Effects of vertical wall and tetrapod weights on wave overtopping in rubble mound breakwaters under irregular wave conditions
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Rubble mound breakwaters protect the coastal line against severe erosion caused by wave action. Thisstudy examined the performance of different sizes and properties (i.e. height of vertical wall and tetrapod size) of rubblemound breakwaters on reducing the overtopping discharge. The physical model used in this study was derived based onan actual rubble mound in Busan Yacht Harbor. This research attempts to fill the gap in practical knowledge on thecombined effect of the armor roughness and vertical wall on wave overtopping in rubble mound breakwaters. The maingoverning parameters used in this study were the vertical wall height, variation of the tetrapod weights, initial waterlevel elevation, and the volume of overtopping under constant wave properties. The experimental results showed thatthe roughness factor differed according to the tetrapod size. Furthermore, the overtopping discharge with no verticalwall was similar to that with relatively short vertical walls ( 1 v γ = ). Therefore, the experimental results highlight theimportance of the height of the vertical wall in reducing overtopping discharge. Moreover, a large tetrapod size mayallow coastal engineers to choose a shorter vertical wall to save cost, while obtaining better performance.
Abstract
Rubble mound breakwaters protect the coastal line against severe erosion caused by wave action. Thisstudy examined the performance of different sizes and properties (i.e. height of vertical wall and tetrapod size) of rubblemound breakwaters on reducing the overtopping discharge. The physical model used in this study was derived based onan actual rubble mound in Busan Yacht Harbor. This research attempts to fill the gap in practical knowledge on thecombined effect of the armor roughness and vertical wall on wave overtopping in rubble mound breakwaters. The maingoverning parameters used in this study were the vertical wall height, variation of the tetrapod weights, initial waterlevel elevation, and the volume of overtopping under constant wave properties. The experimental results showed thatthe roughness factor differed according to the tetrapod size. Furthermore, the overtopping discharge with no verticalwall was similar to that with relatively short vertical walls ( 1 v γ = ). Therefore, the experimental results highlight theimportance of the height of the vertical wall in reducing overtopping discharge. Moreover, a large tetrapod size mayallow coastal engineers to choose a shorter vertical wall to save cost, while obtaining better performance.
참고문헌 (16)
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