Stable and unstable barotropic shelf waves in a coastal current
作者:
I.L. Collings,
R. Grimshaw,
期刊:
Geophysical & Astrophysical Fluid Dynamics
(Taylor Available online 1984)
卷期:
Volume 29,
issue 1-4
页码: 179-220
ISSN:0309-1929
年代: 1984
DOI:10.1080/03091928408248189
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
We consider the linearized stability of a barotropic coastal current flowing parallel to a straight coastline over a continental shelf and slope whose depth varies monotonically with distance from the coast. Some necessary conditions for stability and various semi-circle theorems are reviewed for general current profiles and bottom topography. A criterion for topography to be a destabilizing influence is derived. Some general results for stable waves are also described. Analytic solutions are obtained for a piece-wise linear current profile and the exponential depth profile (Buchwald and Adams, 1968). Dispersion diagrams are obtained for a monotonic current profile, where it is shown that the effect of topography is destabilizing, and for a triangular current profile. The dispersion diagrams generally contain a finite number (usually one or two) of unstable waves, and a set of stable waves, which may be infinite in number. The results are applied to some specific coastal regimes.
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