3 research outputs found
Seafloor Map of the Alghero Bay (Sardinia, Italy)
No full text© 2020 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group on behalf of Journal of Maps. The Alghero Bay is a coastal area of high economic value because of the presence of one of the most popular beaches of Sardinia (San Giovanni, Maria Pia, Le Bombarde, Lazzaretto). The organisms living in the meadow of Posidonia oceanica, which densely cover the offshore areas of the bay, represent the most important source of sediments to these beaches. For this reason, a detailed mapping of the local seabed features and distribution of P. oceanica constitutes an important tool for the coastal managing of the area. The integrated use of several methodologies, such as Side Scan Sonar, Remote Operating Vehicle, Drone and direct sediment sampling has allowed us to realize a very detailed seafloor map of the Alghero Bay
Geomorphology of the northeast Sardinian continental shelf between Olbia and Posada (Italy)
No full textThe Geomorphologycal map of the continental shelf of the northeaster sector of the Sardinian coast has allowed the recognition of several seafloor features. These have been related to the geology and climate history of the area from the Last Glacial Maximum (LGM) to the early Holocene. During the LGM sea level was about 130 below the present and cuspate deltas fed by rivers crossing the continental shelf formed. The post LGM sea level rise caused submersion of the exposed continental shelf and changed the dominant sedimentary processes. The rise was not continuous but punctuated by stillstands during which suites of beach ridges developed. The mapped ridges (BRS1, BRS2 and BRS3) are correlated to specific post-LGM sea level stillstands. These fit pretty well with the cold phases that punctuated the post LGM warming phase; that is, the Older Dryas (17-15 ka), Younger Dryas (12.9-11.6 ka) and the 8.2-kiloyear event (8.7-8.2 ka)
