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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:20260428T165436Z
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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UID:pretalx-flowpath-2025-VAUKP3@talks.staging.osgeo.org
DTSTART;TZID=CET:20250612T134000
DTEND;TZID=CET:20250612T135000
DESCRIPTION:Upward saline groundwater (GW) seepage is provoking surface wat
 er (SW) canals to be salinized in a large\, reclaimed area of Po River low
 land (Italy)\, particularly in tile drained agricultural fields embodying 
 shortcuts among SW and shallow GW bodies. To identify salinization causes\
 , a continuous monitoring network of SW channels\, saturated and vadose zo
 ne (VZ) was established in two adjacent agricultural fields: the A1 field 
 plot\, mildly saline cultivated with maize and crossed by a paleochannel\;
  and the A2 field plot\, saline\, uncultivated and covered by salt toleran
 t weeds. \nThe VZ continuous monitoring allowed to identify capillary rise
  as major driver of soil salinity in A1 field\; in A2 additional salt is r
 eleased by roots decomposition after the mow. These findings were integrat
 ed with remote sensing data on vegetation health (SAVI) and water requirem
 ent (NDMI). \nPiezometers and drainage ditch continuous monitoring allowed
  to identify SW-GW relationships and saline sources in the aquifer/aquitar
 d lenses. \nFrequency domain analysis highlighted internal salinity dynami
 cs\, such as increased porewater salinity after mowing salt tolerant veget
 ation that increased temporary the EC up to 20 mS/cm. \nFinally\, measurem
 ents of water discharge and salt concentration at the outlet enabled a rel
 iable estimation of salt fluxes from tile drained agricultural fields\, sh
 owing that 70% of the total annual salt export (21±1.9 t/ha/yr) occurred 
 during sub irrigation periods. \nThe upward saline flux from GW\, together
  with the presence of halophilic vegetation fragments that slowly release 
 salts into porewater and help to maintain elevated concentrations in GW an
 d SW\, pose a serious threat for the SW resources that are used for irriga
 tion in these reclaimed lands\, especially considering the ongoing climati
 c change that are already stressing the Po River lowland.
DTSTAMP:20260428T165436Z
LOCATION:Room R3
SUMMARY:Salt migration and export via subsurface irrigation in a saline rec
 laimed landscape of the Po River lowland (Italy) - Mattia Gaiolini
URL:https://talks.staging.osgeo.org/flowpath-2025/talk/VAUKP3/
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