Abstract
This study investigates two effective measures that reduce a wave overtopping at the joint corner between flaring shaped seawall and upright one. One is an overhanging on the crown of the flaring shaped seawall, and the other is the bulkhead on the seawall section. Hydraulic experiments are carried out with a plane basin. This study confirmed that the overhanging section effectively reduces the wave overtopping at the joint corner. The bulkhead with slits improves the function of the overhanging. The overhanging with bulkhead reduces the wave overtopping rate less than the case of straight levee normal of the seawall. This countermeasure also reduces the wave overtopping at the joint corner on the upright seawall side. The maximum wave pressures on the overhanging and bulkhead are less than two times of hydrostatic pressure corresponded to an incident wave height. The pressure distributions are similar on each section. No impulsive wave pressure profiles can be observed on the overhanging and bulkhead.
