Abstract
The horizontal wave force acting on vertical walls of perforated caisson breakwater was experimentally investigated in this study. The maximum horizontal wave force acting on single and double chamber caisson was measured respectively and compared each other. By analyzing the obtained experimental data, it was clarified that the total horizontal wave force for double chamber caisson was 9% smaller on average than that for single chamber caisson when the total chamber width was the same for both caissons. The reason for such reduction of horizontal wave force on the double chamber caisson is found from additional dissipation of wave energy at the porous middle wall of the structure, by which rather impulsive wave force on the rear wall could be slightly diminished compared to the single chamber caisson.
Highlights
In Korea, newly constructed breakwaters in major ports are located in somewhat deep waters so that corresponding design wave height and period become greater than in the past
In this study, we measured the horizontal wave force acting on vertical walls consisting of the single or double chamber caisson by performing physical experiments in a wave flume
Based on the analysis method suggested by Takahashi and Shimosako (1994), the wave force acting on each of the vertical walls were analyzed separately with considering the specific wave phases that is closely related to the maximum force on the front, middle, or the rear walls of the caisson
Summary
In Korea, newly constructed breakwaters in major ports are located in somewhat deep waters so that corresponding design wave height and period become greater than in the past. Crest IIa and IIb indicates the phases when the force on the wave chamber rear wall reaches an impulsive and pulsating quasi-static peak, respectively At each of these different wave phases, Takahashi and Shimosako (1994) compared the measured wave force on vertical walls of the perforated caisson with the well-known Goda’s formula (Goda, 2010). The force on the rear wall shows two peaks corresponding to impulsive wave action (Crest IIa) and pulsating loading (Crest IIb) on the wall Phase of Crest IIa as shown in the last panel of Figure 6, but its magnitude is slightly smaller compared to the corresponding value for the single chamber caisson shown in the previous figure
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