The master's thesis is based on available amount of water resources in Southeastern Europe. Quantity of water resources is changing due to different climate variables. These are temperature, precipitation and evapotranspiration, derived from an ensemble of different global and regional climate models. The data are shown for two periods: for the reference period in 1981–2010 and for the future in 2021–2050 (according to the RCP 8.5 emission scenario). Local total runoff (LTR) represents the theoretical available amount of water resources, which is calculated from the basic climate variables. Water demand data (WD) were acquired for various sectors, namely households, industry, and agriculture. Local water exploitation index (LWEI) is determined by water demand in relation to the total local runoff, which shows the vulnerability of water resources or water stress due to climate changes. LWEI is presented on an annual and seasonal basis (considering summer and winter season). The final assessment of water resources vulnerability is determined by the annual local water exploitation index corrected for seasonality (LWEIasw) for both scenarios. It is specified with four stress classes. The results show the vulnerability of water resources on climate change, without determining water quality and the adaptive capacity factors. The most vulnerable are areas where the water supply is small, and the local water exploitation index is high. In Southeastern Europe, these countries are Greece, Albania, Macedonia, Bulgaria, Romania, Montenegro, Serbia, Croatia and Hungary.
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