An Experimental Study on Local Scour According to Pier Size and Attack Angle

In this paper, the local scour depth according to bridge piers of attack angle and pier sizes for semi-circular pier shapes was studied by laboratory flume experiments. The effects of scour depth according to another pier size and attack angle in the same opening ratio also discussed. The experiments operated that increased to slope and flow depths in terms of attack angle. The flume slope was carried that increased with 0.01%, 0.03%, 0.05%, 0.1%, 0.2%, and 0.4%. And the angle of attack were operated with , , , , and . To investigate the effects of opening ratio and attack angle. the experiments were also performed same projected pier widths to varied for angle of three size pier for , , and on pier size orders. The results of the experiments show that the maximum scour depth increased not only increasing flume slope and Froude number with same attack angle, but also increasing attack angle with same flume slope. The comparison shows that relative difference exist between another pier size and that obivously reveal larger scour depth at skewed flow direction than parrallel flow direction.