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| Titel |
Impact of historical tsunamis on a sandy coastal barrier: an example from the northern Gargano coast, southern Italy |
| VerfasserIn |
F. Gianfreda, G. Mastronuzzi, P. Sansò |
| 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 ; 1, no. 4 ; Nr. 1, no. 4, S.213-219 |
| Datensatznummer |
250000226
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| Publikation (Nr.) |
 copernicus.org/nhess-1-213-2001.pdf |
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| Zusammenfassung |
| The Lesina
coastal barrier is characterized by the presence of three wide washover
fans. They were formed by three distinct tsunamis which struck the
northern coast of the Gargano Promontory (Apulia, Italy) during historical
times. A model for their formation is presented. It takes into account the
geomorphological data collected and some reports about the effect of
recent tsunamis on coastal barriers and beaches. Washover fans were
produced by tsunami waves which ran through coseismic cracks developed on
dune ridges shaping a narrow, straight and relatively deep trench which
constitutes the fan throat. Moreover, each tsunami event most likely
caused severe erosion of the coastal barrier, shaping erosive grooves
across the dune ridges, causing beach cliffs and causing the nourishment
of submarine offshore bars. After the tsunami, a phase of coastal barrier
recovery began, forming new dune ridges and closing washover fan throats.
Morphological, archeological and radiometric data indicate a pre-Roman age
for the oldest event, which was dated at 2430 years BP. The second tsunami
struck the Lesina coastal barrier with similar magnitude 1550 years BP; it
was caused by the strong earthquake that occurred at Gargano Promontory in
the year 493 AD as reported by a medieval sacred legend. The smallest and
more recent fan formed following the tsunami that hit the northern coast
of Gargano on 30 July 1627. |
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