Di Fiore, Vincenzo and Aiello, Gemma and D'Argenio , Bruno (2011) Gravity instabilities in the Dohrn canyon (Bay of Naples, Southern Tyrrhenian sea): potential wave and run-up (tsunami) reconstruction from a fossil submarine landslide. Geologica carpathica, 62 (1). pp. 55-63.
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Abstract
We discuss a mathematical model for wave and run-up generated submarine landslides in the canyons of the Bay of Naples (Magnaghi-Dohrn canyon system). The morpho-bathymetry and submarine gravity instabilities of such incisions have been investigated through the interpretation of a high resolution DEM. The canyons are located in a sector of the bay where there is a variable interaction of volcanic activity (Phlegrean Fields and Ischia and Procida islands) with sedimentary processes due to the Sarno-Sebeto rivers. At present the Naples canyon-system is inactive, as is shown by the Holocene sedimentary drapes deposited during the present sea-level highstand but gravity instabilities occurred in the recent past at the canyons' heads. In particular the Dohrn Canyon is characterized by a double regressive head, while the Magnaghi Canyon shows a trilobate head, formed by the junction of three main tributary channels and coincident with the retreat of the shelf break around the 140 m isobath. The results of a simulation of failures in the above source areas show that the amplitude of wave run-up, expressed in terms of sea floor depth percentage, may range up to 2.5% of the water depth at the sea bottom.
| Item Type: | Article |
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| Subjects: | 500 Scienze naturali e Matematica > 550 Scienze della Terra > 551 Geologia, Idrologia, Meteorologia > 551.4 Geomorfologia e idrosfera > 551.46 Idrosfera, Geologia sottomarina e Oceanografia (Classificare qui le acque marine, l'Idrografia, l'Oceanografia fisica; le opere interdisciplinari sulla Scienza del mare, sugli oceani e i mari) > 551.468 Geologia sottomarina (Classificare qui il fondo oceanico) > 551.4683 Geomorfologia sottomarina (Classificare qui la Topografia del fondo oceanico) |
| Depositing User: | Dr Gemma Aiello |
| Date Deposited: | 10 Jun 2011 09:44 |
| Last Modified: | 16 Jun 2011 13:17 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/3347 |
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