河川堤防の決壊に伴う浮遊砂の堆積に関する研究

Abstract

In order to evaluate the degree of risks of flood disasters caused by the river bankbreach, not only the damages of houses to be submerged, destroyed and partially destroyedbut also the damages due to sedimentation of the suspended sediments in flood zones shouldbe taken into account.In this study, a numerical simulation method which was able to demonstrate the onedimensional experimental results concerning with the suspended sediments deposition wasproposed. The two dimensional numerical simulation method extended from the one dimen-sional method was also presented. Both of the calculated and observed shapes of thesuspended sediments depositing area were uni-directional, and they were comparatively ingood agreement each other, while the distribution of the calculated results of the thicknessof the deposits were not in good agreement with experimental ones. The main reason ofthis was speculated from the bed configuration in the experiments that not with standingthe bed-load transportation was active in the experiments, it was not given at the breachpoint as the inflow boundary conditions in the calculation.