Simulation And Estimation Of Effective Discharge Of Annual Flood (Case Study: Jarahi River, Khuzestan, Iran)
Keywords: bankfull discharge, effective discharge, sediment curve, hydrometric stations
ABSTRACT: To calculate the amount of suspended sediment load and designing the hydraulic structures and determination of the optimal width and other hydraulic characteristics of the river, equilibrium flow or in other words, the prevailing flow should be recognized. In the present study, to investigate and recognize the effective discharge of sediment delivery in Jarahi River, three hydrometric stations located on the main branch of the river were selected. To calculate the suspended load in the studied stations, a regression relationship was established between flow rate and sediment discharge (sediment curve). Finally for each of these stations, the rate of effective discharge, dominant discharge and the discharge with a return period of 2.5 years were calculated and compared based on the normal distribution and two-parameter gamma methods. The results showed that the effective discharge rate and bankfull discharge are almost equal in stations and in the absence of data to find effective discharge, the dominant discharge (river design discharge) can be determined by river full section removal.
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