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Propagation of barotropic vortices over topography in a rotating tank

Published online by Cambridge University Press:  26 April 2006

G. F. Carnevale ,
R. C. Kloosterziel  and
G. J. F. Van Heijst
G. F. Carnevale
Affiliation:
Scripps Institute of Oceanography, University of California, San Diego, La Jolla, CA 92093, USA
R. C. Kloosterziel
Affiliation:
Institute for Nonlinear Science (INLS), University of California, San Diego, La Jolla, CA 92093, USA
G. J. F. Van Heijst
Affiliation:
Department of Technical Physics, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
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Abstract

A small-scale cyclonic vortex in a relatively broad valley tends to climb up and out of the valley in a cyclonic spiral about the centre, and when over a relatively broad hill it tends to climb toward the top in an anticyclonic spiral around the peak. This phenomenon is examined here through two-dimensional numerical simulations and rotating-tank experiments. The basic mechanism involved is shown to be the same as that which accounts for the northwest propagation of cyclones on a β-plane. This inviscid nonlinear effect is also shown to be responsible for the observed translationary motion of barotropic vortices in a free-surface rotating tank. The behaviour of isolated vortices is contrasted with that of vortices with non-vanishing circulation.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 233 , December 1991 , pp. 119 - 139
Copyright
© 1991 Cambridge University Press

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