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We study how a coastal obstruction (peninsulaor coastal island) affects the three-dimensional barotropic currents inan oblong rectangular basin with variable bathymetry across the basin width. Thetransverse depth profile is asymmetric and the peninsula or island lies in themiddle of the long side of the rectangle. A semi-spectral model for theBoussinesq-approximated shallow water equations, developed in Haidvogel etal. and altered for semi-implicit numerical integration in time in Wang andHutter, is used to find the steady barotropic state circulation pattern toexternal winds. The structural (qualitative) rearrangements and quanti2tativefeatures of the current pattern are studied under four principal wind directionsand different lengths of the peninsula and its inclination relative to theshore. The essentially non-linear relationships of the water flux between thetwo sub-basins (formed by the obstructing peninsula) and the correspondingcross-sectional area left open are found and analysed. It is further analysedwhether the depth-integrated model, usually adopted by others, is meaningfulwhen applied to the water exchange problems. The flow through the channelnarrowing is quantitatively estimated and compared with the three-dimensionalresults. The dynamics of the vortex structure and the identification of theup-welling/down-welling zones around the obstruction are discussed in detail.The influence of the transformation of the peninsula into a coastal island onthe global basin circulation is considered as are the currents in the channel.The geometric and physical reasons for the anisotropy of the current structurewhich prevail through all obtained solutions are also discussed. Key words: Oceanography: general (limnology; numericalmodeling) - Oceanography: physical (currents

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