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A Small Scale Numerical Experiment of Lagrangian Mixing in a Tidally Driven, MID-Latitude Bottom Boundary Layer

Author(s): Lupieri Guido; Salon Stefano; Armenio Vincenzo

Linked Author(s): Vincenzo Armenio

Keywords: Turbulence; Lagrangian dispersion; Stokes boundary layer; Coriolis force

Abstract: The effect of rotation on the turbulent mixing affecting a swarm of Lagrangian particle in a tidally-forced mid-latitude shallow-water column is here investigated. The analysis is carried out numerically, using Large-Eddy simulation. The presence of the Coriolis force in the governing equations significantly increases the mixing efficiency, in comparison with the non-rotating case. Rotation extends the turbulent boundary layer up to the near-surface layer of the water column and strongly enhances the small-scale horizontal mixing in the whole water depth. The characteristics of the turbulent diffusion are discussed with the analysis of the evolution of the particles motions throughout the whole period of oscillation.

DOI:

Year: 2007

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