Abstract
Mathematical models for defining three-dimensional turbulent flow and bed topography in meandering sand-silt rivers are presented, and interaction between them is analyzed. It is revealed theoretically that the secondary flow shows reduction in its magnitude from that of uniformly-curved open channels and shows phase-lag against the channel plan-form. A model for defining bed topography is derived by considering sediment balance for both bed load and suspended load, the transport rates and directions of which are obtained from the flow field thus determined. Laboratory tests have supported the present models. The study presented herein has made it possible to predict the large-scale bed topography of meandering sand-silt rivers such as the magnitude and the location of local scour and point-bar deposit.
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