engleski

Groundwater research for the groundwater vulnerability mapping of the „Žumberak-Samoborsko gorje" Nature Park

There are 19 protected areas in Croatia: 8 National Parks and 11 Nature Parks. «Žumberak-Samoborsko gorje» Nature Park was established in 1999. on the grounds of the richness of its natural and cultural heritage. It covers approximately 333 km2 of mountainous karstic terrain, rising from 180 to 1178 m above sea level with its highest peak–Sveta Gera (Trdinov Vrh in Slovenia). It is situated in the central western Croatia next to the border with Slovenia, between the Kupa and the Sava rivers. “Žumberak-Samoborsko gorje” NP is part of the north border of Dinaric karst. The main part of area is covered with carbonate rocks–mainly Triassic dolostones. There were investigated over 130 speleological objects with estimated total number of around 150. There have been recorded 337 springs until 2007, but with very few data on them. The Park’s Authority started comprehensive hydrogeological research of its area at the beginning of the year 2007. That will be continued through a few stages to collect input data for groundwater vulnerability map. The first stage-groundwater recognition started and finished in the year of 2007. It resulted in 825 recorded mainly permanent springs. Through field research the following spring’s data were collected and measured: spring ID, usage, location, x , y, z coordinates, lithostratigraphic description, type of the spring, discharge (l/s), water temperature (oC), pH, Eh (mV), conductivity (μS/cm), TDS, oxygen concentration (mg/l), oxygen partial pressure (hPa), oxygen saturation (%), photographs. The data were stored within GIS database (ArcGIS). The second stage of research started in February 2008 and is still running. It includes 14 representative springs - monthly field measurements & sampling for 18O and 2H for the next 1-2 years.

karst hydrogeology; springs;

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