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Coherent structures in coastal flows
Philippe Fraunie
LSEET Universite Sud Toulon Var
fraunie@lseet.univ-tln.fr(Abstract received 02/25/2005 for session B)
ABSTRACT
Field and numerical modeling experiments in Rhone and Ebro regions of freshwater influence are analysed concerning suspended matter dispersion. Non linear interaction between up/downwellings, density and shelf background cirulation involve secondary vortices the size of the internal Rossby radius - a few kilometers - responsible for vertical mixing and retention. High order numerical schemes and turbulence models are shown necessary to reproduce such complex flows including density fronts. Optimal control techniques are used for turbulent Schmidt number optimization for Richardson numbers larger than one. Available satellite data are used to confirm occurnce of such small scale structures.
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2005 LAPCOD Meeting, Lerici, Italy, June 13-17, 2005