Evidence for a new sand transport process from experiments on Saharan dunes

Hardisty, Jack; Whitehouse, R.J.S.

doi:10.1038/332532a0

Cited by 67 publications

(54 citation statements)

References 14 publications

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“…More recently, Hardisty and Whitehouse [41] have shown that the bedslope along the direction of motion modifies the threshold of motion (typically 15% for a 10…”

Section: Saltation Versus Reptationmentioning

confidence: 99%

Selection of dune shapes and velocities Part 1: Dynamics of sand, wind and barchans

Andreotti¹,

Claudin

Douady³

2002

The European Physical Journal B - Condensed Matter

274

246

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Abstract. Almost fifty years of investigations of barchan dunes morphology and dynamics is reviewed, with emphasis on the physical understanding of these objects. The characteristics measured on the field (shape, size, velocity) and the physical problems they rise are presented. Then, we review the dynamical mechanisms explaining the formation and the propagation of dunes. In particular a complete and original approach of the sand transport over a flat sand bed is proposed and discussed. We conclude on open problems by outlining future research directions.

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“…More recently, Hardisty and Whitehouse [41] have shown that the bedslope along the direction of motion modifies the threshold of motion (typically 15% for a 10…”

Section: Saltation Versus Reptationmentioning

confidence: 99%

Selection of dune shapes and velocities Part 1: Dynamics of sand, wind and barchans

Andreotti¹,

Claudin

Douady³

2002

The European Physical Journal B - Condensed Matter

274

246

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“…In this most simple case, the influence of the complicating factors mentioned above can be neglected. Efforts (mostly empirical) have been made to take account of the influence of moisture (Belly, 1964;Hotta et al, 1984;Sarre, 1988), vegetation (Wasson and Nanninga, 1986;Buckley, 1987) and slope (Howard et al, 1978;Hardisty and Whitehouse, 1988). Accurate prediction of aeolian transport in humid and coastal environments is not possible until the influence of all relevant factors can be quantified.…”

Section: Introductionmentioning

confidence: 99%

Rates of aeolian transport on a beach in a temperate humid climate

Arens

1996

Geomorphology

116

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Rates of aeolian transport on a beach in a temperate humid climateArens, S.M. Published in: Geomorphology DOI:10.1016/0169-555X(95)00089-N Link to publication Citation for published version (APA):Arens, S. M. (1996). Rates of aeolian transport on a beach in a temperate humid climate. Geomorphology, 17(1-3), 3-18. DOI: 10.1016/0169-555X(95)00089-N General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. AbstractShort term field measurements of aeolian transport, using a saltiphone, indicate that actual rates of transport deviate considerably from the potential rates predicted by transport equations. When examined in detail, however, potential rates are approached during spe,zial conditions: mostly when the wind blows offshore, parallel or slightly oblique to the beach and relative humidity is below 85%. Also, the potential rates of transport may be approached when wind speeds considerably exceed threshold speed, even during showers. The main cause of the large deviation of actual from potential rates is in the absence of transport during very wet conditions (prolonged rainfall) regardless of wind speed, and the variation of threshold velocity with time. The threshold velocity increases during wet conditions, with onshore winds or because of the presence of algae. Therefore, potential transport is defined as the transport optimum. To predict the actual rates of transport accurately, insight into the variation of the threshold velocity is essential. Aeolian transport of sand seems to be related to moderate events and not to extreme events, conforming to the principle of magnitude and frequency.

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“…The transport limiting processes could be represented by the upslope effect described by Hardisty and Whitehouse (1988). Also sediment supply from the marine zone could be very relevant where sediment supply can both, limit (or stimulate) transport and cause milder beach slopes.…”

Section: Discussionmentioning

confidence: 99%

“…Hardisty and Whitehouse (1988) quantify (empirically) the influence of bed slope on aeolian sediment transport rates. Their results imply that where the bed slope increases from 0 to 2 degrees, aeolian transport rates decrease in the order of 30-40%.…”

Section: Dune Volume Changes and Rdpmentioning

confidence: 99%