The Impact Of Relative Sea Level Rise On The
Northern Adriatic Sea Coast, Italy
Author(s)
L. Carbognin, P. Teatini & L. Tosi
Abstract
The lowlying coast of the Northern Adriatic Sea, between the Venetian territory
to the north and the Ravenna area to the south, is very sensitive to land and sea
elevation changes. Subsidence assessments show that geological land subsidence
has and continues to occur unevenly at different rates (from less than 1 to more
than 5 mm/yr), ascribable primarily to sediment compaction and secondly to
deformation of substratum. Anthropogenic subsidence, mainly due to groundfluid
removal, has severely occurred in the second half of 1900 reaching values
of some centimetres in the Venice area and a few meters southward. Starting in
the 1970s, however, with the halt of groundwater withdrawals, anthropogenic
subsidence has been strongly reduced or stopped. The availability of tide gauge
data in Trieste, Venice, and Ravenna, along the Northern Adriatic coast, allows
accurate assessment and meaningful observations of sea level changes. The
analysis of data recorded from 1890 to 2007 shows negative trends of relative
sea level equal to 1.2 mm/yr in Trieste, 2.5mm/year in Venice, and 8.5 mm/yr in
Ravenna. Since Trieste is known to be stable, the rate of 1.2 mm/yr is
attributable to the eustatic rise only. The comparison between Trieste and the
other two cities shows that the trend at Venice and Ravenna is significantly
influenced by land subsidence that is responsible for about the 57% and 85%,
respectively, of the recorded relative sea/ground elevation changes. The relative
sea level rise has induced modifications in geomorphologic and ecological
features of the entire coast.
Keywords: Northern Adriatic coast, geomorphologic features, sea level rise,
land subsidence, environmental impact, flooding.
Keywords
Northern Adriatic coast, geomorphologic features, sea level rise,
land subsidence, environmental impact, flooding
Related Book
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