EFFECT OF WIND TO WAVE-OVERTOPPING AND WATER SPRAY ON NON WAVE-OVERTOPPING TYPE SEAWALL IN DEEPWATER

Abstract

The effect of wind to wave-overtopping and water spray transportation behind theseawall was investigated with the Non Wave-Overtopping Type Seawall. It is confirmed that even for the strong wind, the seawall is effective for preventing wave-overtopping compared to the conventional upright seawall. But, as the wind velocity increases, the wave-overtopping rate increases and water spray was transported far and widely. In addition, a parapet was installed on the tip of the seawall as one of countermeasures of water spray, and its effect was investigated. Itis found that the parapet is not so effective for reducing water spray, but it can prevent overflowing of water mass into just behind the seawall. It is also found that the parapet of about 1m in height reduces the wave-overtopping rate from 30 percent to 40 percent even under strong wind.