (ii) an expression for the aerodynamic entrainment rate, and (iii) the modification of the wind velocity profile by saltating grains. Calculated steady state mass fluxes are within the range of mass fluxes measured in wind tunnel experiments; mass flux is nonlinearly dependent on the shear velocity. Aerodynamically entrained grains in the system are primarily seeding agents; at steady state, aerodynamic entrainment is rare. The time for the entire system to reach steady state is roughly 1 second, or several long-trajectory hop times.

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Additional Information:© 1988 American Association for the Advancement of Science. Received 12 April 1988, accepted 10 June 1988. We thank B. T. Werner and S. Spicklemire for sharing their insights into this problem. We also acknowledge the helpful suggestions of three anonymous reviewers. This work was supported by the U.S. Army Research Office, contract DAAL-03-86-K-0132.
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Army Research Office (ARO)DAAL-03-86-K-0132
Issue or Number:4867
Record Number:CaltechAUTHORS:20150127-083806802
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Official Citation:Simulation of Eolian Saltation Robert S. Anderson and Peter K. Haff Science 12 August 1988: 241 (4867), 820-823. [DOI:10.1126/science.241.4867.820]
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:54123
Deposited By: Tony Diaz
Deposited On:27 Jan 2015 16:46
Last Modified:10 Nov 2021 20:29

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