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You are here: Home » Latest Issue » Volume 12, 2017 - Number 2 » STABLE ISOTOPE HYDROLOGY OF PRECIPITATION AND GROUNDWATER OF A REGION WITH HIGH CONTINENTALITY, SOUTH CARPATHIANS, ROMANIA


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Ana-Voica BOJAR1,2, Stanisław HALAS3, Hans-Peter BOJAR2 & Stanisław CHMIEL4
1Department of Geography and Geology, Salzburg University, Hellbrunnerstraße 34, A-5020 Salzburg and Department of Mineralogy, ana-voica.bojar@sbg.ac.at
2Studienzentrum Naturkunde, Universalmuseum Joanneum, Weinzöttlstraße 16, A-8045 Graz, Austria.
3Mass Spectrometry Laboratory, Institute of Physics, UMCS, 20-031 Lublin, Poland.
4Faculty of Earth Sciences and Spatial Management, Maria Curie-Skłodowska University, ul. Kraśnicka 2cd, 20-718 Lublin, Poland

STABLE ISOTOPE HYDROLOGY OF PRECIPITATION AND GROUNDWATER OF A REGION WITH HIGH CONTINENTALITY, SOUTH CARPATHIANS, ROMANIA

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Abstract:

Stable isotopic composition of hydrogen and oxygen of precipitation and groundwater along with climatic information from a region situated in the external part of the South Carpathians were collected every month from 2012 to 2015. Climate monitoring indicates that the region is characterised by a high continentality index, and seasonal distribution of precipitation amount. The δ18O and δD values in precipitation varied from -4.0‰ to -15.9‰ and -22.8‰ to -118.8‰, respectively The LMWL for the monthly based data is δD = 7.40*δ18O + 4.4 showing the effect of secondary evaporation of falling raindrops with lower intercept and slope. The significant relationship between δ18O and δD values and average air temperature is δ18O = 0.36T - 13.36 (r2 = 0.69, n = 40) and δD = 2.57T – 92.80 (r2 = 0.58, n = 40), respectively. The distribution of deuterium excess over the year indicates seasonal variation for the origin of moisture, with high values during wintertime. We interpret this as the result of the input of seasonal related Mediterranean moisture during the late autumn and winter. 3-D modelling of spring distribution shows the presence of mainly two aquifer levels, slightly deepening toward south and southeast. The isotopic distribution of groundwaters reflects weighted mean of the δ18O and δD of precipitation, -9.8 and -67.8 respectively, demonstrating locally derived groundwaters.


Keyword: stable isotopes; continentality, precipitation; moisture sources, groundwater; South Carpathians


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