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Open AccessArticle

Application of Stable Water Isotopes to Improve Conceptual Model of Alluvial Aquifer in the Varaždin Area

1
Croatian Geological Survey, 10 000 Zagreb, Croatia
2
Meteorological and Hydrological Service, 10 000 Zagreb, Croatia
*
Author to whom correspondence should be addressed.
Water 2020, 12(2), 379; https://doi.org/10.3390/w12020379
Received: 9 December 2019 / Revised: 27 January 2020 / Accepted: 28 January 2020 / Published: 30 January 2020
(This article belongs to the Special Issue Use of Water Stable Isotopes in Hydrological Process)
To understand groundwater flow and geochemical processes within an aquifer, it is necessary to set up a conceptual model of the aquifer. To accomplish this, different methods are used, and one of them is an isotopic technique. The study area is located in the Varaždin area (NW Croatia). The aquifer represents the main source of potable water for the town of Varaždin and the surrounding settlements. The conceptual model of the alluvial aquifer has to be set up prior to creating a groundwater flow and transport model. Measurements of ratios δ18Ο and δ2H in ground- and surface waters and precipitation samples were carried out. The relationship between ratios δ18Ο, δ2H, and d-excess for local precipitation in the study area showed that precipitation originates from the Atlantic air masses, although during the colder periods of the year, influence of the Mediterranean air masses was not negligible. The monitored period was warmer and wetter than average. Evaporation was observed at all monitored surface waters, but the largest rate was at the location of a gravel pit in Šijanec. The isotopic composition of the precipitation and groundwater showed a good correlation due to the isotopic homogenization of groundwater along the flow path. View Full-Text
Keywords: stable isotopes; deuterium and oxygen-18; hydrogeological conceptual model; alluvial aquifer; Varaždin area stable isotopes; deuterium and oxygen-18; hydrogeological conceptual model; alluvial aquifer; Varaždin area
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Marković, T.; Karlović, I.; Perčec Tadić, M.; Larva, O. Application of Stable Water Isotopes to Improve Conceptual Model of Alluvial Aquifer in the Varaždin Area. Water 2020, 12, 379.

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