Characteristics of Wave Overtopping on Vertical Type Seawall Covered with Wave-dissipating Blocks

In recent years, seawalls coated with wave-dissipating blocks heve been set in front of upright seawalls. However, wave overtopping on this type of seawall is not fully investigated. Therefore, in this paper, characteristics of wave overtopping on upright seawall covered with wave-dissipating blocks was examined experimentally. From the results, it is found that this type of seawall is effective to reduce the wave overtopping rate. The crest height of the seawall is less than the height in upright seawall case to get the same wave overtopping rate. In addition, an easy method to estimate the runup height on the seawall has been suggested.