Laboratory Measurements of Breaking Wave Impact Pressures on a Slender Cylindrical Member

Slender cylindrical members form the major components of many of the coastal and offshore structures. These members are frequently subjected to breaking wave impact which often resulted in damages and failure of structures. In order to overcome this intricacy, it is essential to understand the physics of the breaking wave impact on offshore structural members and the resulting induced critical stresses. An experimental investigation has been carried out to measure the effect of breaking wave impact on a slender vertical cylinder. Simultaneous qualitative visual observations and quantitative pressure measurements were made to appreciate the impact induced effect. The induced impact pressure on the cylinder varies with the intensity of wave breaking and the relative location of the cylinder. The impact pressure is maximum when the wave profile reaches its maximum steepness just before the crest destabilization. Impact pressure observed due to a severe plunging wave is about nine times higher than due to spilling. The pressure rise time is found to be an important parameter in dictating the nature of impact.

[1]  E. S. Chan,et al.  Deep-water plunging wave pressures on a vertical plane wall , 1988, Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences.

[2]  H. W. Partenscky,et al.  Classification of breaking wave loads on vertical structures , 1993 .

[3]  Hubert Chanson,et al.  Plunging jet characteristics of plunging breakers , 1997 .

[4]  E. Chan,et al.  Laboratory study of plunging wave impacts on vertical cylinders , 1995 .

[5]  H. Oumeraci,et al.  Breaking wave impact force on a vertical and inclined slender pile¿theoretical and large-scale model investigations , 2005 .

[6]  Tom Bruce,et al.  Study of wave impact against a wall with pressure-impulse theory: part 1, trapped air , 2000 .

[7]  Masataro Hattori,et al.  Wave impact pressure on vertical walls under breaking waves of various types , 1994 .

[8]  R A Bagnold,et al.  INTERIM REPORT ON WAVE-PRESSURE RESEARCH. (INCLUDES PLATES AND PHOTOGRAPHS). , 1939 .

[9]  H. Oumeraci,et al.  Review and analysis of vertical breakwater failures — lessons learned , 1994 .

[10]  Mark J. Cooker,et al.  Wave impact pressure and its effect upon bodies lying on the sea bed , 1992 .

[11]  Robert Royal Minikin,et al.  Winds, waves and maritime structures : studies in harbour making and in the protection of coasts , 1950 .

[12]  L. Brosset,et al.  Sloshing and Scaling: Results from the Sloshel Project , 2010 .

[13]  M. Salih Kirkgöz,et al.  AN EXPERIMENTAL INVESTIGATION OF A VERTICAL WALL RESPONSE TO BREAKING WAVE IMPACT , 1990 .

[14]  C. Rajasekaran,et al.  Breaking Wave Impact Pressure on a Vertical Wall , 2010 .

[15]  Tom Bruce,et al.  Wave impact on a wall using pressure-impulse theory. I : Trapped air , 2000 .

[16]  Joachim Grüne,et al.  Wave-Induced Shock Pressures under Real Sea State Conditions , 1988 .

[17]  Gerald Müller,et al.  WATER WAVE IMPACT ON WALLS AND THE ROLE OF AIR , 2005 .