Standartlaştırılmış yağış indeksi hesabında kullanılan dağılım fonksiyonu etkisinin ve kuraklık karakteristiklerinin araştırılması

The type and structure of rainfall varies according to various parameters such as altitude, geographical formations, vegetation, sea currents, proximity distance the sea. Thus, it is very difficult explain precipitation data with a single distribution. In study, Standardized Precipitation Index (SPI) values were obtained by fitting Gamma, Lognormal, Generalized Extreme Value (GED), Weibull, Normal, Logistic, Loglogistic distributions data. It aimed compare drought characteristics applying run theory these SPI Gamma values. Kolmogorov-Smirnov (K-S), Anderson-Darling (A-D) Chi-square (χ2) tests graphical methods used determine probability density function that best fits As result analysis, was specified GED distribution represented in Euphrates Basin better than there an average deviation 2% calculated addition, severe prolonged droughts are remarkable Basin. For this reason, necessary take measures basin, develop continuously implement reduction strategies, save water, protect groundwater serves insurance dry periods, modernize irrigation systems precautions against climate change.