Three-dimensional analysis of submerged, moored, horizontal, rigid cylinders used as breakwaters

Wave attenuation by moored cylinders is considered. The cylinders are submerged with their axes horizontal. Linear potential theory is applied. Three-dimensional motions of the cylinders subjected to normal and oblique monochromatic waves are determined using potential theory and a boundary integral method. Each cylinder has length 9.1 m (30 ft) and radius 1.5 m (5 ft), with its top 1.5 m (5 ft) below the still water line and its bottom 3.0 m (10 ft) above the seabed. Free-surface elevations are obtained for a single cylinder and for two cylinders in series. These configurations are effective wave barriers for a range of wave frequencies and incident angles.

[1]  D B Jones.  TRANSPORTABLE BREAKWATERS--A SURVEY OF CONCEPTS , 1971 .

[2]  John R. Headland,et al.  DYNAMIC ANALYSIS OF FLOATING BREAKWATER MOORING SYSTEMS , 1991 .

[3]  Do-Sam Kim,et al.  Dynamic Behavior of Tautly Moored Semi-Submerged Structure with Pressurized Air-Chamber and Resulting Wave Transformation , 1991 .

[4]  Stephen H. Salter,et al.  Power from sea waves , 1974 .

[5]  J. N. Newman.  Algorithms for the free-surface Green function , 1985 .

[6]  Vallam Sundar,et al.  Mooring forces and motion responses of pontoon-type floating breakwaters , 1998 .

[7]  M Hordyk,et al.  HARNESSING SEA WAVE ENERGY BY A SUBMERGED CYLINDER DEVICE. , 1982 .

[8]  A. G. Abul-Azm,et al.  Dual pontoon floating breakwater , 1997 .

[9]  E. Lo.  Flexible Dual Membrane Wave Barrier , 1998 .

[10]  Tokuo Yamamoto.  Moored floating breakwater response to regular and irregular waves , 1981 .

[11]  Lyndell Z. Hales.  Floating breakwaters : state-of-the-art literature review / by Lyndell Z. Hales. , 1981 .

[12]  D. V. Evans,et al.  ACTIVE DEVICES FOR THE REDUCTION OF WAVE INTENSITY , 1989 .

[13]  J P Davis.  WAVE ENERGY ABSORPTION BY THE BRISTOL CYLINDER - LINEAR AND NON-LINEAR EFFECTS. , 1990 .

[14]  Raymond H. Plaut,et al.  Three-dimensional analysis of wave attenuation by a submerged, horizontal, bottom-mounted, flexible shell , 1999 .

[15]  A. N. Williams.  Floating Membrane Breakwater , 1996 .

[16]  A. N. Williams,et al.  A Dynamic Submerged Breakwater , 1996 .

[17]  Harald D. Frederiksen,et al.  Wave Attenuation by Fluid Filled Bags , 1971 .

[18]  S. T. Kee,et al.  Flexible Membrane Wave Barrier. II: Floating/Submerged Buoy-Membrane System , 1997 .

[19]  P. Vethamony,et al.  Wave attenuation characteristics of a tethered float system , 1995 .

[20]  D. V. Evans,et al.  Submerged Floating Breakwaters , 1991 .

[21]  L. Natale,et al.  Discussion of Motion Response and Wave Attenuation of Linked Floating Breakwaters by Iraklis A. Valioulis , 1992 .

[22]  H. Barlow.  Surface Waves , 1958, Proceedings of the IRE.

[23]  S. T. Kee,et al.  Performance of Dual Flexible Membrane Wave Barriers in Oblique Waves , 1998 .

[24]  K. Murali,et al.  Performance of Cage Floating Breakwater , 1997 .

[25]  C. Brebbia,et al.  Boundary Elements IX , 1987 .

[26]  Bruce L. McCartney.  Floating Breakwater Design , 1985 .