COUNTERMEASURES AGAINST SEA LEVEL RISE USING SEAWALL WITH MULTIPLE WAVE OVERTOPPING MEASURES (SMO)

In Japan, there are many seawalls where it is difficult to raise the crown height from the viewpoint of obstacle limitation surfaces at airports and deteriorated landscapes. As a measure to reduce the wave overtopping rate and lower the crest height, a seawall with multiple wave overtopping measures (SMO), which combines a Recurved Parapet (R.P.), a Double Parapet (D.P.), and a Permeable Layer (P.L.). SMO creates a beautiful coastal landscape and is used as a place of relaxation for the neighborhood residents. However, the effect of SMO on reducing wave overtopping rate has not been systematically investigated. Therefore, its applicability to the anticipated increase in wave overtopping rate due to sea level rise is also unclear. In this study, we evaluated the wave overtopping suppression effect of SMO using hydraulic model experiments and numerical simulations.Furthermore, the effect of sea level rise on reducing wave overtopping of SMO was verified by numerical simulation.