It has been known that organized horizontal vortices are generated at the junctions of main channel and flood plains for two-stage channels, and they yield sediment transport between main channel and flood plains. In the present laboratory tests, it was found that the relations of the organized vortices and lateral suspended sediment transport in compound open channel flow with bank vegetation.Numerical computations were performed by employing SDS-2DH turbulence model. For channels with bank vegetation, it was found that sediment transport is closely correlated with large scale horizontal vortices which are generated in the main channel and deposition rate takes a maximum value in the vegetation area.
The laboratory tests were performed to analyse the flow in curved compound channel with small relative depth. It was found that the horizontal vortices appear at the junction of a main channel and flood plains in the outside area and the secondary flows by centrifugal forces appear in a main channel.Next, in order to simulate flow in curved compound channel, numerical computations were performed by employing one equation model as turbulent model. The result agrees well with the experiments in the middle of a main channel or flood plains, but not with the experiments at the junction of a main channel and flood plains in the outside area. To simulate the flow more accurately it was found that the effect of horizontal organized vortex must be considered. The numerical computation has revealed that flow in curved compound channel with flood plains consists of three circulating cells induced by centrifugal forces.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.