Hydrogeochemical stratification of the unconfined Samobor aquifer (Zagreb,Croatia) |
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Authors: | Tatjana Vlahovi? Andrea Ba?ani Kristijan Posavec |
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Institution: | (1) Croatian Natural History Museum, Demetrova 1, 10000 Zagreb, Croatia;(2) Faculty of Mining, Geology and Petroleum Engineering, Department of Geology and Geological Engineering, University of Zagreb, Pierottijeva 6, 10000 Zagreb, Croatia |
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Abstract: | In the western part of the city of Zagreb, Croatia, hydrogeochemical and isotopic investigations of the Samobor aquifer were
carried out with the aim of determining the differences in hydrogeochemical characteristics at increasing aquifer depths.
The aquifer comprises 40-m thick gravelly–sandy deposits, with lenses and interlayers of silt and clay. The analyses have
proven that with increasing aquifer depth, there are decreases in groundwater temperature and the values of electrical conductivity
and increases in the sodium, iron and manganese concentrations. The δ13C distribution shows an evident increase in biogenic carbon concentrations with increasing aquifer depth. The measured specific
14C activities showed that the deeper part of the aquifer is characterized by slow water exchange, while the shallower part
is influenced by current recharge, although the pumping wells located on the well-field downstream penetrate the aquifer fully.
A direct exchange of water from the Sava River and groundwater occurs in the near vicinity of the river. This exchange weakens
further away, while the difference in hydrogeochemical characteristics between the Sava River water and groundwater increases. |
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Keywords: | Hydrogeochemical stratification Unconfined aquifer Zagreb Croatia |
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