2013 Volume 19 Pages 63-68
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.
