EXPERIMENT ON EFFECT OF POSITIONAL RELATIONSHIP BETWEEN IN-CHANNEL SUPPLIED SAND AND SANDBARS ON THE TRANSPORT PROCESS

Abstract

 In this study, we conducted laboratory-scale experiments to investigate the optimal position of in-channel sediment supply so that the supplied sediment is widely transported in the river channel. A set of experiments were conducted where we changed the relative position between sandbars and the supplied sand. We used colored particles for the supplied sediment to clearly understand its transport. Our results show that the supplied sediment is most likely to be transported into the river channel when it is placed at a location so that the riverbed elevation rises from the scour. We also found that the increase in local sediment supply leads to a shorter wavelength of the sandbar placed of the supplied sediment.