Author(s): Gökçen Bombar, Mehmet Şükrü Güney
Linked Author(s): Gökçen Bombar
Keywords: Bed load transport, unsteady flows, mobile bed, numerical solution
Abstract: An elaborate experimental system is designed and built in Hydraulics Laboratory of Dokuz Eylul University, in order to study the bed load transport under unsteady flow conditions. Two triangular shaped input hydrographs having same base and peak discharges but different rising limb durations are generated by adjusting the pump rotational speed. The bed load is collected at the downstream end of the channel by means of mobile baskets. The time-varied water depths are measured. The velocity profiles are obtained by using Ultrasonic Velocity Profiler (UVP). The governing equations are numerically solved by using the simplified finite differences technique. The variations of bed elevations, velocities, flow depths and the bed loads collected in baskets are compared with those obtained from the numerical solutions. Different time and space increments are taken into consideration and an error analysis is also performed. The obtained results are evaluated, and an acceptable accordance between experimental findings and numerical results is observed. It is revealed that, the equation given by Engelund and Fredsoe for the calculation of bed load transport is more compatible with the experimental findings
Year: 2017