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UID:pretalx-flowpath-2025-GCRB88@talks.staging.osgeo.org
DTSTART;TZID=CET:20250611T152000
DTEND;TZID=CET:20250611T153000
DESCRIPTION:Groundwater (GW) and surface waters (SW) salinization is affect
 ing coastal aquifers\, and this phenomenon\, exacerbated by climate change
  (CC)\, is altering water cycle in transitional coastal environments. To c
 ompare GW fluxes and salinity origins\, two coastal unconfined aquifers of
  Italy\, the lower Po River lowland and Volturno River\, were selected. A 
 density-dependent numerical model was realized (SEAWAT4.2) with the same g
 rid resolution (200x200m) and time steps (monthly\, 2010-2020)\, to enhanc
 e the comparison. The models allowed to quantify GW flow directions change
 s and salinity evolution and to compare GW and saline fluxes within the aq
 uifers. Both models were used to underpin SW-GW interactions and the CC im
 pact. Each model was calibrated versus GW heads observations and high-reso
 lution salinity profiles with good model performance. \nThe Po River aquif
 er simulation highlighted a salinity increase in the deeper aquifer layers
  due to increased upward GW fluxes triggered by decreased recharge rates a
 nd a “Polder” like situation. Shallow layers experienced both increasi
 ng and decreasing salinization trends depending on irrigation. The saliniz
 ation of the drainage network is increasing during the modelled period\, d
 espite the seasonal and interannual variability. \nThe Volturno aquifer si
 mulation highlighted an increasing GW salinization pattern due to seawater
  intrusion from the Volturno riverbed\, induced by the decreased discharge
  rate. This salinization mechanism is complicated by salt leaching from pe
 aty and silty-clay lenses deposited during the Late Holocene\, when the co
 astal area was an inner bay. \nThe model budget intercomparison suggested 
 that the classical mechanism of seawater wedge intrusion from the coastlin
 e is limited to the first km inland in both aquifers. While large inland p
 ortions of the model domains are characterized by high salinity due to rem
 nant paleo seawater in aquitards\, driving the GW salinity evolution and t
 he salinity exchange with SW.
DTSTAMP:20260427T221746Z
LOCATION:Room R3
SUMMARY:Cross comparison of groundwater fluxes and dissolved salts in the V
 olturno and Po River coastal aquifers via SEAWAT model budgets - Mattia Ga
 iolini
URL:https://talks.staging.osgeo.org/flowpath-2025/talk/GCRB88/
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