Perched aquifers spatial model: a case study for Ljubljansko polje (central Slovenia)

Ljubljansko polje aquifer is one of the biggest and most important aquifers in Slovenia. In general it is an unconfinedaquifer, but locally, on the SW part, layers with low hydraulic conductivity appear and on those areas perchedaquifers are formed. Based on lithological data from boreholes (emphasizing hydraulic conductivity of lithologicalunits) and use of geostatistical method Sequential Indicator Simulation (SIS) hydrogeological model of westernpart of Ljubljansko polje was made. In the model layers with hydraulic conductivity K < 10-6 m/s and area largerthan 0.07 km2 were defined as potential areas of perched aquifers. The majority of them are located on the foothillsof i enski and Grajski hrib.