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UID:pretalx-flowpath-2025-BABSWY@talks.staging.osgeo.org
DTSTART;TZID=CET:20250611T131000
DTEND;TZID=CET:20250611T132000
DESCRIPTION:The assessment of drought duration\, severity\, and its impact 
 on groundwater resources can be achieved through the integrated analysis o
 f climatic indices and groundwater level fluctuations. This study investig
 ates the effects of drought periods on groundwater within distinct sectors
  of the Castelporziano Estate aquifer. Utilizing data from two meteorologi
 cal stations and the Estate's piezometric monitoring network\, a comprehen
 sive analysis was conducted. The availability of extensive thermo-pluviome
 tric and piezometric records (1995-2024) facilitated the computation of th
 e Standardized Precipitation-Evapotranspiration Index (SPEI) and the Stand
 ardized Groundwater Index (SGI)\, enabling the evaluation of their variati
 ons over the past 30 years. \nPrior research has established the presence 
 of a main aquifer\, exhibiting seasonal fluctuations primarily driven by l
 ocal meteoric inputs\, with base flow sustained by contributions from the 
 regional aquifer. The Coastal and Central sectors\, mainly recharged by lo
 cal precipitation\, show a different decline in piezometric levels. Compar
 ative analysis of the SPEI calculated for two weather stations\, one situa
 ted along the coast and the other in the inland sector of the Estate\, rev
 ealed significant variations\, which prove decisive in the recharge proces
 ses of these sectors. The Coastal sector exhibited a consistent pattern of
  alternating wet and dry periods until 2016\, followed by a sustained drou
 ght period extending to 2023. These fluctuations are reflected in groundwa
 ter levels\, as evidenced by the SGI\, which has registered continuous neg
 ative values since 2016\, reaching its minimum values in 2024. In the Cent
 ral sector\, the SPEI indicates a protracted drought from 1999 to 2008\, r
 esulting in a persistent reduction of piezometric heads. Consistent negati
 ve SGI values since 2008 corroborate the enduring water deficit in this se
 ctor\, with a discernible exacerbation observed in the last three years\, 
 correlating with the SPEI trend.
DTSTAMP:20260427T201518Z
LOCATION:Room R3
SUMMARY:Assessing the effects of drought periods on the undeterred aquifer 
 of Castelporziano Natural Reserve (Rome\, Italy). - Chiara Sbarbati
URL:https://talks.staging.osgeo.org/flowpath-2025/talk/BABSWY/
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UID:pretalx-flowpath-2025-MSKAPR@talks.staging.osgeo.org
DTSTART;TZID=CET:20250612T093000
DTEND;TZID=CET:20250612T094000
DESCRIPTION:Low-permeability fractured rocks constitute the bedrock of many
  regions worldwide. Due to the extreme heterogeneity and anisotropy\, thes
 e rocks show very complex and varied drawdown-time trends when subjected t
 o pumping. Understanding these trends is crucial for operational decisions
 \, such as utilizing wells for water supply or managing dewatering operati
 ons in mining sites. This study examines nine pumping tests in an andesiti
 c bedrock formation. The tests were carried out in wells of varying depths
  (30 - 260 m) in a region where groundwater circulation is not always cont
 inuous in the network of discontinuities. The tests lasting between 9 and 
 68 hours were generally carried out at constant flow rate (0.4-6 L/s) with
  measurements of drawdown in the pumping well and\, in some cases\, in an 
 observation well. The drawdown data versus time have been analyzed through
  semi-log plots\, the smoothed time series’ have then been represented o
 n bi-log plots together with the first derivative of the drawdown. The tre
 nds of the drawdown and its derivative have been compared with theoretical
  curves\, and interpretation was refined using flow dimension sequence ana
 lysis. The results show very different responses of the aquifer to pumping
 \, which are affected by the interconnection of discontinuities\, the pres
 ence of multiple hierarchical networks of discontinuities and of dykes tha
 t bisects a country-rock aquifer. \nData from pumping tests was integrated
  by earth tides groundwater response from 6 piezometers and by additional 
 information deriving from RQD available for 400 boreholes to obtain a prob
 ability distribution of the hydraulic parameters to be used as prior infor
 mation in numerical modelling.
DTSTAMP:20260427T201518Z
LOCATION:Room R3
SUMMARY:Groundwater flow in fractured bedrock: prior information from pumpi
 ng tests\, RQD and Earth tides - Chiara Sbarbati
URL:https://talks.staging.osgeo.org/flowpath-2025/talk/MSKAPR/
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