Physics
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pggp.rept..307b&link_type=abstract
In NASA, Washington Repts. of Planetary Geol. and Geophys. Program p 307-308 (SEE N85-23474 13-91)
Physics
Environment Simulation, Landforms, Particle Size Distribution, Sands, Venus (Planet), Venus Surface, Wind Tunnel Tests, Mass Transfer, Venus Atmosphere, Wind Effects, Wind Velocity
Scientific paper
Wind tunnel studies involving mixtures of particle sizes (bimodal and multimodal distributions) indicate the microdunes and related ridge- and wave-like structures can occur over a wider range of conditions. The results indicate that the bedforms develop as a consequence of the effective sorting capability of the high-density Venusian atmosphere. Four mixtures of different particle-size distributions were investigated. The results of these experiments suggest that: (1) small-scale bedforms on Venus may be more common than previously anticipated from simulations involving only unimodal sands; (2) small particles are rapidly sorted on Venus if winds slightly above threshold are available; (3) coarse particles are transported in traction within the bedforms as well as rolled by saltating fines, suggesting that the capacity of wind on Venus to transport material is greater than anticipated from previous flux studies and (4) microdunes and related ridges and waves with coarse and fine layers can be produced during sorting.
Bougan S. J.
Greeley Ronald
Marshall Jonathan R.
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