Journal article

Boundary mixing by density overturns in an internal tidal beam

B Gayen, S Sarkar

GEOPHYSICAL RESEARCH LETTERS | AMER GEOPHYSICAL UNION | Published : 2011

Abstract

A numerical study based on large eddy simulation (LES) is performed to investigate near-bottom mixing processes in an internal wave beam over a critical slope. Transition to turbulence from an initial laminar state is followed by mixing events that occur at specific phases. Maximum turbulent kinetic energy and dissipation rate are found just after the zero velocity point when flow reverses from downslope to upslope motion. At this phase, convective instability leads to density overturns that originate in the upper flank of the beam and span the beam width of 60 m. Turbulence originating at the bottom and with smaller vertical extent is also present during the phases of peak upslope and downs..

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University of Melbourne Researchers

Grants

Awarded by ONR


Funding Acknowledgements

We are pleased to acknowledge support through ONR N000140910287, program manager Terri Paluszkiewicz.