Numerical Simulation of a Rising Seawall for Coastal Flood Protection

Abstract

The no-energy and no-operation rising seawall (NEORISE) is a new type of structure for protection against tsunamis and coastal flooding. It is installed in a gap in flood defenses and usually rests on land. It can close the gap when a tsunami occurs owing to its buoyancy during inundation. It requires no additional operations or external power sources. If a high-velocity flow such as the run-up of tsunamis reaches the NEORISE, some overtopping will occur before it can close the gap. The authors evaluate overtopping quantities in NEORISE structures through numerical simulations and hydraulic experiments. The numerical model was built using a transformable overset grid method that is used to study the fluid-structure interaction and a level set method that captures the interface between two fluids. The hydraulic experiments were carried out using a