(Article of periodic en Anglais - 2010)

Document title

The influence of dunes on mixing in a migrating salt-wedge : Fraser River estuary, Canada

Authors(s) and Affiliation(s)

KOSTASCHUK R. (1) ; BEST J. (2) ; VILLARD P.V. (3) ;
(1) Dep. of Geography, Univ. of Ontario, Guelph, CANADA
(2) Dep. of Geology and Geography, West Virginia Univ., Morgantown, ETATS-UNIS
(3) Geomorphic Solutions, The Sernas Group Inc., Ontario, Mississauga, ETATS-UNIS


Flow visualization with an echosounder and velocity measurements with an acoustic Doppler current profiler over areas of flat-bed and sand dunes in the highly-stratified Fraser River estuary, Canada, were used to examine the effect of dunes on interfacial mixing. As the salt-wedge migrates upstream over the flat-bed, mixing is restricted to the lower portion of the water column. However, as the salt-wedge migrates into the dune field from the flat bed, there is a change in the flow, and large internal in-phase waves develop over each of the larger dunes, with water from the salt-wedge reaching the surface of the estuary. It is showed that bed friction is more important in interfacial mixing over the dunes than over the flat-bed, and that the salt-wedge flow over the dunes is mainly supercritical


Article of periodic

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

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

Millesime : 2010, vol. 35, no4 [pp. 460-465]

Bibliographic references : 36 ref.

Collation : 4 fig., 2 tabl.



INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.1928

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2010
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