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Shallow water sea-floor morphologies around Asinara Island (NW Sardinia, Italy)

Donda, Federica and Gordini, Emiliano and Rebesco, Michele and Pascucci, Vincenzo and Fontolan, Giorgio and Lazzari, Paolo and Mosetti, Renzo (2008) Shallow water sea-floor morphologies around Asinara Island (NW Sardinia, Italy). Continental Shelf Research, Vol. 28 (18), p. 2550-2564. ISSN 0278-4343. Article.

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DOI: 10.1016/j.csr.2008.07.003


Side scan sonar, high-resolution seismic and multibeam data collected off the coast of Asinara Island in the northernmost part of Sardinia have revealed the occurrence of four distinct acoustical patterns that can be related to four main sea-bed types. The four facies represent fine sand (Type A), medium to coarse sand (Type B), patchy sand cover between basement outcrops (Type C) and a predominantly sandy sea-floor colonized by the seagrass Posidonia Oceanica (Type P). The distribution of the sea-bed types indicates that the study area is characterized by a rather complex morphological setting. A remarkable physiographic difference exists between the eastern and western sector of the island, with the latter being affected by strong, westerly winds, mainly the so-called “Mistral”. The wave climate in this area is dominated by wind waves, which can reach a maximum height of 8 m during winter storms. Sediments are mobilized at water depths greater than 30 m from the sea surface during these energetic oceanographic regimes. We infer that dune fields and sand ribbons are deposited by strong offshore flows along the sea-bed resulting as a consequence of wave- and wind-induced onshore water transport.

Item Type:Article
ID Code:1356
Uncontrolled Keywords:Northwestern Sardinia, side scan sonar, high-resolution seismic, sea-floor bedforms
Subjects:Area 04 - Scienze della terra > GEO/02 Geologia stratigrafica e sedimentologica
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze botaniche, ecologiche e geologiche
Deposited On:18 Aug 2009 10:04

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