Lagrangian models of dispersion in marine environment |
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Authors: | Paolo Monti Giovanni Leuzzi |
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Institution: | 1.Dipartimento di Idraulica Trasporti e Strade,“Sapienza” Università di Roma,Rome,Italy |
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Abstract: | Turbulent dispersion can be studied successfully by using Lagrangian particle models. In general, the prediction of correct
concentration fields is a complex issue when the turbulent field is inhomogeneous and non-stationary. Two classes of Lagrangian
dispersion models have been considered in this work, which are based on the Wiener process and the so called “well-mixed”
criterion. In order to test the performances of these models and shed light on the underlying physical processes and modeling
assumptions, four different numerical models have been compared and tested by means of their long time behavior by considering
several study cases concerning idealized marine environment. Furthermore, the coupling of the community model Princeton Ocean
Model (POM) with the Lagrangian model LASEMOD (LAgrangian SEa MODel) is used to investigate the temporal and spatial evolution
of a passive pollutant released in the vicinity of the coast in the Tyrrhenian Sea basin. The simulation shows with reasonable
accuracy the time evolution of both the hydrodynamic and the concentration fields and provides a useful insight into the evaluation
of the environmental impact of pollutant releases along the coast. |
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