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Isobath variation and trapping of continental shelf waves

Kaoullas, G; Johnson, ER; (2012) Isobath variation and trapping of continental shelf waves. Journal of Fluid Mechanics , 700 pp. 283-303. 10.1017/jfm.2012.153. Green open access

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Abstract

Since Trösch (Proceedings of the 4th International Conference on Applied Numerical Modeling, Tainan, Taiwan, 1984 (ed. H. M. Hsia, Y. L. Chou, S. Y. Wang & S. J. Hsieh) Science and Technology Series, vol. 63, 1986, pp. 307–311. American Astronautical Society) found trapped sub-inertial oscillations in computations of low-frequency variability in the Lake of Lugano, models of trapping have generally considered evenly spaced isobaths parallel to shorelines with approximate boundary conditions at any shelf–ocean boundary. Here an asymptotic analysis for slowly varying topography and accurate spectral computations demonstrate trapping on non-rectilinear shelves. It is shown that changes in any of three factors, isobath curvature, distance from the coast and the shelf-break, and the slope at the shelf-break, are sufficient on their own to give trapping. Continental shelves that abut smoothly onto the open ocean are considered thus avoiding the shelf–ocean boundary condition approximation and allowing the accuracy of previous approximations to be assessed.

Type: Article
Title: Isobath variation and trapping of continental shelf waves
Open access status: An open access version is available from UCL Discovery
DOI: 10.1017/jfm.2012.153
Publisher version: http://dx.doi.org/10.1017/jfm.2012.153
Language: English
Additional information: Copyright © Cambridge University Press 2012.
Keywords: geophysical and geological flows, shallow water flows, topographic effects
UCL classification: UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Maths and Physical Sciences
URI: http://discovery.ucl.ac.uk/id/eprint/1349059
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