Author(s): Hirotaka Une; Terunori Ohmoto; Kazuki Kuranaga
Linked Author(s): Terunori Ohmoto
Keywords: Submerged weir with an opening; River bed morphology; Local Scouring; Live-bed conditions three-dimensional turbulent flow; Cellular secondary currents
Abstract: Scouring or depositing downstream of submerged weirs with an opening is a sediment phenomenon resulting from the interaction of the three-dimensional turbulent flow field around the structure and the moveable sand bed. This paper presents the experimental study on the downstream bed topography due to weir with square shape of an opening, paying attention to the effects of non-dimensional relative tractive force on local scouring around the structure and three-dimensional flow patterns. The experiments were conducted under the live bed condition for an equilibrium scour hole. The experimental results show that local scouring holes have a similarity in shape and their maximum scouring holes around the structure depend on relative tractive force. Three-dimensional flow pattern with cellular secondary currents show the strong correlation with the scouring hole.
Year: 2020