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A numerical study of quasi-geostrophic flow over isolated topography

Published online by Cambridge University Press:  20 April 2006

J. Verron  and
C. Le Provost
J. Verron
Affiliation:
Institut de Mécanique de Grenoble, Grenoble
C. Le Provost
Affiliation:
Institut de Mécanique de Grenoble, Grenoble
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Abstract

An extensive set of numerical simulations is performed to synthesize the behaviour of a barotropic flow over isolated topography on an f-plane and on a β-plane. The model is based on the quasi-geostrophic vorticity equation, where the dissipation terms have been retained. The use of open boundary conditions. following the method described by Orlanski (1976), allows detailed simulation of time-dependent flows over long periods.

On the f-plane, the ultimate solution is always characterized by a typical vorticity field with an anticyclonic vortex trapped over the topography, but different transient regimes occur, related to the importance of advection versus topography effect: direct advection of the positive vortex for strong flows; eddy interactions and double-vortex-structure appearance for weaker flows; oscillatory regimes with topographic trapped-waves generation for very strong vorticity-interaction cases.

On the β-plane, and for prograde flows, the situation is complicated by a Rossby wave pattern extending mainly downstream but also having an upstream component corresponding to zonal waves. For retrograde flows the obstacle does not excite Rossby waves but a transient response with zonal waves whose lifetime depends on the nonlinearity.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 154 , May 1985 , pp. 231 - 252
Copyright
© 1985 Cambridge University Press

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