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Second Symposium on Turbulence and Shear Flow Phenomena
June, 27-29, 2001, KTH, Stockholm, Sweden

DOI: 10.1615/TSFP2

THE EFFECTS OF COASTAL GEOMETRY ON TURBULENT MIXING IN UPWELLING FLOWS

pages 97-102
DOI: 10.1615/TSFP2.160
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Краткое описание

Upwelling is responsible for a large fraction of the mixing in the ocean and is important to the biological productivity. We study this process by solving the Navier-Stokes (N-S) equations in generalized curvilinear coordinates using the numerical model of Zang and Street (1995). The influence of coastal perturbations such as capes on the large-scale structures and mixing is investigated. The structure of the instabilities is found to be of mixed baroclinic-barotropic type (Tadepalli and Ferziger, 2001). Nonlinear interactions moderate the growth of the large scales and generate 'fish-hook' structures. The Rayleigh-Taylor and mixed instabilities and fish-hook structures cause a sharp increase in the mixing. The mixing and stirring are quantified using a mixedness parameter and energy budgets (Tseng and Ferziger, 2001). Coastal perturbations modify the coherent structures which travel in the windward direction. The latter are not phase-locked by the cape. The cape produces strong vortex stretching due to the acceleration of the flow around it. The continued vortex stretching eventually results in vortex tearing in the cape vicinity. This process causes greater stirring than in the no-cape flow.

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