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Resonance of long waves generated by storms obliquely crossing shelf topography in a rotating ocean

Published online by Cambridge University Press:  07 July 2011

S. THIEBAUT  and
R. VENNELL
S. THIEBAUT*
Affiliation:
Ocean Physics Group, Department of Marine Science, University of Otago, Dunedin 9054, New Zealand
R. VENNELL
Affiliation:
Ocean Physics Group, Department of Marine Science, University of Otago, Dunedin 9054, New Zealand
*
†Email address for correspondence: thise135@student.otago.ac.nz
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Abstract

The oceanic forced wave beneath a moving atmospheric disturbance is amplified by Proudman resonance. When modified by the Earth's rotation this classical resonance only occurs if the disturbance time scale is smaller than the inertial period. With or without Coriolis effects, free transients generated by storm forced waves obliquely crossing step changes in water depth at particular angles are shown to resonate by exciting a range of long barotropic free waves. Rotationally influenced slow atmospherically forced waves crossing a vertical coast at a critical angle lead to a form of subcritical resonance, which occurs only when the component of the disturbances' phase velocities along the coast matches that of a free Kelvin wave (KW). In a rotating ocean, transients generated by disturbances crossing a step at a particular angle are shown to excite a free double Kelvin wave (DKW). This new type of resonance only occurs for sufficiently large steps and disturbances with time scale greater than the inertial period. A storm crossing a step shelf can result in the excitation of an infinite set of edge waves, a single KW, a unique DKW and a first-mode continental shelf wave, depending on the topography and the disturbance time scale, translation speed and incident angle. The study of resonances and wave mode excitations generated by storms crossing a coast or a continental shelf may contribute to understanding how a particular combination of the storm characteristics can result in destructive coastal events with time scales encompassing the typical meteotsunami period band (tens of minutes) and storm surges with periods of several hours or days.

JFM classification

Geophysical and Geological Flows: Topographic effects Geophysical and Geological Flows: Waves in rotating fluids

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Type
Papers
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Journal of Fluid Mechanics , Volume 682 , 10 September 2011 , pp. 261 - 288
Copyright
Copyright © Cambridge University Press 2011

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