4th International Submarine Canyon Symposium (INCISE2018)
5-7 November 2018, Shenzhen, CHINA
This is the detail of Numerical estimate of mixing rate due to internal tides generated by submarine canyons
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Numerical estimate of mixing rate due to internal tides generated by submarine canyons
Interaction between barotropic tides and concave-shape canyons generates internal tides. Nonlinear interaction or shear instability during internal tide generation and propagation cause local diapycnal mixing, which is one of the key processes to control sediment transport and suspension in deep ocean. A linear model, based on normal-mode decomposition, reveals complex beam generation and interaction inside the canyon. Then, a fully-nonlinear regional ocean model is employed to validate the linear model result and estimate energy dissipation during internal tide generation by different tidal forcing. Constant viscosity coefficients are chosen. The relationship between internal tide generation and topography resolution is analyzed using numerical experiments. Dissipated energy contributes to local mixing, so the mixing rate can be obtained through the numerical model. Its sensitivity to the viscosity coefficients is also discussed through comparisons with other advanced turbulence closure schemes such as MY2.5, KL10, etc. Using the estimated mixing rate, through incorporating a sediment transport model, we can investigate the resuspension and transport of sediments due to internal tides inside the canyon.
Session 1: Canyon processes in space and time (formation, evolution, circulation)