Abstract
Since the local scour, which occurs at the foot of the structure for controlling the drift sand and the flow, greatly affect the stability of the structure, the appropriate countermeasure should be taken based on the prediction of scale of the scour. In this study, the flow and sand migration phenomena formed in the vicinity of the vertical flat plate were observed in detail by using a high speed camera and the effect of the height of the vertical plate on the characteristics of the local scour at the foot of the plate was investigated in hydraulic experiment. On the basis of the observation the mechanisms of the occurrence of scour was inferred. Further the countermeasures of penetration of the vertical plate into sand bed and embankment at the foot of the vertical plate were proposed and the effectiveness of them were investigated.
