| Numerous spur-dikes and groins had been installed to prevent bank erosion, or to adjust and stabilize 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, 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, flume experiments with movable-bed are conducted in order to discuss characteristics of bed deformation around submerged groins for diferent horizontal angle. In results, the fundamental effect of groin angle is observed. As the angle become large, local scour around the tip of groin become minimum. Furthermore, it is shown that scour volume is largely reduced by devising the shape of the groin. |
