A method to study interactions between narrow-banded random waves and multi-chamber perforated structures

A time-domain method, based on linear velocity potential theory, is presented to study the interaction between narrow-banded random waves and perforated structures. A simple relation is derived to estimate the jet length of flows through the perforated wall. The reflection coefficient of narrow banded random waves from perforated structures is calculated by assuming a Rayleigh distribution of the heights of incident random waves. For reflection of narrow-banded waves from a single-chamber perforated breakwater, a comparison of the predicted and measured reflection coefficients shows that the method presented in this paper can provide a prediction better than that of regular waves. Numerical results are also reported on the reflection of narrow-banded waves from multi-chamber perforated breakwaters.

[1]  Ralph H. Cross,et al.  WAVE TRANSMISSION THROUGH PERMEABLE BREAKWATERS , 1972 .

[2]  C. Mei.  The applied dynamics of ocean surface waves , 1983 .

[3]  Yoshimi Goda,et al.  Random Seas and Design of Maritime Structures , 1985 .

[4]  Subrata K. Chakrabarti,et al.  Hydrodynamics of Offshore Structures , 1987 .

[5]  Robert A. Dalrymple,et al.  Reflection and transmission from porous structures under oblique wave attack , 1991, Journal of Fluid Mechanics.

[6]  L. Natale,et al.  Hydraulic Design of Perforated Breakwaters , 1992 .

[7]  P. Liu,et al.  Scattering of Water Waves by Vertical Cylinders , 1993 .

[8]  Xiangzhan Yu,et al.  Diffraction of Water Waves by Porous Breakwaters , 1995 .

[9]  Sheldon M. Ross.  Introduction to Probability Models. , 1995 .

[10]  Kyung-Duck Suh,et al.  Wave reflection from perforated-wall caisson breakwaters , 1995 .

[11]  Allen T. Chwang,et al.  INTERACTION BETWEEN POROUS MEDIA AND WAVE MOTION , 1998 .

[12]  M. Isaacson,et al.  Wave Interactions with Vertical Slotted Barrier , 1998 .

[13]  M. Ochi.  Ocean Waves: The Stochastic Approach , 1998 .

[14]  Kil Seong Lee,et al.  Reflection of irregular waves from perforated-wall caisson breakwaters , 2001 .

[15]  Allen T. Chwang,et al.  Investigations on the reflection behaviour of a slotted seawall , 2001 .

[16]  Guo-Hai Dong,et al.  The reflection of oblique incident waves by breakwaters with double-layered perforated wall , 2003 .

[17]  Bin Teng,et al.  Interaction of oblique waves with infinite number of perforated caissons , 2004 .

[18]  Woo Sun Park,et al.  Wave reflection from partially perforated-wall caisson breakwater , 2006 .