A Steady-State Model of Wind-Blown Sand Transport

Werner, B. T.

doi:10.1086/629371

Cited by 232 publications

(242 citation statements)

References 20 publications

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“…However, the total sand flux is composed of the reptation and saltation sand fluxes. Andreotti 27 proposed that the reptation flux scales with u* 2 , and that the total flux scales with ðu Ã2 À u Ã2 t Þ 1:2 , which is a relation also proposed by Werner 39 . We therefore assume the repton flux q r to scale with the total flux q as qBq r 1.2 for u* above the threshold.…”

Section: Methodsmentioning

confidence: 61%

Threshold for sand mobility on Mars calibrated from seasonal variations of sand flux

et al. 2014

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Coupling between surface winds and saltation is a fundamental factor governing geological activity and climate on Mars. Saltation of sand is crucial for both erosion of the surface and dust lifting into the atmosphere. Wind tunnel experiments along with measurements from surface meteorology stations and modelling of wind speeds suggest that winds should only rarely move sand on Mars. However, evidence for currently active dune migration has recently accumulated. Crucially, the frequency of sand-moving events and the implied threshold wind stresses for saltation have remained unknown. Here we present detailed measurements of Nili Patera dune field based on High Resolution Imaging Science Experiment images, demonstrating that sand motion occurs daily throughout much of the year and that the resulting sand flux is strongly seasonal. Analysis of the seasonal sand flux variation suggests an effective threshold for sand motion for application to large-scale model wind fields (1-100 km scale) of t s ¼ 0.01±0.0015 N m À 2 .

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Section: Methodsmentioning

confidence: 61%

Threshold for sand mobility on Mars calibrated from seasonal variations of sand flux

et al. 2014

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“…Recent experiments [9,10] and numerical simulations [11,12,13,14] have focused on the saltation impacts. It is worth recalling the main results.…”

Section: Collision Processmentioning

confidence: 99%

Dynamics of aeolian sand ripples

Csahók

Misbah

Rioual

et al. 2000

The European Physical Journal E

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We analyze theoretically the dynamics of aeolian sand ripples. In order to put the study in the context we first review existing models. This paper is a continuation of two previous papers [3,4], the first one is based on symmetries and the second on a hydrodynamical model. We show how the hydrodynamical model may be modified to recover the missing terms that are dictated by symmetries. The symmetry and conservation arguments are powerful in that the form of the equation is model-independent. We then present an extensive numerical and analytical analysis of the generic sand ripple equation. We find that at the initial stage the wavelength of the ripple is that corresponding to the linearly most dangerous mode. At later stages the profile undergoes a coarsening process leading to a significant increase of the wavelength. We find that including the next higher order nonlinear term in the equation, leads naturally to a saturation of the local slope. We analyze both analytically and numerically the coarsening stage, in terms of a dynamical exponent for the mean wavelength increase. We discuss some future lines of investigations.

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“…Ever since, many successors have attempted to evaluate the previous or develop new models. Consequently, many models have been published (Kawamura, 1951;Zingg, 1953;Kuhlman, 1958;Owen, 1964;Kadib, 1965;Hsu, 1971;Kind, 1976;Maegley, 1976;Radok, 1977;Lettau and Lettau, 1978;Nakashima, 1979;Takeuchi, 1980;Horikawa et al, 1984;Sarre, 1987;Sherman and Hotta, 1990;Werner, 1990;Sherman et al, 1998). All of the published models are based on a set of ideal conditions.…”

Section: Introductionmentioning

confidence: 99%