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论文类型：会议论文

发表时间：2007-01-01

收录刊物：CPCI-S

页面范围：73-76

摘要：Recently vertical perforated wall breakwaters have been often used in coastal engineering for harbor and coastline protection construction as they can effectively reduce both the wave forces acting on and the wave reflection from the structures. Generally, a perforated wall breakwater consists of a perforated front wall, a solid back wall and a wave absorbing chamber between them. In practice, partially perforated wall breakwaters are more often used due to the stability requirements of the structures. In this study, a partially perforated wall breakwater with an internal submerged horizontal porous plate is proposed and studied. The horizontal porous plate is suggested to enhance the wave absorbing performance and the stability of the structure. An analytical solution based on the linear potential theory is developed to assess the wave absorbing capacity of the new structure. According to the components of the breakwater, the whole fluid domain is divided into three sub-domains, and the velocity potential in each domain is obtained by means of the matched eigenfunction method. Then the unknown expansion coefficients are obtained by matching the boundary conditions on the front wall, and the reflection coefficient are subsequently determined. The present numerical results for limiting cases are exactly the same to the previous predictions of a fully perforated wall breakwater with a submerged horizontal solid plate (Yip and Chwang, 2000) and a partially perforated wall breakwater without the internal horizontal plate (Li et al., 2002). Numerical results show that with suitable geometrical porosities of the perforated front wall and the horizontal porous plate, the reflection coefficient will be always small if the relative wave absorbing chamber width (distance between the front and back walls versus incident wavelength) exceeds a certain small value.