Premium
Tidally generated near‐resonant internal wave triads at a shelf break
Author(s) -
Lamb K. G.
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2007gl030825
Subject(s) - internal wave , amplitude , stratification (seeds) , triad (sociology) , internal tide , geology , nonlinear system , physics , mode (computer interface) , mechanics , geophysics , optics , seed dormancy , psychology , germination , botany , quantum mechanics , dormancy , computer science , psychoanalysis , biology , operating system
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.