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\section{Adriatic Sea morphology and bathymetry}  The Adriatic Sea is a latitudinally elongated continental basin, with length and width of 800 km and 180 km respectively and with its major axis oriented along the northwest–southeast direction. It is located in the central Mediterranean, between the Appennines chain and the Balkans and is connected to the Ionian Sea by the 74 km wide Otranto strait.  Marked morphological differences characterize the basin along its longitudinal transversal axes. Accordingly the Adriatic Sea can be divided into three sub-basins (Artegiani et al., 1996).  The northern sub-basin is characterized by a shallow average depth of \~ 35 m with a very weak bathymetric gradient toward south-east where the 100 m bathymetric line is met in front of Giulianova (Italy). Po and the other northern Italian rivers contribute to a strong river runoff (\~ 3000 m3 s-1) and are believed to be the source of about 20\% of the total Mediterranean river runoff (Hopkins, 1992).  The middle Adriatic is a transition zone between the northern and the southern sub-basin and is charcterized by fairly open sea conditions. The average depth of the middle sub-basin is \~ 140 m with the two Pomo Depressions reaching \~ 270 m. This central zone spans from the 100 m contour to the Pelagosa sill (about 170 m depth), located around the line con- necting Vieste and Split. It is characterised by two depressions, the Pomo (or Jabuka) Pits, having a maximum depth of about 270 m.