| The purpose of this study is to evaluate countermeasures of mitigating levee breach progress and reducing[*]overflow rate. The concept of the countermeasure is to utilize concrete blocks installed on the levee ahead of[*]breaching and expect these blocks to be collapsed and protect the edge of the breached levee. Upon considering this[*]concept、 authors referred to the findings of previous side-overflow breach experiments performed in the Chiyoda[*]experiment flume、 where the mechanism of breach process was clarified under highly reliable observation conditions.[*]Therefore authors performed levee breach experiments in the 1/20 scale model of the Chiyoda experiment flume for[*]various conditions、 such as installation locations、 numbers、 or arrangements of the blocks[*] The experimental results highlighted the behavior of the collapsed blocks、 effectiveness for mitigating the breach[*]progress、 and hydraulic characteristics around blocks. Considerations such as the optimal arrangement of blocks and[*]the number of blocks to be used were also clarified. |
