抄録
Local scouring which occurs at the downstream bed of weirs is a very important problem because the local scouring reduces the stability of the structures. Since the local scouring progresses rapidly at the time of submerged jet flow, it is very important to calculate the submerged jet flow with high accuracy on the prediction of the bed deformation. In the previous studies, two-dimensional vertical (2DV) model has been used mainly for the predicting of the flow and the bed deformation. However, a possibility that the 2DV model cannot reproduce the submerged jet flow accurately by the hydraulic conditions has been indicated. Therefore, in this study, we conducted comparisons between 2DV model and three-dimensional (3D) model for the reproducibility of the submerged jet flow. Consequently, in the case of the constant width-to-critical flow depth ratio (B/hc), it was clarified that the 2DV model cannot reproduce the flow with high accuracy when the width-to-weir height ratio (B/W) and the width-to-downstream flow depth ratio (B/ht) become small.
