堤防脆弱性指標に基づく洪水位下降時における裏法安定性に関する研究

抄録

It is important to predict locations and times of levee failures during floods for reducing the risk of the levee breach and performing the safe evacuation of residents. Fukuoka and Tabata have proposed the estimation method of locations and types of levee failures by the levee vulnerability index. Discussions so far have been focused on the period of flood rising stage and showed the availability of the index.

In this study, we derived the levee vulnerability index of the levee back slope at the time of falling stage of floods from the streamline network analysis using seepage flow data measured for large-scale levee experiments. Also, we checked the levee vulnerability index against the 2015 flood of the Kinu river and proved that the risk of breach of levee back slope increased in the flood falling stage.