Change in Wave Pressure at the Front and Rear Walls According to the Porosity of Perforated Caisson Breakwater

Title
Change in Wave Pressure at the Front and Rear Walls According to the Porosity of Perforated Caisson Breakwater
Author(s)
오상호; 지창환; 오영민; 장세철
KIOST Author(s)
Oh, Sang Ho(오상호)Oh, Young Min(오영민)Jang, Se Chul(장세철)
Publication Year
2013-09-18
Abstract
This paper presents experimental results on wave pressures acting on the front and rear walls of a perforated caisson breakwater. Measurement of wave pressures was made first for a non-porous caisson in order to compare and verify the experimental results with the well-known Goda’s pressure formula. Then, the experiment was carried out for a porous caisson having wave chamber slab, by varying the front wall porosity. In general, higher pressures were measured along the both vertical walls with respect to the front wall porosity. Magnitudes of wave force based on integration of the measured wave pressures also showed similar trend, especially for steeper waves. The integrated wave forces were significantly greater than that based on Takahashi’s pressure formula, probably due to geometrical feature of the caisson having the wave chamber slab, which made favourable condition of gentle air compression and subsequent burst phenomenon inside the chamber. Further experimental verification by direct measurement of wave force is required before using the above finding in the practical design of perforated caisson breakwaters.imental results with the well-known Goda’s pressure formula. Then, the experiment was carried out for a porous caisson having wave chamber slab, by varying the front wall porosity. In general, higher pressures were measured along the both vertical walls with respect to the front wall porosity. Magnitudes of wave force based on integration of the measured wave pressures also showed similar trend, especially for steeper waves. The integrated wave forces were significantly greater than that based on Takahashi’s pressure formula, probably due to geometrical feature of the caisson having the wave chamber slab, which made favourable condition of gentle air compression and subsequent burst phenomenon inside the chamber. Further experimental verification by direct measurement of wave force is required before using the above finding in the practical design of perforated caisson breakwaters.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/26784
Bibliographic Citation
ICE Breakwaters, pp.1 - 10, 2013
Publisher
Institution of Civil Engineers
Type
Conference
Language
English
Publisher
Institution of Civil Engineers
Related Researcher
Research Interests

Coastal engineering,연안공학

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