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2002 LAPCOD Meeting
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A Lagrangian model for the dispersion of nutrients in coastal waters
Magaldi M. G., Doglioli A. M.
INFM-DIFI, University of Genova
magaldi@fisica.unige.it(Abstract received 10/28/2002 for session A)
ABSTRACT
A Lagrangian single particle model, LAMP3D (Lagrangian Assessment Marine Pollution three-dimensional model) aimed to study the dispersion of nutrients in coastal waters is presented. The purely random approximation is adopted, obtaining a random walk model. The well-known POM (Princeton Ocean Model) [Mellor, 1998] in barotropic approximation provides the depth averaged current velocity. From this field an Ekman transport based submodel embedded in the LAMP3D code is used to provide a simple parameterization of the action of the three-dimensional deterministic velocity field.
An application of the coupled model POM-LAMP3D to study the dispersion of wastes coming from a marine fish farm in the Ligurian Sea is presented. Estimates of the regional dispersion patterns of nitrogen, phosphorus and organic carbon was calculated using a three dimensional grid and compared to in situ experimental data. Result of the simulations clearly showed as dissolved particles tend to spread rapidly and undergoes rapid dilution depending on dominant wind and surface currents direction. In contrast sedimentable particles remain mainly confined in the fish farm area and readily sink to the bottom sediment.
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2002 LAPCOD Meeting, Key Largo, Florida, December 12-16, 2000