Flow and bed topography in a meandering compound channel with phase difference between the alignment of the main channel and levee

Abstract

In a meandering compound channel with the phase difference between the alignment of a main channel and levee, velocity fields, bed variation and exchange flow between the main channel and flood channel are investigated by a large flume experiment. The outer boundary line of the exchange flow region intersects with maximum velocity filament in the main channel at the inflection point of the meandering main channel. The horizontal flow field is devided into two at the height of the flood channel. The bed variation which arises near the inner bank is mainly caused by the streamwise change in the maximam velocity in the main channel.