2018 Volume 24 Pages 445-450
A distributed rainfall-runoff and flood flow simulation using one-dimensional river network model in the right bank basin in Chikugo river midstream due to Kyushu-hokubu heavy rain in 2017 was performed. The one-dimensional river network model consists of one-dimensional unsteady flow model with simple treatment of a river structure and connecting cells, which give a boundary condition for each river. The simulation results were verified against flood event in the Chikugo river basin. It showed that the proposed model could reproduce the behavior of flood flows in the Chikugo River with reasonable accuracy. The discharge and water-level hydrograph in plural tributaries were also examined. It showed that simulated results were matched with survey result and resident's testimony.
