| In many rivers throughout the country, sediment has been flashed away due to proceed of river bed degradation and local scouring on bedrock causes damage the decrease of stability, deformation and rolling at the river structures. It was reported that the lack of safety by erosion around pier foundations in Ishikari river and Tama river. Besides, the bridges were declined by local scouring around pier foundation
in Totsuta river and Shikaribetsu river. In this study, we conducted the flume experiments to clarify the local erosion phenomena around the piers and to understand the effect of countermeasures for preventive maintenance. The results suggested that the bedrock erosion mechanism is different from the erosion mechanism of alluvial bed. Furthermore, the results demonstrated a suitable countermeasure method for suppressing bedrock erosion around pier. |
