Abstract
On Makuhari Beach located in Tokyo Bay, artificial beach was built in front of the reclaimed land in the 1980s, and this beach has been widely used for recreation. However, the beach was gradually eroded. In 2009, a groin was extended in the middle of the beach and gravel with grain size of d = 50mm was nourished by 12000m3 between the jetty and this central groin. Although artificial beach was produced in parallel to the seawall line, nourishment gravel was transported northward and was deposited to form a high berm. In this study, the movement of nourishment gravel was measured by field observation.
