Modeling The Saltwater Intrusion In
The Lowlying Catchment Of
The Southern Venice Lagoon, Italy
Author(s)
P. Teatini, M. Putti, C. Rorai, A. Mazzia, G. Gambolati,
L. Tosi & L. Carbognin
Abstract
The coastland surrounding the southern Venice Lagoon, Italy, is a precarious
environment subject to both natural changes and anthropogenic pressure. One
major environmental problem is the saltwater intrusion in shallow aquifers. The
salt contamination is generally the result of seawater encroachment, but
significant contributions can also be due to the water exchange between the bed
of the major rivers and the subsurface. In fact, the reduced freshwater discharges
that occur in the Brenta and Bacchiglione rivers during the dry periods allow the
saltwater to flow up from the river mouths for several kilometres. Saltwater
intrusion is enhanced by a land elevation well below the mean sea level and by
the presence of several ancient sandy fluvial ridges and buried paleo-channels,
crossing the farmland with a main direction from inland to the lagoon boundary,
that can act as preferential pathways for groundwater flow and solute transport. Using as input data a geological, geophysical, hydrological data set collected
southern Venice Lagoon. The model solves the coupled density dependent flow around the Casetta pumping station over 2004-2005, a numerical model has been
developed to investigate the saltwater intrusion process along the margin of the
and transport equations by a highly accurate numerical approach based on the
mixed hybrid finite element (MHFE) method and a combination of MHFE with
high resolution finite volumes (HRFV) for the discretization of the flow and
transport equations, respectively. A set of simulations has been initially carried
out to analyze the effect of the natural factors forcing the saltwater intrusion in
the coastal aquifer system. Preliminary results provide evidence of the strong
Keywords
saltwater intrusion, desertification, Venice coastland
Related Book
Other papers in this volume
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