An experimental study on scale effects in wave reflection of low-reflective quay walls with internal rubble mound for regular and random waves

Abstract Physical model tests at small and large scales have been carried out to assess the influence of the model scale on the wave reflection of low-reflective quay walls consisting in prefabricated caissons with frontal openings and internal rubble mounds. Both monochromatic and random waves have been modeled. The experiments have been carried out in the small and large scale facilities at Laboratori d'Enginyeria Maritima of the Universitat Politecnica de Catalunya, in Barcelona. The approach described in Burcharth et al. (1999) for the treatment of scale effects for porous flows has been applied to scale down the nominal diameter of the grain material at small scale (1:33). The results with and without correction of scale effects have been compared with large scale ones (1:4). However, there is not plenty of literature on wave reflection of such kind of structure: Matteotti (1991) and Faraci et al. (2012) carried out physical model tests for configurations similar to the one analyzed in the present work. Altomare et al. (2013a) applied an innovative data-driven modeling technique to analyze the relationship between wave reflection and hydraulic-geometrical parameter for random waves, basing the analysis on the results from small scale tests. A discussion on similarity or differences with the mentioned studies has been conducted confirming that the approach proposed by Burcharth et al. (1999) led to more accurate results. The main aim of the present work is to provide a reliable description of the behavior of such structure exposed to the wave actions, considered remarkable since a similar quay can be implemented as berthing structure inside the harbors. The paper underlines the importance of the treatment of the scale effects in such kind of modeling and the choice of a proper model scale. Finally a new equation to evaluate the reflection coefficient of such kind of structures is proposed.

[1]  Gregorio Iglesias,et al.  Artificial intelligence applied to plane wave reflection at submerged breakwaters , 2011 .

[2]  D. Savić,et al.  A symbolic data-driven technique based on evolutionary polynomial regression , 2006 .

[3]  P. A. D. Bird,et al.  A new non-dimensional number for the analysis of wave reflection from rubble mound breakwaters , 1996 .

[4]  Kazuki Oda,et al.  SCATTERING OF WATER WAVES BY VERTICAL CYLINDERS WITH A BACKWALL , 1993 .

[5]  N.W.H. Allsop,et al.  REFLECTIONS FROM COASTAL STRUCTURES , 1988 .

[6]  Ching-Piao Tsai,et al.  Wave reflection from vertical breakwater with porous structure , 2006 .

[7]  J. V. Smallman,et al.  A mathematical model of a slotted wavescreen breakwater , 1992 .

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

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

[10]  Hideo Kondo,et al.  Analysis of Breakwaters having Two Porous Walls , 1979 .

[11]  Peter A. Troch,et al.  An improved calculation model for the wave-induced pore pressure distribution in a rubble-mound breakwater core , 2012 .

[12]  P. Klinting,et al.  Evaluation of scale effects in hydraulic models by analysis of laminar and turbulent flows , 1983 .

[13]  Luca Cavallaro,et al.  WAVE REFLECTION GENERATED BY CAISSONS WITH INTERNAL RUBBLE MOUND OF VARIABLE SLOPE , 2012 .

[14]  M. Miche.  Le pouvoir réfléchissant des ouvrages maritimes exposés à l'action de la houle , 1951 .

[15]  Corrado Altomare,et al.  Wave reflection: small and large scale experiments on wave absorbing quay walls , 2013 .

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

[17]  Shigeo Takahashi,et al.  PERFORMANCE EVALUATION OF PERFORATED-WALL CAISSONS BY VOF NUMERICAL SIMULATIONS , 2003 .

[18]  Josep R. Medina,et al.  STUDY OF REFLECTION OF NEW LOW-REFLECTIVITY QUAY WALL CAISSON , 2011 .

[19]  Steven A. Hughes,et al.  Estimating Wave-Induced Kinematics at Sloping Structures , 1995 .

[20]  X. Gironella,et al.  Evolutionary data-modelling of an innovative low reflective vertical quay , 2013 .

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

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

[23]  Reflection and transmission of regular waves at a surface-pitching slotted barrier , 2007 .

[24]  Ralph H. Cross,et al.  SCALE EFFECTS IN RUBBLE-MOUND BREAKWATERS , 1972 .

[25]  J. Medina,et al.  ANTIREFLECTIVE VERTICAL STRUCTURE EXTENDED FOR ATTENUATION OF LOW FREQUENCY WAVES , 2012 .

[26]  G Matteotti.  THE REFLECTION COEFFICIENT OF A WAVE DISSIPATING QUAY WALL , 1991 .

[27]  Peter A. Troch,et al.  Scaling of Core Material in Rubble Mound Breakwater Model Tests , 1999 .

[28]  Steven A Hughes,et al.  PHYSICAL MODELS AND LABORATORY TECHNIQUES IN COASTAL ENGINEERING , 1993 .

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

[31]  Takeshi Ijima,et al.  PERMEABLE SEAWALL WITH RESERVOIR AND THE USE OF "WAROCK" , 1976 .