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Despite the recent popularity of studying the effects of climate change on critical regions worldwide, there is a paucity of data documenting the results from trend analysis for these regions based on hydro‐climatic variables such as precipitation and temperature. The purpose of this study was to undertake a spatio‐temporal precipitation and temperature trend analysis for the Seyhan and Ceyhan River Basins located in the south of Turkey. The data for the seasonal and annual temperature variations (minimum, maximum and mean) and the total precipitation outputs obtained from the 14 stations in these basins are considered. The non‐parametric Mann–Kendall and the Mann–Kendall rank correlation tests are employed to determine the trend and its year of initiation. The linear slopes of the trends are calculated by using Sen's slope estimation technique and the spatial distributions for the slope of trends are presented. The results show that statistically significant upward trends exist for these basins based on the annual maximum temperature values, and the years of initiation of the trends are determined as mid‐1990 and mid‐2000. [ABSTRACT FROM AUTHOR]

In this study, it was aimed to investigate long-term trends of annual precpitation data recorded in sixteen stations operated by DMI (Turkish State Meteorological Service) and DSI (State Hydraulics Works) in Büyük Menderes Basin (Turkey) using Mann-Kendall test with TFPW (Trend-Free Prewhitening) procedure that eliminates the serial correlation for time series containing serial correlation. The slopes of trends were determinded by Sen's Slope Estimator. Homogeneity of trends among stations was tested using Van Belle and Hughes test. The results showed that total annual rainfall increased at only two stations, while decreased at other stations. However, the trend at only one station is statistically significant at 5% level. Temporal patterns of DSI-stations were found to be consistent with those of DMI-stations. Decreasing trends among the stations was found to be homogeneous. It is expected that demand on fresh water resources will increase due to decreasing rainfall as a consequence of climate change, together with domestic, industrial and agricultural water use. To cope with the expected water scarcity in the basin, reuse of treated wastewaters, especially in agriculture, may provide an important opportunity. Hence, this may alleviate the competition among water users, and fresh water resources can be allocated to domestic and industrial use. [ABSTRACT FROM AUTHOR]