2025 Volume 81 Issue 16 Article ID: 24-16075
This paper presents the numerical study of the wind effect on flood propagation as well as discharge by rainfall-runoff-inundation simulation. A shallow water equation and a distributed rainfall-runoff-inundation model with the shallow water equation were used. First, the shape, velocity and range of the flood propagation with and without winds are investigated. As a result, the speed of the propagation increases with the wind in the moving direction, but if the depth increases or decreses depends on the locations of the entire wave. Likewise, the wind movement changes clearly by giving the observed wind. Finally, the changes of the discharge at Arakawa River catchments by runoff simulations are investigated targeting the real flood event on 2019. As a result, the changes of the discharge with the actual observed wind was not so significant. When the observed wind is doubled or tripled in magnitude, the changes of the discharge become more apparent. The paper presents these results.
