This paper shows the results of “Bocche di Bonifacio” continental shelf mapping obtained by analyzing data collected during the oceanographic cruise "Bocche 2003" (Project “Geologia e geomorfologia terrestre e marina dell’insieme Corsica-Sardegna e della Toscana e applicazioni” - PIC- INTERREG III – Italia –Francia- Isole Sardegna – Corsica e Toscana, Asse 3 – Scambi transfrontalieri; Misura 3/1 scambi e cooperazione nel campo della ricerca). During the oceanographic cruise, performed aboard of the N \ O Universitatis, Multibeam, Side Scan Sonar and GeoChirp data were obtained. Moreover surface samples of mobile sediment, within depressions between -50 and -115 m, were collected. The analysis of both Side Scan Sonar sonograms mosaic and ultrasound paths, allowed us to perform a chronological and detailed mapping of various substrates highlighting the presence of complex bedforms associations. These bedforms associations are typical of continental shelf environment affected by high flow rate currents, both mono or bidirectional. Integrated digital data analysis associated to sedimentological study of sampled sediments, performed in a GIS environment, allowed to identify, in relation to the range time of the data acquisition, the directions of sediment movements on the seabed and the propagation sense of bedforms. Locally, it was found that the bedforms of mobile bottoms are still active and they persist for more than a decade. The path of currents circulation, during the acquisition data time, revealed the existence in the Bocche di Bonifacio channel of bottom currents flows westward, opposed to the prevailing flows of sea surface.
Dinamica sedimentaria dei fondali delle Bocche di Bonifacio (Sardegna settentrionale-Corsica meridionale)
PULIGA, GIUSEPPE;IBBA, ANGELO;ORRU', PAOLO EMANUELE
2010-01-01
Abstract
This paper shows the results of “Bocche di Bonifacio” continental shelf mapping obtained by analyzing data collected during the oceanographic cruise "Bocche 2003" (Project “Geologia e geomorfologia terrestre e marina dell’insieme Corsica-Sardegna e della Toscana e applicazioni” - PIC- INTERREG III – Italia –Francia- Isole Sardegna – Corsica e Toscana, Asse 3 – Scambi transfrontalieri; Misura 3/1 scambi e cooperazione nel campo della ricerca). During the oceanographic cruise, performed aboard of the N \ O Universitatis, Multibeam, Side Scan Sonar and GeoChirp data were obtained. Moreover surface samples of mobile sediment, within depressions between -50 and -115 m, were collected. The analysis of both Side Scan Sonar sonograms mosaic and ultrasound paths, allowed us to perform a chronological and detailed mapping of various substrates highlighting the presence of complex bedforms associations. These bedforms associations are typical of continental shelf environment affected by high flow rate currents, both mono or bidirectional. Integrated digital data analysis associated to sedimentological study of sampled sediments, performed in a GIS environment, allowed to identify, in relation to the range time of the data acquisition, the directions of sediment movements on the seabed and the propagation sense of bedforms. Locally, it was found that the bedforms of mobile bottoms are still active and they persist for more than a decade. The path of currents circulation, during the acquisition data time, revealed the existence in the Bocche di Bonifacio channel of bottom currents flows westward, opposed to the prevailing flows of sea surface.
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