Flow Resistance and Turbulent Structure in Open Channel

Abstract

The cavity zone along riverside is expected to produce native habitats of various ecosystems and water-friendly environment. However, effects of side cavities on flow resistance and turbulent flow structures are ambiguous, because the side cavity generates the complex separated vortices. In this paper, the flow resistance and turbulent flow structure in open channel flow with lomgitudinally continuous side cavities were examined experimentally. The flow velocity was measured by using a two-component electromagnetic current-meter. Results showed that the flow resistance significantly depended on aspect ratio of side cavity and the reason could be explained by the difference of momentum transport through the interface between the side cavity and main flow region.