Abstract
Several types of the artificial reefs were designed as countermeasure against erosion and wave overtopping in Niigata coast, using a hydraulic model test with movable bed. We used a large-sized water tank (30m in width, 40m in length, and 4m in depth). The model scale was 1/100. It was found that the shoreline change was restrained by the artificial reef located between the breakwaters of the head-land, and also the artificial reef with a small channel on the center or that with the several opening parts had the effect that sediment surrounded by the head-lands is restrained from moving offshore over the artificial reef.
