2024 Volume 80 Issue 16 Article ID: 23-16009
To prevent and reduce house damage due to flooding, it is important to understand the quantitative evaluation for house damage under a wide variety of hydraulic conditions. This study aims to clarify the relationship house damage and hydraulic properties under the temporal variation of the breach width. The target was the flooding in the Kinu River with the levee breach at 21 kp, in which the width varied temporally. For this, we conducted a coupled numerical analysis for river flow and flooding flow. The results indicated that the flow velocity and inundation depth around the point of levee breach varied appreciably with the breach widths. The velocity and inundation depth at most of collapsed houses were larger than 2 m/s and 2 m, respectively, which are a threshold for house collapse. On the other hand, there were completely collapsed houses with a small flood depth below the collapse limit, suggesting the importance of scouring the ground around houses.
