The purpose of this study is to establish a design criteria for the downstream end block of the bed protection works in case of riverbed degradation. Through hydraulic experiments, the outflow limit of the block and the fluid force around the block were determined. We compared the experimental results with the current design method, and clarify that the rolling of the block and the safety factor due to the turbulence of the flow should be considered. Furthermore, after confirming that the experiment was reproducible by numerical calculation, we discuss the effects of deformations such as unevenness and scouring on the fluid force acting on the block.
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