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Barotropic wind-driven circulation patterns in a closed rectangular basin of variable depth influenced by a peninsula or an island

Chubarenko, Boris V. and Wang, Yongqi and Chubarenko, Irina P. and Hutter, Kolumban :
Barotropic wind-driven circulation patterns in a closed rectangular basin of variable depth influenced by a peninsula or an island.
[Online-Edition: http://www.ann-geophys.net/18/706/2000/angeo-18-706-2000.pdf]
In: Annales Geophysicae, 18 (6) pp. 706-727. ISSN 0992-7689
[Article] , (2000)

Official URL: http://www.ann-geophys.net/18/706/2000/angeo-18-706-2000.pdf

Abstract

We study how a coastal obstruction (peninsula or coastal island) affects the three-dimensional barotropic currents in an oblong rectangular basin with variable bathymetry across the basin width. The transverse depth profiele is asymmetric and the peninsula or island lies in the middle of the long side of the rectangle. A semi-spectral model for the Boussinesq-approximated shallow water equations, developed in Haidvogel et al. and altered for semi-implicit numerical integration in time in Wang and Hutter, is used to find the steady barotropic state circulation pattern to external winds. The structural (qualitative) rearrangements and quantitative features of the current pattern are studied under four principal wind is inclination relative to the shore. The essentially non-linear relationships of the water flux between the two sub-basins (formed by the obstructing penisula) and the corresponding crosssectional area left open are found and analysed. It is further analysed whather the depth- integrated model, usually adopted by others, is meaningful when applied to the water exchange problems. The flow through the challel narrowing is quantitatively estimmated and compared with the three- dimensional results. The dynamics of the vortex structure and the indentification of the up-welling/down-welling zones around the obsrruction are discussed in detail. The influence of the transformation of the penisula into a coastal islang on the gloabal basin circulation is considered as are the currents in the channel. The geometric and physical reasons for the anisotropy of the current structure which prevail through all obtained solutions are also discussed.

Item Type: Article
Erschienen: 2000
Creators: Chubarenko, Boris V. and Wang, Yongqi and Chubarenko, Irina P. and Hutter, Kolumban
Title: Barotropic wind-driven circulation patterns in a closed rectangular basin of variable depth influenced by a peninsula or an island
Language: English
Abstract:

We study how a coastal obstruction (peninsula or coastal island) affects the three-dimensional barotropic currents in an oblong rectangular basin with variable bathymetry across the basin width. The transverse depth profiele is asymmetric and the peninsula or island lies in the middle of the long side of the rectangle. A semi-spectral model for the Boussinesq-approximated shallow water equations, developed in Haidvogel et al. and altered for semi-implicit numerical integration in time in Wang and Hutter, is used to find the steady barotropic state circulation pattern to external winds. The structural (qualitative) rearrangements and quantitative features of the current pattern are studied under four principal wind is inclination relative to the shore. The essentially non-linear relationships of the water flux between the two sub-basins (formed by the obstructing penisula) and the corresponding crosssectional area left open are found and analysed. It is further analysed whather the depth- integrated model, usually adopted by others, is meaningful when applied to the water exchange problems. The flow through the challel narrowing is quantitatively estimmated and compared with the three- dimensional results. The dynamics of the vortex structure and the indentification of the up-welling/down-welling zones around the obsrruction are discussed in detail. The influence of the transformation of the penisula into a coastal islang on the gloabal basin circulation is considered as are the currents in the channel. The geometric and physical reasons for the anisotropy of the current structure which prevail through all obtained solutions are also discussed.

Journal or Publication Title: Annales Geophysicae
Volume: 18
Number: 6
Publisher: Springer
Uncontrolled Keywords: Oceanography: general (limnology; numerical modeling) - Oceanography: physical (currents)
Divisions: Study Areas
16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Fluid Dynamics (fdy)
Study Areas > Study Area Mechanic
Date Deposited: 23 Aug 2011 15:00
DOI: 10.1007/s00585-000-0706-6
Official URL: http://www.ann-geophys.net/18/706/2000/angeo-18-706-2000.pdf
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