An experimental study of aeolian structures on Venus

Physics

Scientific paper

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Dunes, Sediment Transport, Venus Surface, Wind Effects, Aeolian Tones, Beds (Geology), Magellan Project (Nasa), Venus Atmosphere, Wind Tunnel Tests

Scientific paper

Experiments to simulate the formation of aeolian bed forms on Venus show that a high-density atmosphere produces small transverse bed forms with dimensionless similarities to terrestrial dunes but with both dimensional and behavioral similarities to subaqueous current ripples. Their development is influenced by wind speed, particle size, and atmospheric density. Although aeolian bed forms should be observed at all elevations on Venus, their optimum expression is compatible with the lowest elevations where atmospheric pressure is greatest. Their development is relatively unhindered by the presence of dense grains, the lack of sorting in source sediment from which they form, or the addition of cohesive dust. Small (about 10 cm) bed forms are efficient in sorting materials either by density or particle size. Bed forms developed in the limited size of the wind tunnel are probably representative of small bed forms on Venus; considerations suggest that bed forms on Venus may grow to larger sizes. Discovery of dune fields on Magellan images of Venus support this prediction.

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