Windblown dust on earth, Mars and Venus

Details Windblown dust on earth, Mars and Venus Windblown dust on earth, Mars and Venus

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jats...33.2425i&link_type=abstract

Journal of the Atmospheric Sciences, vol. 33, Dec. 1976, p. 2425-2429. Research supported by the Iowa State University of Scien

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22

Earth Atmosphere, Mars Atmosphere, Venus Atmosphere, Wind Effects, Cohesion, Dust Storms, Particle Size Distribution, Planetary Atmospheres, Planetary Surfaces, Reynolds Number, Sands, Soils, Thresholds

Scientific paper

Attempts to predict threshold speeds for windblown dust and sand on Mars and Venus have raised new questions about the mechanism of soil and sand transport by wind. Estimates of threshold speeds on Mars and Venus are made including the effects of both Reynolds number and interparticle forces of cohesion. The current estimates show lower threshold speeds for small particles than previous estimates by Hess, who assumed that Reynolds number is the only important parameter. These estimates, on the other hand, show somewhat higher threshold speeds than those of Sagan and Bagnold, who assumed that the particles are cohesionless. An optimum particle size results, for which threshold speed is a minimum, contrary to Sagan and Bagnold's prediction.

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