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Nitrate pollution in groundwater, originating mainly from agricultural activities, remains a worldwide issue. This\udis also pertinent to Slovenia, where nitrate leaching from agricultural areas is one of the major groundwater resource\udmanagement problems. The contamination spread in the aquifer is directly related to the hydraulic properties of\udthe upper, unsaturated and the lower, saturated zone. The article presents study of water and nitrate pollution\udtransport in the unsaturated zone in a fild laboratory – lysimeter in Selniška dobrava. Water and nitrate transport\udparameters were estimated by a combined tracing experiment with deuterated water and Ca(NO3)2. Deuterium was\udused as a conservative tracer of water movement, and Ca(NO3)2 was used as a nitrate tracer in the unsaturated zone.\udThe δ2H and nitrate concentrations in the unsaturated zone water were measured monthly during the period from\udApril 2006 to July 2007. All together 36 samplings were performed. The fastest and dominant flw velocities were\udcalculated based on injection time, the fist tracer appearance time, and the time of highest concentration. Mean\udflw velocity and vertical dispersion were estimated by an analytical best-fi method using the one-dimensional\udconvection–dispersion model. The results were used to estimate the nitrate transport parameters in the coarse\udgravel aquifer Selniška dobrava. They can be used also for nitrate transport estimations in other aquifers with\udsimilar hydrogeological characteristics and can serve as a base for determining the measures for nitrate reduction\udin groundwater

Assessment of nitrate transport in the unsaturated (coarse gravel) zone by means of tracing experiment (Selniška dobrava, Slovenia)