2006 Volume 12 Pages 55-60
For the flood control measures in a steep channel, to understand the effect of the bed material on the river-bed variation and to estimate the inundation discharge by dyke breach are important. In this study we carried out the field experiment about river-bed variation and inundation by dyke breach in the field of the Joganji River which is a very steep channel. We clarify the characteristics of the river-bed variation and the grain size group which controls the stability of river-bed. Furthermore we affirm the role of the gain size distribution on the river-bed variation by comparing with the result of the field experiment on the Joganji River in 2004. Finally we performed the field experiment estimating discharge hydrograph due to dyke breach and propose a reasonable method to estimate the inundation discharge by dyke breach and verify the applicability of the method from the result of the field experiment.
