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Groundwater freshening following coastal progradation and land reclamation of the Po Plain, Italy

Hydrogeology journal, 2015-08, Vol.23 (5), p.1009-1026 [Peer Reviewed Journal]

Springer-Verlag Berlin Heidelberg 2015 ;ISSN: 1431-2174 ;EISSN: 1435-0157 ;DOI: 10.1007/s10040-015-1263-0

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  • Title:
    Groundwater freshening following coastal progradation and land reclamation of the Po Plain, Italy
  • Author: Antonellini, M. ; Allen, D. M. ; Mollema, P. N. ; Capo, D. ; Greggio, N.
  • Subjects: Aquatic Pollution ; Aquifers ; Coastal ; Coastal plains ; Drains ; Earth and Environmental Science ; Earth Sciences ; Freshwaters ; Geology ; Geophysics/Geodesy ; Groundwater ; Groundwater flow ; Hydrogeology ; Hydrology/Water Resources ; Land reclamation ; Lenses ; Sea water ; Waste Water Technology ; Water Management ; Water Pollution Control ; Water Quality/Water Pollution
  • Is Part Of: Hydrogeology journal, 2015-08, Vol.23 (5), p.1009-1026
  • Description: Many coastal areas historically were inundated by seawater, but have since undergone land reclamation to enable settlements and farming. This study focuses on the coastal unconfined aquifer in the Po Plain near Ravenna, Italy. Freshwater is present as isolated thin (1–5 m) lenses on top of brackish to saline water. Historical maps show large areas of sea inundation until approximately 150–200 years ago when coastal progradation and construction of the drainage canals began. Since then, the aquifer has been freshening from recharge. A three-dimensional SEAWAT model is used to simulate a 200-year freshening history, starting with a model domain that is saturated with seawater, and applying recharge across the top model layer. Calibration to the observed concentrations for discrete depths within many monitoring wells is remarkably good. The current distribution of freshwater is largely controlled by the drainage network. Within and adjacent to the drains, the groundwater has high salinity due to up-coning of salt water. Between drains, the surface layers of the aquifer are fresh due to the flushing action of recharge. The modeling results are consistent with cation exchange processes revealed in the groundwater chemistry and with freshwater lenses identified in electrical resistivity soundings.
  • Publisher: Berlin/Heidelberg: Springer Berlin Heidelberg
  • Language: English
  • Identifier: ISSN: 1431-2174
    EISSN: 1435-0157
    DOI: 10.1007/s10040-015-1263-0
  • Source: ProQuest Central
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