This master's thesis investigates the applicability of the conceptual hydrological model GR6J for analyzing hydrological processes in relation to climate change, considering various RCP scenarios. The study was limited to the Sava River catchment up to the Litija gauge station. The theoretical part describes climate change and its impact on society, the economy, and the rising frequency of extreme weather occurrences. Emphasis is placed on human responsibility for such changes, and their consequences – melting of glaciers and snow, sea level rise, floods, and droughts. The second part relates to hydrological models used to manage water resources and hydraulic structures, examining, evaluating, and assessing the possibilities of the mentioned events occurring. The research part of the master's thesis focuses on evaluating the impact of climate change on hydrological processes until the year 2100. We focused on identifying potential changes in the flow of the Sava River at the Litija gauge station based on precipitation and air temperature. We also examined the impact on flood events in different RCP scenarios. Using NSE, KGE, and KGE2 coefficients, we verified the performance of the calibrated hydrological model. Based on the results, we analyzed the number of excess flows, absolute and relative differences in excess flows, and examined Q95 and MAM7 low flows. We discovered that in the future, there will be more excess flows above 1514 m3 /s, indicating that the Sava River will flood more frequently at the Litija gauge station. The findings also revealed a growing tendency of low flows for the stricter RCP 2,6 and RCP 4,5 scenarios.
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