2 正会員 工博 寒地土木研究所寒地河川チーム(〒062-7602 北海道札幌市豊平区平岸1条3丁目) 3 正会員 工博 一般財団法人北海道河川財団(〒060-0807 北海道札幌市北区北7条西4丁目5-1) 4 非会員 一般財団法人北海道河川財団(〒060-0807 北海道札幌市北区北7条西4丁目5-1) It is important mitigating flood damage by overflow from a levee breached. Damage mitigation can be expected by temporarily closing the levee breach and reducing the amount of flood water exiting the breach. However, the method has not been clarified. We collected cases of breach closure at the time of disaster, and conducted experiment on

more »

... od defense methods. We showed to clarify the effect of channel width and channel bed profile on levee breach processes by using a numerical model to simulate levee breaches based on results of the experiments. And we showed the idea of damage mitigation measures.