抄録
Vegetation communities are often observed to grow in stripe pattern or patches within many stream channels. In such a situation, hydraulic engineers should examine an appropriate vegetation management system paying attention to flood control and vegetation ecosystem. On the other hand, 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. In this paper, the influence that arrangement patterns of longitudinal discontinuous vegetation zones gave to the flow resistance in an open-channel was examined experimentally. Results showed that the relationship between flow depth and discharge significantly depended on the arrangement patterns and the reason could be explained by the difference of momentum transport from main flow region to vegetation and cavity zone.
