2019 年 25 巻 p. 315-320
Numerical simulations of overland and flood-inundation flows in Akatani river basin during Kyushuhokubu heavy rain in 2017 were performed by dynamic model. The model is based on two-dimensional shallow water equations with mass sinks due to infiltration processes. The Green-Ampt method is used for estimation of infiltration rate and cumulative infiltration volume. The model was also verified against observed flood marker and maximum inundation area. It showed that the proposed model can reproduce it with reasonable accuracy. The effects of infiltration and terrain change due to sediment on the floodinundation process was also examined based on the numerical results.
