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Science 12 August 1988:
Vol. 241. no. 4867, pp. 820 - 823
DOI: 10.1126/science.241.4867.820
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Articles

Simulation of Eolian Saltation

Robert S. Anderson 1 and Peter K. Haff 1

1 Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, CA 91125

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.

Submitted on April 12, 1988
Accepted on June 10, 1988


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Science. ISSN 0036-8075 (print), 1095-9203 (online)