UNDERSTANDING OF THE FAILURE CAUSED BY THE RIVER-BED DEGRADATION USING MOVABLE BED HYDRAULIC MODEL EXPERIMENT AND PARTICLE METHOD

Abstract

In this study, the phenomenon that bed protection works are washed away from the downstream end is confirmed by movable bed hydraulic model experiment and numerical analysis, and the failure factor is extracted. A fluid-rigid body coupled model corresponding to the experiment is developed taking into account the interaction between flow conditions and a bed protection work. The E-MPS (Explicit Moving Particle Simulation), which is one of the particle methods, is implemented for the developed model. The numerical and experimental results show that the failure of bed protection works can be reproduced using the E-MPS. In addition, their failure limits are evaluated using several combinations of unit width flow rate and riverbed reduction amount for the developed model.