Abstract
In the present study, temporary variation of bed morphology around the Gudo point near the Shimanto-bridge at 9.5km upstream from the river mouth of Shimanto River of Shikoku-island in Japan, were surveyed in detail to discuss the local scouring between bridge piers existing in the right bank side of the river. The scouring has progressed for a long period and it becomes the serious problem concerning with stability of river constructions. Also, an underwater TV camera was used to observe the inside of deep scoured hole. In addition, bricks were filled up under the ground at upstream and left-hand side of the bridge pier to measure the maximum scouring depth in the spot. Then, the small scouring was occurred and the bricked were carried away due to the floods.
