Abstract
Characteristics of flood flow and bed topography in compound meandering channel were investigated by the result of laboratory experiments and using hydraulic and velocity vector data of flood flows, river configuration, and bed topography obtained at several natural rivers. From the data analysis of meandering compound channel flow in the laboratory natural streams, the flood flow was classified into two categories the meandering compound channel flow and meandering single channel flow, according to the relative depth above and below of 30% respectively, in case the sinuosity of the meandering compound channel flow is above 1.015. We also investigated inner bed topography through boreholes of inner bed of Gonokawa-river during flood. For both the natural river and laboratory channel, similar phenomenon of scouring occurred at the inner bed for compound meandering flows. Finally, we indicated several problems and proposed investigation method for the rational river planning of a compound meandering river.
