Effects assessment of the climate Change on water resources of Dararood Basin

The global climate is changing, and impacts of climate change are being observed across the world. In recent years, particularly the effects of climate changes on the Earth’s water resources are very considerable. Dararood Basin is one of the subbasin of Aras river catchment. Considering Water supply, Dararood river plays an important role in the study area. Unfortunately, in recent years the amount of water in this area has decreased. Investigating trend in climate and hydrological variables can help to identify the possible climatic changes and fluctuations. In order to identify trend in hydro-meteorological time series data among the nonparametric test, Mann-Kendall was used wildly. The purpose of this study is investigating fluctuations and trends in river flow under potential impact of climate fluctuations using the Mann-Kendall test, during 20 years (1994-2013). For this purpose climate data of four stations including Ahar, Moshiran, Meshginshahr and Parsabad along with 7 hydrometric station data (Cassin, Orang, Oshdalaq, Arbabkandi, Dostbyloo, Boran and mashiran) were used. The results showed that the annual flow of all stations have decreasing trend during the study period. Also the results of this study showed no significant correlation between climatic fluctuations and annual river flow based on the annual average during the study period