Abstract
Numerous spur-dikes and groins had been built for the purpose of preventing bank erosion, or stabilizing channel alignments. In each purpose, groin angle and arrangement has been studied comprehensively through past studies. It is known that horizontal angle of groin has different influence on riverbed deformation. In this study, flume experiments with movable-bed are conducted in order to discuss characteristics of bed deformation around submerged groins for different horizontal angle for the purpose of finding the fundamental shapes of the submerged groin which are suitable for channel stabilization of the small and medium-sized rivers in Japan. In results, the fundamental effect of groin angle is observed. As the angle becomes large, local scour around the tip of groin decreases. Furthermore, it is shown that scour volume is considerably reduced by devising the shape of the groin.
