The Investigation of Submerged Breakwater Influence on Its Coastal Profile Behind

The submerged breakwater is one coastal erosion countermeasure. Even the breakwater height is below the seawater surface, and it may reduce the wave height in a certain amount. The less wave height makes the coastal behind breakwater will be protected. This research performed the investigation of submerged breakwater influence by using the physical model. It used the wave flume, which has a dimension of 4.0 x 0.25 x 0.08 m (LxHxW). Due to the small flume, the research objective is to investigate the submerged breakwater influence on its coastal profile behind. The breakwater variations are on its width and freeboard height. The wave has a 2.0 cm high and 0.71 second period. The sediment particle has 0.2 - 0.3 mm diameter, and the profile slope is 1:4. After several incoming waves, the profile change behind the breakwater was measured and analysed. The results showed that the wider of a breakwater and the smaller of freeboard height would make the smaller change on coastal profile behind.