2024 Volume 80 Issue 18 Article ID: 24-18172
Based on Goda et al.'s (1975) wave overtopping rate estimation chart, we calculated the wave overtopping rate and required crest height when the sea level rises. As a result, the wave overtopping rate increased with sea level rise, and in many cases, the overtopping discharge became 0.04 m3/m/s with a rise of 0.6 m. In particular, for seawalls covered with wave dissipating blocks, when the water depth is shallow, the wave overtopping rate increases rapidly, and a rise of 0.6m exceeds the seawall's disaster limit rate of 0.2m3/m/s. The increase in wave overtopping rate was particularly noticeable when the water depth was shallow at the wave-dissipating seawall. In addition, the increase in wave overtopping rate was more pronounced when the wave period was shorter. Because the crown height of a seawall with a short wave period is relatively low, it is relatively susceptible to the effects of sea level rise. The shallower the installation water depth, the greater the required crown height when the water level rises.
