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| Titel |
Fate of river Tiber discharge investigated through numerical simulation and satellite monitoring |
| VerfasserIn |
R. Inghilesi, L. Ottolenghi, A. Orasi, C. Pizzi, F. Bignami, R. Santoleri |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 8, no. 5 ; Nr. 8, no. 5 (2012-09-18), S.773-786 |
| Datensatznummer |
250005868
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| Publikation (Nr.) |
 copernicus.org/os-8-773-2012.pdf |
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| Zusammenfassung |
| The aim of this study was to determine the dispersion of passive pollutants
associated with the Tiber discharge into the Tyrrhenian Sea using numerical
marine dispersion models and satellite data. Numerical results obtained in
the simulation of realistic discharge episodes were compared with the
corresponding evolution of the spatial distributions of MODIS diffuse light
attenuation coefficient at 490 nm (K490), and the results were discussed
with reference to the local climate and the seasonal sub-regional circulation
regime. The numerical model used for the simulation of the sub-tidal
circulation was a Mediterranean sub-regional scale implementation of the
Princeton Ocean Model (POM), nested in the large-scale Mediterranean
Forecasting System. The nesting method enabled the model to be applied to
almost every area in the Mediterranean Sea and also to be used in seasons for
which imposing climatological boundary conditions would have been
questionable. Dynamical effects on coastal circulation and on water density
due to the Tiber discharge were additionally accounted for in the
oceanographic model by implementing the river estuary as a point source of a
buoyant jet. A Lagrangian particle dispersion model fed with the POM current
fields was then run in order to reproduce the effect of the turbulent
transport of passive tracers mixed in the plume with the coastal flow. Two
significant episodes of river discharge in both winter and summer conditions
were discussed in this paper. It was found that the winter regime was
characterized by the presence of a strong coastal jet flowing with the
ambient current. In summer the prevailing wind regime induced coastal
downwelling conditions, which tended to confine the riverine waters close to
the shore. In such conditions sudden wind reversals due to local weather
perturbations, causing moderate local upwelling, proved to be the only effective way
to disperse the tracers offshore, moving the plume from the coast and
detaching large pools of freshwater. |
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