Abstract
The numerical simulations of inundation flows due to dyke breach are carried out by using a distributed hydrological model and a dynamic inundation model, which comprises the finite volume method on unstructured grid using FDS technique. The model is applied to simulate inundation flows due to hypothetical dyke breach in the Onga river basin, and the study is directed towards the examination of effects of breach process as well as flood damage mitigation by flood protection forest in the basin. It is found from numerical simulations that dyke breach flows are diverted and diffused by the forest, so that hydrodynamic forces acting on houses located behind the forest are substantially reduced.
