Evaluation of flow resistant equations by Einstein-Barbarossa and White et al s methods in determining the stage-discharge rating curve of river (Case study: Golgol river of Ilam)

The stage-discharge rating curve is among the basic data for hydrological, hydraulic and river sedimentation calculations. This curve can be empirically drawn for river sections where there are measurement stations. The stage-discharge equation is a flow resistant equation which is utilized to determine the hydraulic depth or radius in the case that the discharge and geometry of river, slope of bed, and characteristics of bed materials are clear. This study seeks to provide the best method for developing this equation. Therefore, the methods by Einstein-Barbarossa and White et al are utilized according to the measured data at Golgol Hydrometric station located on Golgol river of Ilam. The statistical comparison is done by absolute mean error (AME) with respect to the measured discharges after collecting the required data and corresponding stage by two mentioned methods on 16 May 2013 (flood day). The results indicate that Einstein-Barbarossa s method has the lowest absolute mean error of 0.80 cubic meters per second, while the method by White et al has the absolute mean error of 10.39 and it predicts the constant flow discharge for one stage higher than the convention

Evaluation of flow resistant equations by Einstein-Barbarossa and White et al s methods in determining the stage-discharge rating curve of river (Case study: Golgol river of Ilam) Keywords:

Stage-discharge , Einstein Barbarossa , White et al , Golgol , Ilam , Hydrometric station , AME