抄録
The breach discharge by overtopping flows is examined experimentally and numerically. The processof breach erosion is reproduced, employing laboratory-scale non-cohesive homogeneous embankments.The relationship between breach discharge and effective width of breach cross-section is identified by using experimental results. The relationship is compared with the one obtained from the on-site overflow experiments at Chiyoda conducted in 2010~2011. Breach discharge is calculated by the numerical model that simultaneously solves flood flows in a channel and inundation flows in a flood plain with the dynamic inundation model, which comprises the finite volume method on unstructured grid using FDS technique. It shows that breach discharge can be predicted comparatively by the use of the model with the h-q boundary condition and effective width of breach cross-section.
