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

Abstract

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