Journal
JOURNAL OF COASTAL CONSERVATION
Volume 22, Issue 5, Pages 989-999Publisher
SPRINGER
DOI: 10.1007/s11852-017-0549-x
Keywords
Submarine canyons; Slope failure; Tsunamigenic potential; Coastal retreat; Subsidence
Categories
Funding
- MaGIC (Marine Geohazards along the Italian Coasts) Project - DPC
- RITMARE (La Ricerca ITaliana per il MARE) Project - MIUR
- savemedcoasts EC project [ECHO/SUB/2016/742473/PREV16]
- Progetto di Ateneo of University Sapienza of Rome
- MIUR PRIN 2011-2013 National Research Programme Response of morphoclimatic system dynamics to global changes and related geomorphologic hazard
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The recent high-resolution multibeam bathymetry surveys around Lipari Island allowed to evidence several submarine canyons, whose head often cut back up to very shallow water and at a few tens of meters far from the coast. These canyons are mainly located in the eastern and southern side of the island and are characterized by an ongoing retrogressive (landward) erosion, that also controlled the shape and the evolution of the coastline. The canyon heads are formed by minor slide scars. By coupling slide scar morphometry and simple numerical model we have been able to roughly estimate the potential tsunami wave amplitudes generated by related slope failures. Moreover, the retrogressive erosion of canyon heads can be claimed as a cause of the enhanced subsidence reported in the last few thousand years in the eastern part of Lipari, where the main villages are located. Based on these evidence, we propose a first assessment of the coastal hazard due to marine retrogressive activity in the largest and most densely populated island of the Aeolian Archipelago.
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