Naslov
Integrated hydrochemical assessment of the carbonate aquifer of the Ivanšćica mountain

Autori
Marković, Tamara ; Larva, Ozren ; Mraz, Vinko

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
XXXVIII IAH Congress Groundwater Quality Sustainability Abstract Book / Zuber, A., Kania, J. & Kmiecik, E. - : Wydawnictwo Uniwersytetu Śląskiego, 2010, 500-501

ISBN
978-83-226-1979-0

Skup
XXXVIII IAH Congress Groundwater Quality Sustainability

Mjesto i datum
Kraków, Poljska, 12.09.2010. - 17.09.2010

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
carbonate aquifer; hydrochemistry; major cations and anions; stable isotopes; tritium

Sažetak
Groundwater is the dominant source of drinking water in Croatia. The main carbonate aquifers are situated in karstic part of Croatia. Also, some smaller but very valuable carbonate aquifers are situated in Panonian part of Croatia. During the hydrogeological investigations for determination of the sanitary protection zones of the groundwater source, hydrochemical data were used as additional tool for better understanding of groundwater renewability, circulation time, geochemical evolution, rock-water interaction etc. The study area (Mt. Ivanšćica) is located in the north-west part of Croatia. Ivanšćica is the highest mountain in this area with the highest peak 1061m a.s.l. The mountain is built of Carbon-Perm, Triassic, Cretaceous, Miocene and Quaternary sediments (Šimunić, et al. 1979, Šimunić, et al. 1983, Šimunić, 1992). The oldest Carbon-Perm sediments are clastic deposits which are generally impermeable. Lower Triassic silts, shales and sandstones are also impermeable sediments. Carbonate rocks of Triassic (T2, 3) age are dolomite and limestone which are the main aquifers. Cretaceous sediments are clastic carbonate sediments, which have poor permeability. The Miocene sediments are subdivided into lower Miocene (marly limestones, clayey sand and clay – impermeable sediments), middle Miocene (lithotamnium limestones – aquifer) and upper Miocene deposits (marl – impermeable sediments). The Quaternary sediments are proluvial sediments mainly found on slopes. The four major springs (Šumi, Beli Zdenci, Bistrica, Žgano Vino) were formed on the fault zone which is the contact between permeable carbonate sediments and impermeable sediments. The water from the springs is tapped for the water supply system of Ivanec town and surrounding settlements. The highest mean yield has Bistrica – 60 l/s, Žgano Vino and Šumi follow with 20 l/s, and the lowest mean yield has Beli Zdenci - 4 l/s. Groundwater was sampled from all springs in July and September 2008 and in February 2009. Prior to taking water samples from individual springs, the following parameters were measured ''in situ'' by probes of WTW company: EC, TDS, T, pH and oxygen content in waters. At the Hydrochemical Laboratory of the Department of Hydrogeology and Engineering Geology – Croatian Geological Survey, the concentrations of the basic anions: chlorides, sulphates and nitrates were measured by ion chromatograph of the LabAlliance company, whereas the concentrations of orthophosphates and ammonium were measured by the spectrophotometer DL/2010 of the HACH company. The concentrations of the basic cations: calcium, manganese, sodium and potassium were measured by the atomic adsorber of the Perkin Elmer company. The content of HCO3- was determined by titration. The ratios of stable isotopes of D and 18O in sampled water were measured at the JOANNEUM RESEARCH Forschungsgesellschaft mbH Institute of Water Resources Management (WRM) Hydrogeology and Geophysics in Graz, Austria and tritium was measured at Hydrosys, Budapest, Hungary. According to majors cations and anions of the spring waters, they belong to the CaMg-HCO3 hydrochemical type. This is the primary water type which is principally derived from dissolution of carbonate minerals (calcite and dolomite) that compose the aquifer. Very low concentrations of nitrate, sulfate and chloride were observed, whereas concentrations of ammonium and phosphate were below detection limit. The spring waters are not microbiological polluted. The stable isotope ratio confirms the aquifer recharge by precipitation. The tritium content indicates the long circulation time of groundwater but also the groundwater renewability by precipitation.

Izvorni jezik
Engleski

Znanstvena područja
Rudarstvo, nafta i geološko inženjerstvo

POVEZANOST RADA