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Secondary flow deflection in the lee of transverse dunes with implications for dune morphodynamics and migration

Auteur(s) et Affiliation(s)

WALKER, I.J.
Dept. of Geography , Univ., Victoria, Canada
SHUGAR, D.H.
Dept. of Geography , Univ., Victoria, Canada


Description :
Measurements of lee-side airflow response from an extensive array of meteorological instruments combined with smoke and flow streamer visualization is used to examine the development and morphodynamic significance of the lee-side separation vortex over closely spaced transverse dune ridges. A differential deflection mechanism is presented that explains the three-dimensional pattern of lee-side airflow structure for a variety of incident flow angles. The results document the three-dimensional nature of flow and sand transport over transverse dunes and provide empirical evidence for an oblique migration model.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2013, vol. 38, n°. 14, p. 1642-1654, nombre de pages : 13, Références bibliographiques : 2 p.

Date :
2013

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais
Droits :
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