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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:20260427T122502Z
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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