Physics – Geophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pggp.rept..268m&link_type=abstract
In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986 p 268-270 (SEE N87-23341 16-91)
Physics
Geophysics
Atmospheric Density, Dunes, Mars Surface, Ripples, Sands, Sediment Transport, Wind Effects, Wind Tunnel Tests, Atmospheric Pressure, Wind Velocity
Scientific paper
The effect of varying fluid density (rho) on particle transport was examined by conducting tests at atmospheric pressures between 1 and 0.004 bar in the Martian Surface Wind Tunnel (MARSWIT). This study specifically concerns the effect of varying rho on the character of wind ripples, and elicits information concerning generalized ripple models as well as specific geological circumstances for ripple formation such as those prevailing on Mars. Tests were conducted primarily with 95 micron quartz sand, and for each atmospheric pressure chosen, tests were conducted at two freestream wind speeds: 1.1 U*(t) and 1.5 U*(t), where U*(t) is saltation threshold. Preliminary analysis of the data suggests: (1) ballistic ripple wavelength is not at variance with model predictions; (2) an atmospheric pressure of approximately 0.2 bar could represent a discontinuity in ripple behavior; and (4) ripple formation on Mars may not be readily predicted by extrapolation of terrestrial observations.
Greeley Ronald
Marshall Jonathan R.
Miller Jeffrey S.
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