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论文类型：期刊论文

发表时间：2008-11-01

发表刊物：OCEAN ENGINEERING

收录刊物：SCIE、EI、Scopus

卷号：35

期号：16

页面范围：1588-1596

ISSN号：0029-8018

关键字：Submerged breakwater; Horizontal plate; Porous plate; Energy dissipation; Transmission coefficient; Uplift force

摘要：This study examines the hydrodynamic performance of a modified two-layer horizontal-plate breakwater. The breakwater consists of an upper submerged horizontal porous plate and a lower submerged horizontal solid plate. By means of the matched eigenfunction expansion method, a linear analytical solution is developed for the interaction of water waves with the structure. Then the reflection coefficient, the transmission coefficient, the energy-loss coefficient and the wave forces acting on the plates are calculated. The numerical results obtained for limiting cases are exactly the same as previous predictions for a single submerged horizontal solid plate and a single submerged horizontal porous plate. Numerical results show that with a suitable geometrical porosity of the upper plate, the uplift wave forces on both plates can be controlled at a low level. Numerical results also show that the transmission coefficient will be always small if the dimensionless plate length (plate length versus incident wavelength) exceeds a certain moderate value. This is rather significant for practical engineering, as the incident wavelength varies over a wide range in practice. Moreover, it is found that the hydrodynamic performance of the present structure may be further enhanced if the lower plate is also perforated. (C) 2008 Elsevier Ltd. All rights reserved.