Environmental Earth Sciences

, Volume 70, Issue 2, pp 901–912 | Cite as

Increase of vulnerability of karst aquifers due to leakage from landfills

  • Janja Kogovšek
  • Metka Petrič
Original Article


Karst aquifers are very vulnerable to various pollution sources. Among these, landfills can contribute contaminants over long periods. Groundwater quality monitoring is required to assess the impact of a landfill leachate on underlying aquifer water or spring discharge. Tracer tests are useful for selecting the location and frequency of sampling. Three landfill sites in karst areas were studied with tracer tests. Additional insight was accomplished by the comparison of the tracer transfer and the breakthrough curves obtained from these tests with the results of two other tracer tests carried out in the same period in karst areas without a landfill. To explain the differences observed, the hypothesis of increased permeability below the landfill due to the presence of inorganic acids in leachates was further tested. The results of detailed, long-term monitoring of contaminated drip water in the Postojna Cave were used to verify the hypothesis. The analysis of the simultaneously increased content of calcium, magnesium, and contaminants in the drip water indicates a direct correlation between limestone dissolution and contaminants. Increased dissolution increases secondary porosity and thus permeability of the vadose zone resulting in higher vulnerability of underlying aquifers and springs in the vicinity landfills.


Karst aquifer Landfill Tracer test Contaminants Increased vulnerability Slovenia 



The study was conducted in the frame of the research programme P6-0119 “Karst research” funded by the Slovenian Research Agency. Tracer tests were carried out as various applied projects financed by the companies which manage the landfills (public companies Komunala Ribnica, Komunala Kočevje, and Komunalno stanovanjsko podjetje Sežana), Ministry of defence, and Ministry of transport. We would like to thank the Slovenian Environment Agency and the ACEGAS company for giving us the precipitation and discharge data free of charge.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.Karst Research Institute at ZRC SAZUPostojnaSlovenia

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