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Total horizontal and vertical forces of irregular waves on partially perforated caisson breakwaters
Authors:Yong Liu  Yucheng Li  Bin Teng  Junjie Jiang  Baolian Ma
Affiliation:1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, PR China;2. R&D Center for Civil Engineering Technology, Dalian University, Dalian 116622, PR China;3. Planning & Designing Institute of Water Transportation, Beijing 100007, PR China;4. Tianjin Maritime Safety Administration, Tianjin 300456, PR China
Abstract:In this study, the total horizontal and vertical forces as well as the phase differences of irregular waves on a partially perforated caisson breakwater are investigated. The partially perforated caisson is located on a rubble fill foundation and filled with rock. Based on linear potential theory, a simple semi-analytical solution of the present problem is developed by means of the matched eigenfunction method and the finite element method. Experimental tests are also conducted to validate the theoretical model and examine the wave forces acting on the perforated caisson. The effects of some of the main factors on the total wave forces and the phase difference are examined. Theoretical and experimental studies show that when the total horizontal force reaches its peak, the simultaneous total vertical (upward) force is rather small or even becomes downwards. This is due to the existence of an obvious phase difference between the time histories of the total horizontal and vertical forces, which is an important advantage of perforated caissons over traditional structures.
Keywords:Partially perforated caisson   Irregular wave   Horizontal force   Vertical force   Phase difference
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