Estimated grain saltation in a Martian atmosphere

Details Estimated grain saltation in a Martian atmosphere Estimated grain saltation in a Martian atmosphere

Sep 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975aiaa.confq....w&link_type=abstract

American Institute of Aeronautics and Astronautics and American Geophysical Union, Conference on the Exploration of the Outer Pl

Computer Science

Numerical Analysis

Mars Atmosphere, Particle Trajectories, Soil Erosion, Wind Effects, Atmospheric Turbulence, Equations Of Motion, Friction Drag, Granular Materials, Laminar Boundary Layer, Lift, Mars Surface, Numerical Analysis, Slip Flow, Three Dimensional Flow, Turbulence Effects, Turbulent Wakes, Wind Tunnel Tests

Scientific paper

The aeolian mechanics of saltating grains on Mars is studied using both an experimental investigation in an atmospheric wind tunnel and numerical solutions to the equations of motion of a single grain under Martian surface conditions. Numerical solutions for terrestrial conditions are empirically correlated with experimental data for Mars, and the modified equations are solved to estimate Martian grain motion. The calculations demonstrate the importance of a lifting force in initiating grain motion on both planets. It is found that Martian grain-trajectory length scales are longer than those on earth and fall with a higher terminal grain velocity. The wind-tunnel experiments show that saltating grains have an enhanced erosive capability in crater wakes. It is suggested that this enhanced capability may well explain the streaks associated with craters in certain regions on the Martian surface.

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