BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//pretalx//talks.staging.osgeo.org//flowpath-2025//speaker//KJTXTC
BEGIN:VTIMEZONE
TZID:CET
BEGIN:STANDARD
DTSTART:20001029T040000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
TZNAME:CET
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:20000326T030000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3
TZNAME:CEST
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
UID:pretalx-flowpath-2025-MHU8DG@talks.staging.osgeo.org
DTSTART;TZID=CET:20250612T164000
DTEND;TZID=CET:20250612T165000
DESCRIPTION:The Piedmont Plain (NW Italy) is characterized by a shallow phr
 eatic aquifer\, overlying a deep confined/semiconfined aquifers\, the latt
 er are essential for the supply of drinking water. \nThe aim of this study
  was to analyze the trends (period 2000–2021) in the main physicochemica
 l parameters (electrolytic conductivity (EC)\, pH) and main ions (Ca\, Mg\
 , HCO3\, Na\, Cl\, NO3 and SO4) in 70 wells in the deep aquifers in order 
 to identify the ongoing processes. The temporal distribution of threshold 
 exceedances for the sum of pesticides was also evaluated. The interaction 
 with shallow aquifers was evaluated comparing the average concentrations f
 or the main ions between shallow and deep aquifers and evaluating the tren
 ds of the Saturation Index (SI) of calcite. Additionally\, the temporal tr
 ends of ion exchange (Ca+Mg/Na index) were evaluated to highlight the cont
 ribution from silty-clayey layers\, which represent the less permeable por
 tions of the deep aquifers.\nResults highlight relevant increasing trends 
 for EC\, Ca\, Mg and Cl in 57-69% of the monitored wells\, and increasing 
 trends for HCO3 and Na in 41-46% of the monitored points. Decreasing trend
 s exist for 3-10% of the monitored points. SO4\, NO3 and pH show heterogen
 eous trends. The sum of pesticides shows greater exceedances of the thresh
 old values in the most recent period compared to the previous one. The tem
 poral trends of ion exchanges reveal the presence of trends in 61% of moni
 tored wells.\nAverage concentrations in shallow aquifers show higher value
 s than in deep aquifers. The decreasing trends of Calcite SI confirm the i
 nteraction between aquifers.\nThese results suggest an increase in the flo
 ws from the shallow aquifers to the deep aquifers and an increased contrib
 ution from silty-clayey layers of the deep aquifers. These processes are c
 onsistent with excessive withdrawal from deep aquifers. \nIn conclusion\, 
 the existence of impacting and worrying processes at a regional scale were
  defined.
DTSTAMP:20260428T025537Z
LOCATION:Room R3
SUMMARY:Exchanges between deep and shallow aquifers  in the Piedmont Po Pla
 in (NW Italy): a hydrochemical approach with groundwater chemical trends a
 nalyses - Daniele Cocca
URL:https://talks.staging.osgeo.org/flowpath-2025/talk/MHU8DG/
END:VEVENT
END:VCALENDAR