Scouring of Sandy Bed Around Curved Seawalls Due to Extreme Wave Events

Coastal erosion is a universal issue and it is primarily due to natural processes and sometimes by anthropogenic activities. Protection of the coast and shore can be accomplished in different ways. Seawall is one of the primary coastal structures to resist the impact of extreme wave events. The structural instability due to sediment transport and scouring is a major problem with rectangular shaped vertical seawall structures since they are least effective in dissipating wave energy and hence turbulence created due to the incoming and overtopping waves induce scouring. Vertical seawalls reflect wave energy seawards but they are the least effective in dissipating wave energy. But the performance of curved seawall is better compared to vertical seawalls from both stability and overtopping point of view. This study examines the scouring near vertical and curved seawalls during extreme wave events. Numerical simulations for finding the scouring near three different seawall geometries (vertical, CPS and FSS) are carried out in REEF3D and it is found that the scouring near FSS type seawall is less compared to other geometries.