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Titolo:
Response of a river plume during an upwelling favorable wind event
Autore:
Fong, DA; Geyer, WR;
Indirizzi:
MIT Woods Hole Oceanog Joint Program Oceanog, Woods Hole, MA USA MIT WoodsHole Oceanog Joint Program Oceanog Woods Hole MA USA e, MA USA Woods Hole Oceanog Inst, Dept Appl Ocean Phys & Engn, Woods Hole, MA 02543USA Woods Hole Oceanog Inst Woods Hole MA USA 02543 , Woods Hole, MA 02543USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
fascicolo: C1, volume: 106, anno: 2001,
pagine: 1067 - 1084
SICI:
0148-0227(20010115)106:C1<1067:ROARPD>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
OREGON CONTINENTAL-SHELF; COASTAL CURRENT; ESTUARINE STRATIFICATION; DRIVEN MOTION; MODEL; TURBULENCE; TRANSPORT; DISCHARGE; LAYER; ENTRAINMENT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Fong, DA Stanford Univ, Dept Civil & Environm Engn, Environm Fluid Mech Lab, Stanford, CA 94305 USA Stanford Univ Stanford CA USA 94305 Lab, Stanford, CA 94305 USA
Citazione:
D.A. Fong e W.R. Geyer, "Response of a river plume during an upwelling favorable wind event", J GEO RES-O, 106(C1), 2001, pp. 1067-1084

Abstract

The response of a surface-trapped river plume to an upwelling favorable wind is studied using a three-dimensional model in a simple, rectangular domain. Model simulations demonstrate that the plume thins and is advected offshore by the cross-shore Ekman transport. The thinned plume is susceptible to significant mixing because of the vertically sheared horizontal currents. The Ekman dynamics and shear-induced mixing cause the plume to evolve to aquasi-steady uniform thickness, which can be estimated by a critical Richardson number criterion. Although the mixing rate decreases slowly in time, mixing continues under a sustained upwelling wind until the plume is destroyed. Mixing persists at the seaward plume front because of an Ekman straining mechanism in which there is a balance between the advection of cross-shore salinity gradients and vertical mixing. The plume mixing rate observed is similar to the mixing law obtained by previous studies of one-dimensionalmixing, although the river plume mixing is essentially two-dimensional.

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Documento generato il 25/01/20 alle ore 04:04:37