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UID:pretalx-flowpath-2025-LSZUNF@talks.staging.osgeo.org
DTSTART;TZID=CET:20250612T143000
DTEND;TZID=CET:20250612T144000
DESCRIPTION:The Po River plain is experiencing groundwater resources declin
 e since the last two decades\, due to diminished recharge rates and ground
 water overexploitation. Additionally\, the elevated anthropogenic pressure
 s increase the likelihood of groundwater contamination. For instance\, Bre
 scia with more than 200k citizens and a widespread industrial area\, hosts
  many potential sources of groundwater pollution. The managed aquifer rech
 arge (MAR) technique is well-known to mitigate groundwater contamination a
 nd to replenish groundwater resources\; although MAR could trigger unwante
 d redox reactions\, like pyrite oxidation\, that must be evaluated before 
 to establish a MAR scheme. To quantify possible interactions among recharg
 e waters and the aquifer\, 2 cores were drilled in a sub-urban area to cap
 ture the lithological variability of the unconfined aquifer. To delineate 
 redox gradients within the aquifer\, vertical profiles of sediment cores w
 ere collected via Rhizon® samplers and analysed for TDS\, pH\, DOC\, majo
 r ions\, and trace elements. In addition\, 3 batches with 160 g of sedimen
 t and 800 ml of deionized water were set-up and monitored for 3 months. Pr
 e- and post-experimental characterisation of mineral phases was done via s
 equential extraction (SE). Stratigraphical cores were similar but not homo
 geneous\, with the most permeable layers constituted by sandy gravel layer
 s. Depth profiles of selected species delineated possible pollution source
 s from urban leakage\, although below admissible limits. SE suggested a >5
 0%±25 increase of Fe-oxides at shallow depths\, while no significant incr
 ease at the base of the aquifer. The batches and SE demonstrated that no s
 ignificant release of heavy-metal(loid)s was induced by the recharging wat
 er and the already present contaminants were diluted below admissible limi
 ts. The proposed framework could be employed to assess the feasibility of 
 MAR to assist tailored design solutions.
DTSTAMP:20260427T201514Z
LOCATION:Room R3
SUMMARY:Quantification of driving redox reactions potentially induced by ma
 naged aquifer recharge in the suburban environment of Brescia (IT) - Nicol
 ò Colombani
URL:https://talks.staging.osgeo.org/flowpath-2025/talk/LSZUNF/
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