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Connexion

(6GuelphInternat. Conf. on Aeolian Research (ICAR 6) en Anglais - 2008)

Document title

A three-dimensional analysis on lift-off velocities of sand grains in wind-blown sand flux

published at : ICAR 6 : Aeolian processes. Special issue

Authors(s) and Affiliation(s)

ZHENG X. (1) ; CHENG N. (1) ; XIE L. (1) ;
(1) Key Laboratory of Mechanics on Western Disaster and Environment, Univ., Lanzhou, CHINE

Abstract

This paper focuses on a key problem in wind-blown sand transport research, the lift-off velocities of sand grains. A three-dimensional grain-bed collision model comprising an impact sand grain, a creeping sand grain and a sustaining grain is presented. Based on this model, the analytical formulae of sand grains'linear and angular velocities are derived. Comparisons of the results with the results gained by a two-dimensional grain-bed collision model show that all components of both rebound and ejected velocities gained by the three-dimensional model are lower than the corresponding ones done by two-dimensional model apart from the horizontal rebound velocity. It also shows the lateral velocity and the lateral angular velocity, as well as the upward angular velocity, cannot be obtained by a two-dimensional model, and cannot be ignored when the impact velocity is high

Source

Congrès

Internat. Conf. on Aeolian Research (ICAR 6) No6, Guelph , CANADA (24/07/2006 - 26/07/2006)

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2008, vol. 33, no 12 [pp. 1824-1838]

Bibliographic references : 20 ref.

Collation : fig., tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.1740

Prodig - Bibliographie Géographique Internationale (BGI)
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