Comparative application of four methods of groundwater vulnerability mapping in a Slovene karst catchment
- Permanent Link:
- Comparative application of four methods of groundwater vulnerability mapping in a Slovene karst catchment
- Series Title:
- Hydrogeology Journal
- Ravbar, NataÅ¡a
- Publication Date:
- Subjects / Keywords:
- Groundwater Vulnerability Mapping ( local )
Slovene Karst Catchment ( local )
Slovene Approach ( local )
Inner Zone ( local )
Outer Zone ( local )
Epik ( local )
PI, Simplified Method ( local )
- serial ( sobekcm )
- Four methods of groundwater vulnerability mapping have been applied in a Slovene karst catchment and validated by tracer tests. The test site is characterised by high water table fluctuations, manifested in intermittent lakes and variable drainage divides. A first multi-tracer test (two injections) allowed subdivision of the catchment into zones of different degrees of contribution (â€˜inner zoneâ€™ and â€˜outer zoneâ€™). For vulnerability mapping, only methods that consider the specific nature of karst aquifers such as heterogeneity and duality of infiltration processes, were selected: EPIK, PI, the â€˜Simplified Methodâ€™ and the â€˜Slovene Approachâ€™. For validation, a second multi-tracer test (four injections) was carried out. The time of first detection and the normalised recovery were used as validation criteria. The results suggest that EPIK and the Simplified Method sometimes overestimate vulnerability, while PI and the Slovene Approach tend to deliver more realistic results, at least during low-flow conditions. The Slovene Approach gives the clearest guidance on how to deal with hydrologic variability, for example by assigning lower vulnerability to occasionally active sinking surface waters than to permanent ones. As a conclusion, commonly accepted validation techniques are needed and should be applied by default to evaluate different vulnerability mapping methods and the resulting maps.
- Original Version:
- Hydrogeology Journal, Vol. 17, no. 3 (2008-10-15).
- Source Institution:
- University of South Florida Library
- Holding Location:
- University of South Florida
- Rights Management:
- This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.
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