Experiments of perforated breakwater with a wave-absorbing chamber

• Main Authors: Jian-Chih Lin, 林建志
• Other Authors: Ching-Piao Tsai
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/62110251445528948917

碩士 === 國立中興大學 === 土木工程學系所 === 98 === In this thesis, a series of experiments were conducted for the investigations of the wave characteristics in front of a caisson breakwater with wave-absorbing chamber. The perforated wall of the wave chamber consists of sloping-slit in the upper part and vertical-slit in the lower part. In the experiments, both the time history of wave profiles and the wave pressures at the wall of caisson were measured, and compared with the numerical simulations using CFD code, Flow-3D. The experimental results show in very good agreement with the numerical results. The wave reflection from the breakwater and the wave pressure distribution on the wall were analyzed. Due to energy dissipation induced by the wave chamber, it was found that not only the wave reflection was reduced but the wave pressure was also reduced. The results showed that the wave reflection decreased with the relative width of the wave chamber to a minimum value then increased, for a fixed porosity of the perforated wall. For a fixed relative width of the wave chamber, the wave reflection decreased with the incident wave steepness. But the maximum wave pressure on the wall at the mean water level increased with the incident wave steepness.