Abstract
River restoration is a current topic in river engineering, where multiple functions of rivers such as the safety against flood, water resources utilization, amenity of human life and ecological system conservation are desired to be satisfied simultaneously. For this purpose, the technique to control the interactions among flow, sediment transport, vegetation and river morphology is strongly required. It is supported by fluvial hydraulics, hydraulics of flow with vegetation and habitat hydraulics, and the research from the view point of multiphase-flow study is expected to contribute them. In this paper, the new understanding of river restoration is explained by using the concept of “river landscape”, and it is discussed how the recent development of study on fluvial hydraulics related to riparian vegetation contributes to it. Since the mechanics of sediment transport and modeling of flow with vegetation are reviewed by the other authors of this volume, the studies on fractional transport of graded sediment with sorting process and the riarian morphology related to vegetation growth are focussed on herein.
