2024 Volume 80 Issue 18 Article ID: 24-18042
In response to the problems of submerged breakwater installed as a countermeasure against coastal erosion, such as rising water levels behind submerged breakwater and scouring by offshore currents, we proposed a flat plate type submerged breakwater that is a structural form only at the top of the submerged breakwater, and through hydraulic model experiments and numerical experiments, the high wave damping effect and the water level rise suppression effect behind the structure were demonstrated.
As a result, it was confirmed that a flat plate type submerged breakwater with a height similar to the top length of the submerged breakwater can be expected to have a wave dissipation effect similar to that of a submerged breakwater. Furthermore, it was clarified that the water level rise can be suppressed and the offshore flow velocity can be reduced by removing a lower part of the submerged breakwater as tunnel. Although it is possible to reduce the rise in water level with a removal of lower part, from the viewpoint of preventing scouring, it was confirmed that the flat plate type submerged breakwater was particularly effective because the off-shore flow velocity decreases as the increase of removal area.
