Physics
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pggp.rept..309g&link_type=abstract
In NASA, Washington Repts. of Planetary Geol. and Geophys. Program p 309 (SEE N85-23474 13-91)
Physics
Dunes, Environment Simulation, Venus Surface, Wind Tunnel Tests, Erosion, Quartz, Sands, Wind Effects, Wind Velocity
Scientific paper
The development of aeolian bedforms in the simulated Venusian environment has been experimentally studied in the Venus Wind tunnel. It is found that the development of specific bedforms, including ripples, dunes, and waves, as well as their geometry, are controlled by a combination of factors including particle size, wind speed, and atmospheric density. Microdunes are formed which are analogous to full-size terrestrial dunes and are characterized by the development of slip faces, internal cross-bedding, a low ratio of saltation path length to dune length, and a lack of particle-size sorting. They begin to develop at wind speeds just above saltation threshold and evolve into waves at higher velocities. At wind speeds of about 1.5 m/sec and higher, the bed is flat and featureless. This evolution is explained by a model based on the interaction of alternating zones of erosion and deposition and particle saltation distances.
Greeley Ronald
Leach Rod N.
Marshall Jonathan R.
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