The performance characteristics of inclined highly pervious pipe breakwaters

This study investigates highly pervious dense pipes with small apertures, which benefit convection and the interchange of seawater within harbor districts and provide effective wave absorption. Additionally, this study explored the problems of wave impacts on the inclined state of highly pervious pipe obstacle, the energy dissipation characteristics for a series of inclined pipe breakwaters, and the relationship between the inclination angle and the dissipation effect. Pipe breakwaters were arranged in diverse angles of inclination. Forward inclination replicated the effects of a concave embankment, and backward inclination replicated the inclined plane of a sloping revetment. Physical experiments were conducted to investigate the influence that various apertures and inclined angles have on reflection coefficient, transmission coefficient, and loss coefficient. The results show that the influence of highly pervious inclined permeable breakwaters varies according to the effect of minimum reflectivity. The attenuation of long waves is ineffective compared to the efficacy for short waves. Lengthening the pipe enhances the effects of attenuation more compared to shifting the inclination angle, and shifting the inclination angle enhances the effects more than enlarging the aperture.

[1]  S. Neelamani,et al.  Surface roughness effect of vertical and sloped seawalls in incident random wave fields , 2005 .

[2]  S. Neelamani,et al.  Wave interaction with twin plate wave barrier , 2006 .

[3]  Hee Min Teh,et al.  Hydrodynamic Characteristics of a Free-Surface Semicircular Breakwater Exposed to Irregular Waves , 2012 .

[4]  A. Hegde,et al.  Performance Characteristics of Horizontal Interlaced Multilayer Moored Floating Pipe Breakwater , 2007 .

[5]  S. Itoh,et al.  WAVE INDUCED FLOW AROUND SUBMERGED SLOPING PLATES , 1995 .

[6]  Atilla Bayram.  Experimental study of a sloping float breakwater , 2000 .

[7]  A. Koraim,et al.  Hydrodynamic performance of double rows of piles suspending horizontal c shaped bars , 2014 .

[8]  Zhenghua Huang.  An experimental study of wave scattering by a vertical slotted barrier in the presence of a current , 2007 .

[9]  Subba Rao,et al.  Wave transmission and reflection for two rows of perforated hollow piles , 2002 .

[10]  Ruey-Syan Shih,et al.  Experimental study on the performance characteristics of porous perpendicular pipe breakwaters , 2012 .

[11]  Vallam Sundar,et al.  Dynamic pressure and run-up on curved seawalls compared with vertical wall under cnoidal waves , 2010 .

[12]  Srinivasan Alavandar,et al.  Neuro-fuzzy based approach for wave transmission prediction of horizontally interlaced multilayer moored floating pipe breakwater , 2011 .

[13]  M. S. Kirkgöz,et al.  Breaking wave impact on vertical and sloping coastal structures , 1995 .

[14]  Soon Keat Tan,et al.  Nonlinear scattering of non-breaking waves by a submerged horizontal plate: Experiments and simulations , 2009 .

[15]  Vengatesan Venugopal,et al.  HYDRODYNAMIC PERFORMANCE OF A FREE SURFACE SEMICIRCULAR PERFORATED BREAKWATER , 2011 .

[16]  Xiping Yu,et al.  Functional Performance of a Submerged and Essentially Horizontal Plate for Offshore Wave Control: A Review , 2002 .

[17]  Zhenxiang Sun,et al.  Experimental study of a porous floating breakwater , 2010 .

[18]  Y. Goda,et al.  ESTIMATION OF INCIDENT AND REFLECTED WAVES IN RANDOM WAVE EXPERIMENTS , 1976 .

[19]  Vengatesan Venugopal,et al.  PERFORMANCE ANALYSIS OF COMPOSITE SEMICIRCULAR BREAKWATERS OF DIFFERENT CONFIGURATIONS AND POROSITIES , 2012 .

[20]  S. Neelamani,et al.  Wave transmission and reflection characteristics of a partially immersed rigid vertical barrier , 1992 .

[21]  A. Hegde,et al.  Mooring forces in horizontal interlaced moored floating pipe breakwater with three layers , 2008 .

[22]  Subba Rao,et al.  Physical model studies on wave transmission of a submerged inclined plate breakwater , 2009 .

[23]  A. S. Koraim,et al.  The hydrodynamic characteristics of a single suspended row of half pipes under regular waves , 2012 .

[24]  A. Koraim.  Hydrodynamic efficiency of suspended horizontal rows of half pipes used as a new type breakwater , 2013 .

[25]  M. Reddy,et al.  Wave forces on a vertical cylinder defenced by a perforated vertical and inclined barriers , 2002 .

[26]  E. H. Tabet-Aoul,et al.  Fixed absorbing semi-immersed breakwater , 2003 .

[27]  J. S. Mani,et al.  Wave Transmission by Suspended Pipe Breakwater , 1995 .