2022 Volume 78 Issue 2 Pages I_673-I_678
In Niimi city, debris flow and inland flooding occurred on September 3, 2019 because of 100 mm/h torrential rains. To perform reproducible calculations for such compound disasters, it is important to establish a highly accurate simulation model that combines debris flows and inundation flows. For this study, reproduction simulations for the disaster were conducted using a model that combines a two-dimensional debris flow model and an inundation flow model using one-way coupling method. Analysis results showed that sediment accumulation around the drainage channel not only reduced the drainage flow rate; it also strongly affected inundation water flow conditions, suggesting that sediment accumulation might have increased the local inundation depth.
PROCEEDINGS OF HYDRAULIC ENGINEERING
