Denizhan Mersin - Department of Civil Engineering, Izmir Institute of Technology, Izmir, Turkey,
Mir Jafar Sadegh Safari - Department of Civil Engineering, Yaşar University, Izmir, Turkey,
Babak Vaheddoost - Department of Civil Engineering, Bursa Technical University, Bursa, Turkey,
Gokmen Tayfur - Department of Civil Engineering, Izmir Institute of Technology, Izmir, Turkey,

Drought is one of the most important phenomenon related to the agriculture-food and socio-economic problems all over the world. The Aegean region has a variety of water resources, including but not limited to seacoasts, lakes, streams, and groundwater aquifers. For this reason, the evaluation of historical and future drought events and their effects on water resources is important in the planning and development of the region. In this context, this study aims to evaluate the historical droughts in the inner Aegean region. Monthly precipitation time series were used in three meteorology stations, which are in the Büyük Menderes basin and have a continental climate, recorded between ۱۹۷۳ and ۲۰۲۰. First, to figure out whether the drought analysis is correct and dependable, consistency, randomness, and trend in time series were investigated using the binary mass curve, run and linear trend tests. Next, the standardized precipitation index SPI is used in conjunction with the moving average (MA) operator to evaluate the historical gap associated with meteorological (SPI-۱), agricultural (SPI-۳), and hydrological (SPI-۶ and SPI-۱۲). Finally, the results are evaluated based on the behavior of the SPI time series at different time intervals.

Uşak, Standardized Precipitation Index, Precipitation, Denizli, Drought assessment, historical drought