Abstract: Numerous formulations have been proposed linking friction factors to the gravel-bed river downstream hydraulic geometry. Data from 280 rivers show that existing gravel-bed power and semilogarithmic formulations fail to ...

Abstract: Field experiments carried out on five reaches of the meandering cobble-bed Beheshtabad River in central Iran showed that the position of the maximum velocity was independent of the relative submergence (

Abstract: The effect of nonuniformity of flow on hydraulic geometry relations is investigated. Using data from a historic channel in Isfahan, central Iran, which was constructed 400 years ago, it is found that the nonuniformity of ...

Abstract: Using a large set of field and laboratory data, this study investigated the effect of slope and the Shields parameter on the friction factor. It identified the ranges of critical shear stress and bed slope for which Froude ...

Abstract: This study compared the downstream hydraulic geometry relations for stable channel design derived by other investigators with the equations derived from the data gathered from Iranian rivers based on the at-a-station method. ...

Abstract: This study investigated the sediment entrainment and critical shear stress in gravel-bed rivers. Measured rates of bed load transport were used to estimate the Shields stress parameter. The computed parameters were compared ...

Abstract: Friction factor plays a fundamental role in hydraulic analysis and design. In coarse-bed rivers friction factor depends on grain size and bed forms. Considering boundary-layer characteristics, this study first determines ...

Abstract: On the basis of laboratory experiments, this paper investigates the effect of different bed forms and vegetated banks on flow velocity, Reynolds stresses, and turbulence intensities. Experimental measurements were made ...