Variations and Trends in Temperature, Precipitation and Stream-flow Series in the Buyuk Menderes River Basin

The main aim of this study to reveal long-term changes and trends in the time series of temperature, precipitation and stream-flow of Buyuk Menderes River Basin. According for this purpose, temperature and precipitation series of Usak, Afyon, Denizli and Aydin and stream-flow series of Kestel and Cine creeks is evaluated. Nonparametric Mann-Kendall statistical test results showed an increasing trend of the temperature. The long-term trend of annual precipitation demonstrated a decreasing trend in Afyon, an increasing trend in Denizli, Aydin, Usak; however, it was not found to be statistically significant. The stream-flow of Kestel and Cine creeks showed an increasing trend in the last 20 years, but it was not found to be statistically significant.