Reproducibility of Hydraulic Experiment on Dyke Breach due to Overflow and Influence of Dike Cross Section Profile to the Breach

Abstract

It is very important subject for the flood disaster prevention and reduction to understand the mechanisms on the breach of flood levee. However, since the phenomenon arises suddenly, the detailed observation of the breach is very difficult. In order to clarify the phenomenon on breach of flood levee, a small-scale hydraulic model experiment needs to be carried out. In this research, we tried to reproduce the result of the actual size hydraulics model test on the breach using the small-scale hydraulic experiment. As a result, it is found that although the reproducibility of the phenomenon in early stages of overflow is low, the reproducibility of the stage where the breach progresses is very high. The experiments to which the closs section profil of the levee was changed were conducted. It became clear that the erosion of foot of flood levee had big influence on the whole erosion phenomenon.