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  • Stable isotopes as natural tracers of the karst recharge to the tertiary clastic aquifers : a case study of the southern part of Ljubljana marsh (Ljubljansko barje, Slovenia) = Stabilni izotopi kot naravna sledila pri napajanju terciarnega klastičnega vodonosnika iz krasa : študija južnega dela Ljubljanskega barja, Slovenija
    Pezdič, Jože
    The main purpose of the research was to determine the rechange and storage of grounwater at the southern part of Ljubljana marsh where tertiary aquifers arefilled mainly with karst water. Stable ... isotopes of hydrogen, oxygen and carbon in water or in dissolved species, as well as tritium content in water and precipitation wewre used as natural tracers to follow the recharge and discharge of surface streams and aquaifers. Together with hydrogeological and other chemical evidence they provide useful information about water mass transport, storage, refilling of aquifers and mixing of groundwater. In the aquifers, springs and surface river water [delta] [sub] 18 O varied from -9,65 to -8,82 %o while [delta] D has the range from -67,4 to -61,2 %o. Tritium activities are measured from 1,6 to 13,4 T.U.. Long term averages (n=13 years)for [delta] [sup] 18 O ([delta]D) in Ljubljana is -8,73 (-60,6)%o and tritium content is 17,5 T.U.. The mean temperature in Ljubljana is 10,03 [sup] 0 C and average years precipitation amount is 1332 mm. Years 1992-93 have been characterised by low tritium ncontent in precipitation (8,2 for 1992 and 10,6 for 1993) and so important for investigation. The average mean meteoric line for the last 14 years is defined as [delta] D = 8,188 x [delta] [sup] 18 ) + 10,66. Temperature correlation vs. oxygen is: [delta] [sup] 18 O = 0,254 x t - 10,78. The above database is diccussed in order to evaluate thesis about karst influence on the recharge and storage of clastic sediment aquifer in the Iška delta sediment structure.
    Vir: Acta carsologica = Krasoslovni zbornik. - ISSN 0583-6050 (Let. 27, št. 1, 1998, str. 349-360)
    Vrsta gradiva - članek, sestavni del
    Leto - 1998
    Jezik - angleški
    COBISS.SI-ID - 9194285

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