Abstract
Flood flow in Japan possesses characteristics tat the rate of water level change in rising stage is large. Cross-sectional shapes of middle and down-steam region of Japanese rivers employ compound ores consisting of main channel and flood channels. It is, therefore, required to understand the hydraulics of flood flow through various shapes of compound channels for design of safe and environmentally rich rivers. But, there are almost no reliable reference books describing such hydraulic hydraulics. We focused on unsteady hydraulic phenomenon of flood flows in compound meandering channels, and made a study on effects of channel characteristic and of flood characteristics on storage of flood flow. As a result, we clarified influences which plan and cross-section shapes of rivers, boundary condition at the downstream end and unsteadiness on propagation of flood flow and also evaluated the storage volume of flood flow in a channel.
