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We have conducted laboratory flood experiments by applying the similarity law to real flood in meandering compound rivers. Comparing steady and unsteady flow in meandering compound channel with unsteady flow in meandering single channel, we investigated the hydraulic effects of plan and cross-sectional shapes of channel on flood flow.In the case of a unsteady meandering compound channel flow, the discharge and velocity had two values for the same depth; on rising and falling stages. Comparing stage hydrographs for meandering compound channel and meandering single channel it was observed that, compound meandering channel had early response giving high values during rising stage and delayed response giving high values during falling stage. Also for both compound meandering channel and meandering single channel, increase of sinuosity and unsteadiness the maximum velocity occurred early on flood flow.

EFFECTS OF UNSTEADINESS, PLANFORM AND CROSS-SECTIONAL FORM OF CHANNELS ON HYDRAULIC CHARACTERISTICS OF FLOOD FLOW