||In the last few decades, the purpose of coastal protection is no longer in forbidding overtopping, but allowing appropriate amount of wave overtopping with drainage facilities to mitigate the likely flooding. Therefore, the amount of wave overtopping is an important indicator in the seawall design. There were numerous scholars who studied wave overtopping, performed extensive hydraulic flume experiments, and proposed empirical formulas to predict overtopping. However, the wave conditions employed were having mostly different wave heights with the same wave period, in order to investigate the effect between the height of freeboard and wave heights on overtopping. Due to the fact that larger wave height may often associated with longer wave period, so the wave period must be included in the empirical formulas for wave overtopping. In addition, previous studies were mostly aimed at vertical and single slope seawalls, seldom considered the behavior of the bermed seawalls with crown wall.|
The purpose of this study is to perform laboratory experiments on the overtopping at the western seawall at Kaohsiung Nan-Sing Marina Industrial Park, subject to storm waves with 4 types of return period and 2 types of high water level, together with 6 kinds of wave absorbing arrangement. The data obtained are then compared using empirical formulas and the new parameters developed in this study to predict the overtopping over the bermed seawall. Our results reveal that the wave overtopping amount caused by 10-year-return-period storm waves at HHWL could equal to a 50-year-return-period storm waves at HWL on the bermed seawall in Kaohsiung area.