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Titolo:
Internal solitary waves in a structured thermocline with implications for resuspension and the formation of thin particle-laden layers
Autore:
Wang, BJ; Bogucki, DJ; Redekopp, LG;
Indirizzi:
Univ So Calif, Dept Aeronaut & Mech Engn, Los Angeles, CA 90089 USA Univ So Calif Los Angeles CA USA 90089 ch Engn, Los Angeles, CA 90089 USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
fascicolo: C5, volume: 106, anno: 2001,
pagine: 9565 - 9585
SICI:
0148-0227(20010515)106:C5<9565:ISWIAS>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
FINITE REYNOLDS-NUMBER; SEDIMENT RESUSPENSION; UNSTEADY DRAG; SPHERE; FLOW; TRANSPORT; BREAKING; EQUATION; MOTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Wang, BJ Univ So Calif, Dept Aeronaut & Mech Engn, Los Angeles, CA 90089 USA Univ So Calif Los Angeles CA USA 90089 Los Angeles, CA 90089 USA
Citazione:
B.J. Wang et al., "Internal solitary waves in a structured thermocline with implications for resuspension and the formation of thin particle-laden layers", J GEO RES-O, 106(C5), 2001, pp. 9565-9585

Abstract

A structured thermocline model is employed to elucidate the role of environmental factors in the characteristics of internal solitary waves, including the related implications for wave-induced resuspension and the formation of thin layers with enhanced concentration of passive particles. The model considers varying relative strengths between a thin seasonal thermocline and a broad permanent thermocline together with a sheared current in the upper mixed layer. The influence of these environmental factors on the stimulusof the benthic boundary layer under the footprint of solitary waves is assessed, particularly the potential for inducing boundary layer separation and lowering the near-bottom Richardson number. Also, the flow field associated with an internal solitary wave is shown not only to transport particles horizontally, but to create a tendency for passive particles located in themixed layer to migrate Vertically and concentrate in a thin layer. This latter effect is especially pronounced for particles that are heavier than the host fluid and have particle Reynolds numbers of order unity or greater. Although specific calculations for bubbles have not been included here, thenet vertical displacement for light particles following the passage of a solitary wave may be quite large.

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Documento generato il 23/01/20 alle ore 12:30:29