LARGE-SCALE HYDRAULIC EXPERIMENTS ON EROSION DISASTERS IN GRAVEL BED RIVERS - THE DISASTER PROCESS OF SCOURING OF THE BACKSIDE OF THE LOW-WATER REVETMENT LEADING TO LEVEEE EROSION AND VERIFICATION OF COUNTERMEASURES -

Abstract

 In the gravel bed rivers, levee disasters caused by erosion occur frequently, regardless of over-flow. Particularly in curved sections of the river channel, we observe disasters where erosion of the backside of the low-water revetment leads to levee erosion. This study focuses on the levee eroison occurring on the outer side of the curved sections of the river channel, where the risk of that is high. We reproduced the levee erosion during flooding through large-scale hydraulic experiments, elucidated the process of erosion disaster progression, and verified the effectiveness of countermeasures based on that disaster process.