Tidally generated near-resonant internal wave triads at a shelf break

Numerical simulations of internal wave generation by tidal flow over a shelf break using a linear background stratification show the presence of near‐resonant internal wave triads with spatially modulated amplitudes propagating away from the shelf break. The near‐resonant triad is comprised of mode‐...

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Bibliographic Details
Published in:Geophysical research letters 2007-09, Vol.34 (18), p.n/a
Main Author: Lamb, K. G.
Format: Article
Language:English
Subjects:
Earth sciences
Earth, ocean, space
Exact sciences and technology
internal waves
resonant triads
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Summary:Numerical simulations of internal wave generation by tidal flow over a shelf break using a linear background stratification show the presence of near‐resonant internal wave triads with spatially modulated amplitudes propagating away from the shelf break. The near‐resonant triad is comprised of mode‐one and ‐three waves of tidal frequency, which are directly forced by the tide‐topography interaction, and a second harmonic, mode‐two wave generated by the nonlinear interaction of these waves. A theory for these near‐resonant triads is presented and compared with the numerical simulations.
ISSN:0094-8276
1944-8007
DOI:10.1029/2007GL030825