Saltation Threshold Mechanics

Iversen, J. D.

doi:10.1007/978-94-009-4388-9_24

Cited by 1 publication

(1 citation statement)

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“…These last authors refer to a 'supply limited system', where the total sediment flux is controlled by the ability of the surface to supply grains to the air stream. Among the factors influencing transport (for an overview see Nickling and Davidson-Arnott, 1990;Sherman and Hotta, 1990) are beach width (Nordstrom and Jackson, 1992), rainfall (Rutin, 1983;De Lima et al, 1992), surface moisture (Belly, 1964;Svasek and Terwindt, 1974;Hotta et al, 1984;Sarre, 1988), sediment characteristics such as density (Willetts, 1983;Iversen, 1985, Iversen, 1986 and shape (Willetts et al, 1982;Willetts, 1983;Rice, 1991), crust formation (Nickling and Ecclestone, 1981;Nickling, 1984) and vegetation (Bressolier and Thomas, 1977;Hesp, 1983;Wasson and Nanninga, 1986;Buckley, 1987). Transport equations thus far give a good (theoretical) prediction for the aeolian transport process in its most simple form, where the sand is dry, and source and fetch are infinite.…”

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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