模型実験による氾濫域を含む越流破堤メカニズム検討

抄録

The objectives of this study are not only to verify the reproducibility of the scale model compared with the on-site overflow experiment results at Chiyoda experimental channel in 2009, but also to investigate the mechanism of levee breach caused by the overflows.

A model scale is 1/20. Therefore, the model material size of sand for the riverbed is 0.55mm of average particle diameter, based on actual-size 11mm. By adapting the cohesive material model, the phenomena of the levee breach, such as destructive embankment figures, destructive speed, deformation of riverbed material, are detected.

The results are that 1) measured the upper limit of diversion flows under the extreme levee’s destruction wide-width, and 2) observed and immediately re-filled the flashed hollows of levee’s toe of slope.