Effects of Antifer Placement Methods on Wave Loads Acting on Crown Walls in Shallow Water

Date

2023-9-7

Author

Demir, Furkan

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In this study, the changes in wave forces on the crown walls of rubble mound breakwaters due to different placement methods of antifer units (closed pyramid, irregular and double pyramid) in the armour layer of rubble mound breakwaters are investigated through physical model experiments. In the experiments, the forces acting on the crown wall of a conventional breakwater section were measured under the influence of different irregular wave series in shallow water conditions. The ratio (Rc/Hm0) between the crest height of the breakwater (Rc) and the spectral significant wave height (Hm0) was set to vary between 0.85 and 1.80 in accordance with the literature. In the experiments, different situations were considered, in which the crown wall was fully and partially protected by the antifer units. The experimental measurements show that different antifer placement methods significantly influence the wave pressure distribution and the wave forces on the crown wall. When the forces acting on the front face of the crown wall are analysed, it is found that the irregular placement of the antifer units reduces the wave forces by 30% compared to the closed pyramid placement of the antifer units and by 15% compared to the double pyramid placement of the antifer units. As a result, the relevant empirical coefficients in the formulae commonly used for the design of the crown wall were updated based on the measurements performed in the existing physical model experiments and reconciled with the experimental measurements.

Subject Keywords

Rubble mound breakwater, Crown wall, Antifer placement methods, Pressure, Wave Loads

URI

https://hdl.handle.net/11511/105226

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Graduate School of Natural and Applied Sciences, Thesis