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Turbulent coherent structures near c...

Magaldi, Marcello G.

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Turbulent coherent structures near coastal capes.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Turbulent coherent structures near coastal capes./
Author:	Magaldi, Marcello G.
Description:	117 p.
Notes:	Source: Dissertation Abstracts International, Volume: 70-05, Section: B, page: 2793.
Contained By:	Dissertation Abstracts International70-05B.
Subject:	Physical Oceanography. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3358230
ISBN:	9781109172447

Turbulent coherent structures near coastal capes.
Magaldi, Marcello G.

Turbulent coherent structures near coastal capes. - 117 p.

Source: Dissertation Abstracts International, Volume: 70-05, Section: B, page: 2793.

Thesis (Ph.D.)--University of Miami, 2009.

A numerical study aimed at investigating the conditions under which different flow regimes appear near coastal capes is presented. The impacts of the regimes are also quantified in terms of integral quantities like mixing, current transport and form drag. Idealized and realistic numerical simulations are run both in barotropically and baroclinically-driven systems. The realistic cases model the Western Adriatic Current (WAC) in the Adriatic Sea. In both cases, the turbulent state of the flow is controlled in first approximation by the Burger number, Bu.

ISBN: 9781109172447Subjects--Topical Terms:

1019163
Physical Oceanography.

Turbulent coherent structures near coastal capes.
LDR:03103nam 2200301 4500 001 1397041
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008 130515s2009 ||||||||||||||||| ||eng d
020 $a 9781109172447
035 $a (UMI)AAI3358230
035 $a AAI3358230
040 $a UMI $c UMI
100 1 $a Magaldi, Marcello G. $3 1675853
245 1 0 $a Turbulent coherent structures near coastal capes.
300 $a 117 p.
500 $a Source: Dissertation Abstracts International, Volume: 70-05, Section: B, page: 2793.
500 $a Adviser: Tamay M. Ozgokmen.
502 $a Thesis (Ph.D.)--University of Miami, 2009.
520 $a A numerical study aimed at investigating the conditions under which different flow regimes appear near coastal capes is presented. The impacts of the regimes are also quantified in terms of integral quantities like mixing, current transport and form drag. Idealized and realistic numerical simulations are run both in barotropically and baroclinically-driven systems. The realistic cases model the Western Adriatic Current (WAC) in the Adriatic Sea. In both cases, the turbulent state of the flow is controlled in first approximation by the Burger number, Bu.
520 $a When a steady barotropic and geostrophic current impinges on a triangular idealized cape, vertical movements are strong for Bu < 0.1 and pronounced lee waves can be found downstream of the obstacle. For 0.1 ≤ Bu < 1, fluid parcels flow more around the obstacle than over it. Flow separation occurs and small tip eddies start to shed. For Bu ≥ 1, tip eddies merge to form larger eddies in the lee of the cape. Flow regimes are also strongly dependent on the obstacle slope alpha when Bu ≥ 1. Flow regime diagrams in the Bu--alpha space are determined.
520 $a A baroclinic current as the WAC becomes unstable in absence of wind as it separates from the coast for the presence of capes along its path. Downwelling favorable winds narrow and thicken the coastal buoyant current, raising Bu above a critical value and suppressing baroclinic instabilities. Upwelling favorable winds enhance instabilities via the opposite mechanism. With downwelling winds waters mix but remain relatively fresh (S ≤ 38), while most of the freshwater signal is lost with upwelling winds. The along-shore transport increases with downwelling winds while it decreases and can even reverse with upwelling winds.
520 $a The form drag calculated across the obstacles in the different simulations is at least twice the magnitude of skin friction. In barotropic conditions it increases with increasing Bu and decreasing alpha and an empirical parametrization in the Bu--alpha space is put forth. Across the Gargano Promontory, more symmetric pressure fields are observed with downwelling winds; the form drag decreases as a result. The opposite is registered with upwelling winds.
590 $a School code: 0125.
650 4 $a Physical Oceanography. $3 1019163
690 $a 0415
710 2 $a University of Miami. $3 1017483
773 0 $t Dissertation Abstracts International $g 70-05B.
790 1 0 $a Ozgokmen, Tamay M., $e advisor
790 $a 0125
791 $a Ph.D.
792 $a 2009
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3358230