Journal ArticleDOI
Steady state saltation in air
J. E. Ungar,Peter K. Haff +1 more
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In this paper, coupled equations of motion for steady state saltation over an infinite plane are derived and solved for a simplified model of the grain-surface impact process, which is qualitatively reproduced, including a diminution of the sub-saltation layer mean wind speed, as the friction speed increases.Abstract:
Coupled equations of motion for steady state saltation over an infinite plane are derived and solved for a simplified model of the grain-surface impact process. Experimentally observed features of the wind velocity profile in saltation are qualitatively reproduced, including a diminution of the sub-saltation layer mean wind speed, as the friction speed increases. In this model the surface impact velocity of the saltating grains remains relatively constant over a wide range of free-stream shear stresses, and the grain mass flux increases with friction speed uf* less rapidly than uf3.read more
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The physics of wind-blown sand and dust
TL;DR: The physics of aeolian saltation, the formation and development of sand dunes and ripples, the physics of dust aerosol emission, the weather phenomena that trigger dust storms, and the lifting of dust by dust devils and other small-scale vortices are reviewed.
Journal ArticleDOI
The physics of wind-blown sand and dust
TL;DR: In this article, an extensive review of the physics of wind-blown sand and dust on Earth and Mars is presented, including a review of aeolian saltation, the formation and development of sand dunes and ripples, dust aerosol emission, weather phenomena that trigger dust storms, and the lifting of dust by dust devils and other small-scale vortices.
Book
Physics and Modelling of Wind Erosion
TL;DR: In this paper, the Dynamics and Modelling of Saltation of Dust Emission, Dust Transport and Deposition, Integrated Wind-Erosion Modelling, Sand Dunes, Dynamics and Modeling, and Techniques for Wind Erosion Measurements are presented.
Journal ArticleDOI
Bagnold, R.A. 1941: The physics of blown sand and desert dunes. London: Methuen:
Journal ArticleDOI
Simulation of eolian saltation.
Robert S. Anderson,Peter K. Haff +1 more
TL;DR: The evolution of the saltating population and all its characteristic profiles is calculated from inception by pure aerodynamic entrainment through to steady state, and calculated steady state mass fluxes are within the range ofmass fluxes measured in wind tunnel experiments.
References
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Journal ArticleDOI
Saltation of uniform grains in air
TL;DR: In this paper, the interaction between a turbulent wind and the motion of uniform saltating grains of sand or soil, so massive as to fail to enter into suspension, is examined on the basis of two complementary hypotheses.
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Soil Transport by Winds on Mars
TL;DR: In this paper, a semi-empirical formula is developed for estimating the total amount of surface material moving in eolian saltation, surface traction, and suspension on the surface of Mars, and the ratio of final particle speed to the particle threshold friction speed is found to be several times that of saltation on earth.
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Magnus effect in saltation
Bruce R. White,Jan C. Schulz +1 more
TL;DR: In this paper, high-speed motion pictures (2000 frames/s) of saltating spherical glass microbeads (of diameter 350-710 μm and density 2·5 g/cm3) were taken in an environmental wind tunnel to simulate the planetary boundary layer.
Journal ArticleDOI
The Equilibrium of Grains on the Bed of a Stream
TL;DR: In this article, the conditions under which movement begins depend, not only upon the speed, but also upon the nature of the motion in the stream itself: viscous steady motion, steady inviscid motion, and turbulent motion act somewhat differently, and the speed necessary to dislodge grains differs appreciably.