An investigation of adjustment between effective discharge for suspended sediment (Qeff) and discharge with 1.5 years recurrence interval (Q1.5) in some rivers of Daryache Namak Drainage Basin
2006
Dastoorani, Jafar | Fazlollahi, Ali | Salajeghe, Ali | Dastoorani, Qasem
Effective discharge for suspended sediment (Qeff) that transports the most of suspended sediment in rivers and controls the bed conditions is an important criterion for evaluating the quality of water. Qeff usually has 1.5 years recurrence interval on the yearly maximum flood series. For examining adjustment between Qeff and Q1.5 in ten stations of Daryache Namak Drainage Basin, at first the probability density function (pdf) of daily flows and sediment rating curves was plotted, after that probability density function of suspended sediment was constructed by multiplying the coefficient of sediment rating curves with pdf of daily flows. Then its recurrence interval was estimated by Vibul's method. The results showed that there is not any adjustment between Qeff and Q1.5, Also the ratio of Qeff to Q1.5 was ranged from 1.03 to 16.8, Therefore the more research is necessary to reaching the certain result. Keywords: Effective Discharge for Suspended Sediment, Q1.5, Probability Density Function, Sediment Rating Curve, Daryache Namak Drainage Basin.
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