EXPERIMENTAL STUDY ON REDUCTION OF LOCAL SCOUR DUE TO VARIOUS SCOUR PROTECTION AROUND PIER

Abstract

 An extremely heavy rainfall caused huge flood disaster including the collapse of river bridges. Most of the factors are local scouring around the piers, and future maintenance of the piers and appropriate scouring measures are major issues. This study aims to clarify the effect on the reduction effect of scouring around the pier. For this, we conducted small-scale model experiments using various scour protection like block method, bag-shaped riprap method, and steel sheet pile method. As a result, the bag-shaped riprap method can have high scouring resistance compared to other scouring measures. It is also found that the scouring countermeasures work can be sufficiently effective only by constructing the scouring countermeasures on the upstream side of the pier.