Author(s): Tatsuhiko Uchida; Shoji Fukuoka
Linked Author(s): Shoji Fukuoka, Tatsuhiko Uchida
Keywords: Scour process; Maximum scour depth; Vertical two-dimensional model; Submerged jet flow; Wave jump flow; Sediment transport
Abstract: Local scours downstream of groundsills undermine the foundation of the structure. There are two different processes of local scour downstream of groundsills due to the flow over the structure. The duration of the developing process due to submerged jet is so short that our interest is only in the deformation of scour shape and the maximum scour depth. In this study, scour shape deformation process is computed by the equilibrium sediment transport model because of its simplicity, not emphasizing the rate of absolute sediment transport. The vertical two-dimensional model for the flow in the local scour has been developed, which employs sigma coordinate system to take into account of the variation of water surface, bed height. We confirmed that the model can compute both the scour processes under the submerged jet flow and wave jump flow. And it is found that the maximum local scour depth by the experiment is reproduced by the computation.
Year: 2007