KALIBRACIJA I VALIDACIJA MODELA EPIZODA U KARSTNOM SLIVU
For the assessment of the hydrological regime, the impact of natural or anthropogenic changes on the watershed, and the evaluation of flood events in gauged and ungauged watersheds, hydrological models are increasingly being used. The HEC-HMS model for rainfall-ruoff events was utilized to model three distinct events from different periods prone to floods at the hydrological station in Drvar on the Unac River. Considering that this is a karst watershed, modeling runoff presents a unique challenge. This study examined the applicability of a relatively simple model, parsimonius in parameters and input data, as well as the transfer of model parameters from one event to another. The input data for the calibration and validation of the model consisted of hourly discharge and precipitation data. The study performed manual calibration by adjusting one parameter at a time. Based on efficiency measures (PBIAS, NSE, RSR), a set of parameters was selected for each rainfall event. The final calibration results demonstrated a good agreement between the observed and computed hydrographs according to all efficiency measures. In the validation process, the efficiency measures were poorer, and the transfer of parameters from one event to another was partially successful.