往復流による橋脚周辺の局所洗掘に関する研究

Abstract

In order to anticipate various aspects of local scouring phenomena around abridge pier, a dynamic and flexible model will be necessary which reflects theessence of the phenomena. Such a model was constructed considering tractive forcedue to horseshoe vortex, geometrical similarity of scour hole and mass balance ofsediments in the scour hole. The model explained the feature of scouring processwhich has been observed in flume experiments under oscillatory flow conditions, such as scouring and deposition of scour hole associated with the change of flowdirection. The model was considered useful for rough estimation of maximum scourdepth at least.