Abstract
Laboratory tests were performed to evaluate the interaction of the flow between a main channel and floodplains. In the tests, prismatic channels similar to actual river courses were used. The experimental results showed that the increase in Manning's roughness coefficient due to the interaction could be predicted by estimating an apparent shear stress acting on a vertical plane along a interface between a main channel and flood plain. The mixing coefficient at the interface f can be almost constant and its value is around 0.17. On the basis of the prediction method obtained, the classification diagram for the estimation of the flow resistance in the compound channel was proposed, by which discharge capacity is calculated well in accordance with characteristics of river course, compared with the existing method. Further more, it becomes known how the resistance to flow varies with the change in the cross-section by river improvement works.
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