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



[1] 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.