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Article Dans Une Revue Physical Review E : Statistical, Nonlinear, and Soft Matter Physics Année : 2012

Particle velocity distribution in saltation transport

Tuan Duc Ho
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Alexandre Valance
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Résumé

We report on wind-tunnel measurements of particle velocity distribution in aeolian transport. By performing extended statistics, we show that for saltation occurring over an erodible bed the vertical lift-off velocity distributions deviate significantly from a Gaussian law and exhibit a long tail accurately described by a lognormal law. In contrast, saltation over a rigid bed produces Gaussian velocity distributions. These results strongly suggest that the deviation from Gaussian distributions is a consequence of the splash process which is exclusively present in saltation transport over an erodible bed. We further suggest that the non-Gaussian statistics is intimately related to the statistical properties of a single splash event which produces ejection of particles with lift-off velocities distributed according to a lognormal law. This lognormal behavior can be simply inferred from the propagation process of the impact energy through the granular bed which can be viewed as the analog of a fragmentation process. These findings emphasize the crucial role of the splash process in saltation transport.
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Dates et versions

hal-00752576 , version 1 (16-11-2012)

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Tuan Duc Ho, Pascal Dupont, Ahmed Ould El Moctar, Alexandre Valance. Particle velocity distribution in saltation transport. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, 2012, 85, pp.052301. ⟨10.1103/PhysRevE.85.052301⟩. ⟨hal-00752576⟩
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