Author(s): Tetsuro Tsujimoto; Yoshihiko Shimizu; Hiroji Nakagawa
Linked Author(s): Hiroji Nakagawa
Keywords: No Keywords
Abstract: Hydraulics in vegetated streams becomes important increasingly for designing comfortable river environments. In this study, turbulent flow structure and suspended sediment transport in a vegetated sand bed channel is investigated. Firstly, the turbulent structure of open channel flow over a vegetated bed is clarified by means of both experiments and numerical analysis based on k-ε turbulence model. Secondly, the turbulent flux of suspended sediment is estimated by assuming a similarity between the change of turbulent flux distribution of suspended sediment due to the presence of a vegetation layer and that of turbulent momentum flux (Reynolds-stress distribution). Based on the above, the concentration distribution of suspended sediment offlow in a vegetated- bed channel is predicted against the vegetation density.
Year: 1991