Long- Term Numerical Predication of Sediment in Ekbatan Reservoir Dam

Generally recognization, analysis and predication of sediment amount and distribution in the reservoir dams with different inflows because of various parameters was selected and used. Involved is one of the major problems of sediment hydraulics.For this purpose two-dimentional model GSTARS 2.0. The special charactristic of this model is the usage of stream tube concept in analyzing the hydraulic specifications and sediment transport. Ekbatan dam and its two rivers called the Abshineh and Abro were considered in this study.By using model GSTARS 2.0, the volume capacity of Ekbatan dam was calculated 3.39 milion meters cubic. Therefore, from start up of operation in 1963 untill now 57.63 percent of the reservoir initial volume is filled with the sediment. For predication of the remained useful age of Ekbatan reservoir, the ARIMA statistical model was used. Firstly the discharge amount of the inflow rivers of dam determined and then amount of deposition and behaviour of sediment distribution in long time was studied. The calculation showed the time need for filling the reservoir is about 56 years. Finally, it could be concluded the useful period of dam will be finished in 18 years time (2019).