Le contrôle de l’érosion dans les systèmes barrière-lagune: le champ dunaire de Capo Comino (Sardaigne nord-orientale, Italie) = The erosion of the barrier system of Capo Comino (North-East Sardinia, Italy)

The study of the delicate balances of the coasts has a crescent interest in the scientific and administrative communities because of the role of the coastal systems in the economic development. Indeed, during the 70s the littoral zone underwent to the strong urban development and tourist industry. Now the main need is to find an equilibrium between the necessities of the protection of the coastal environment and the human needs (ICZM Protocols), following the target of the preservation of the beaches and the coastal systems. The coast of Capo Comino, located in the north-eastern coast of Sardinia and partially included into a Zone of Community Interest ( SIC-ITB020012), is not influenced by human impact. The analysis of aerial photos allowed the study of the evolution of the coastline, the dune field and its vegetation between 1954 and the 2006. The field monitoring of the dunes (2003-2011) was also made by transects, in order to evaluate the morpho-sedimentological and vegetation dynamic of this sector. The data presented in this paper allow to understand that the erosion of the area is not strong and the regradation of the coastline is about 10-15 meters in the northern sector and 40 meters in the central one. The migration of the dunes, instead, is very important, with the mouvement of huge volumes of sand. The number and areas of the blowouts has increased too.