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UID:pretalx-flowpath-2025-HJPCWX@talks.staging.osgeo.org
DTSTART;TZID=CET:20250612T160000
DTEND;TZID=CET:20250612T163000
DESCRIPTION:As part of a complex geological-hydrogeological survey\, the ka
 rst system in Budapest and its surroundings has been investigated includin
 g its hydrogeochemical and isotopic characterisation. Additionally\, the a
 im of this work was to support the 3D hydrodynamic flow and heat transport
  modelling by interpreted hydrogeochemical data which could be used for th
 e verification of the models.\nThis karst system is characterised by the p
 resence of different flow systems\, from local to regional and with hypoge
 nic karst developments shaped by discharging thermal karst waters. Based o
 n major chemical parameters and outflowing water temperature we could dist
 inguish two main clusters. Wells and springs mainly west of the Danube (We
 stern group)\, contain mainly CaMgHCO3 type waters\, with higher sulphate 
 concentrations in the south. Wells and springs along the Danube and to the
  east (Eastern group)\, have higher water temperatures and TDS\, and in so
 me cases higher sodium and chloride concentrations\, which show the presen
 ce of regional flow systems.  The Western group could be further divided i
 nto 4\, while the Eastern group into 6 subclusters.\nBased on stable oxyge
 n and hydrogen isotope data the karst water is mainly of meteoritic origin
 \, although a very small brackish or seawater component cannot be excluded
 . Based on radiocarbon data the residence times of these karst waters are 
 at least 20 to 30 ka. The thermal component is of Pleistocene origin\, whi
 le the cold karst waters infiltrated during the Holocene. Some of the spri
 ngs and wells contain detectable tritium\, showing that these waters conta
 in a modern precipitation component detected in the cold karst waters and 
 in the discharge zones.\nAnalysis of groundwater samples from a recently f
 inished campaign including a wide range of stable and natural radioactive 
 isotopes will contribute to a better characterization of these karst water
 s enabling a better understanding of their mixing in the discharge zones.
DTSTAMP:20260427T221751Z
LOCATION:Room R3
SUMMARY:The role of hydrogeochemistry and isotopes in understanding the kar
 stic system in Budapest and its surroundings - Teodóra Szőcs
URL:https://talks.staging.osgeo.org/flowpath-2025/talk/HJPCWX/
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