Abstract

Rapidly varied unsteady flow in open channels with the circular cross section is investigated to predict the hydraulic transients in the underground floodways, which have been constructed to mitigate the flood disaster in the metropolitan area for the last decade. The momentum equation for open channel flows with the circular cross section including the effect of the vertical acceleration is derived in this study. The basic equations are applied to the laboratory test on the undular bore, and are verified through the comparison of the calculated results to the experimental ones.

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