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| Titel |
Sediment transport and deposition during extreme sea storm events at the Salerno Bay (Tyrrhenian Sea): comparison of field data with numerical model results |
| VerfasserIn |
F. Budillon, D. Vicinanza, V. Ferrante, M. Iorio |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 6, no. 5 ; Nr. 6, no. 5 (2006-09-25), S.839-852 |
| Datensatznummer |
250003717
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| Publikation (Nr.) |
 copernicus.org/nhess-6-839-2006.pdf |
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| Zusammenfassung |
| Seismic stratigraphy and core litho-stratigraphy in the Salerno Bay inner
shelf (Southern Tyrrhenian Sea) reveal significant storm deposition
episodes over the last 1 ky. Three major events are preserved as decimetre
thick silt/sand layers bounded at their base by erosional surfaces and sealed
in the muddy marine sequences between 25 and 60 m of depth. Geochronology and
chrono-stratigraphy on core sediment point towards a recurrence of major sea
storms between 0.1 and 0.3 ky and put the last significant event in the
19th century, when no local meteorological time series is
available. A modelling of extreme sea-storms with a return period of about
0.1 ky is here proposed based on historical hindcast and aims at explaining
the occurrence of such unusual deep and thick sand deposits in the northern
sector of the bay. Results highlight the vulnerability of the northern coast
of the Salerno Bay to the south western sea storms which can drive waves up
to about 8 m high and wave period of about 13 s. With these conditions an
intense combined flow current is formed and might account for winnowing fine
sand down to the depth of 40 m at least. The numerical model thus confirms a
possible sand transport in the bottom boundary layer due to wave-current interaction
and could corroborate the interpretation of the most recent sand
layers, included in the cores, as being generated under extreme sea storm
conditions. |
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