2025 Volume 81 Issue 16 Article ID: 24-16020
For further progress of the river basin disaster resilience and sustainability by all (RBDRSA) projects, it is necessary to develop a numerical simulation model which can assess quantitatively flood risks and various flood-control measures. For this, this study proposed a coupled model with RRI (Rainfall-Runoff-Inundation) model and planar 2D model (RRI-RF2D) for river and flood flow analysis. In order to check the validity of the present model, we conducted flooding analysis in Takasaki River basin due to Typhoon Yun-yeung in 2023. The results indicated that the RRI-RF2D model can reproduce acceptably longitudinal distribution of peak water level and flooding area along the Takasaki River, showing the fundamental validity of the present model. The result also showed that the flooding water was appreciably storaged near road embankments across the river. This effect may have ensured the lead time of flooding at downstream of the road embankment, and it suggests that road embankments may play an important role as one of the flood-control measures.
