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Journal of Korean Society of Coastal and Ocean Engineers > Volume 32(6); 2020 > Article
J Korean Soc Coast Ocean Eng 2020;32(6): 434-445. doi: https://doi.org/10.9765/KSCOE.2020.32.6.434
투과제를 이용한 중력외파의 항내 수면진동 저감 방법에 대한 연구
곽문수1, 정원무2
1명지전문대학교 토목공학과 교수
2한국해양과학기술원 해양ICT융합연구센터 책임연구원
A Study on Minimization of Harbor Oscillations by Infragravity Waves Using Permeable Breakwater
Moon Su Kwak1, Weon Mu Jeong2
1Professor, Department of Civil Engineering, Myongji College, 134, Gajwa-ro, Seodaemun-gu, Seoul 03656, Korea
2Principal Research Scientist, Maritime ICT R&D Center, Korea Institute of Ocean Science Technology
Corresponding author: Moon Su Kwak ,Tel: +82-2-300-1290, Email: moonsu@mjc.ac.kr
Received: November 18, 2020;  Accepted: December 7, 2020.
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ABSTRACT
In this study, the minimization of harbor oscillation using permeable breakwater was applied to the actual harbor and investigated an effect of minimization by computer simulation in order to take into account the water quality problems and measures of harbor oscillation by infragravity waves at the same time. The study site is Mukho harbor located at East coast of Korea that harbor oscillation has been occurred frequently. The infragravity waves obtained by analyzing the observed field data for five years focused on the distribution between wave periods of 40 s and 70 s and wave heights in less than 0.1 m was 94% of analyzing data. The target wave periods was 68.0 s. The most effective method of minimization of harbor oscillation by infragravity waves was to install a detached permeable breakwater with transmission coefficient of 0.3 on the outside harbor and replace some area of the vertical wall in the harbor with wave energy dissipating structure to achieve a reflectivity of 0.9 or less. The amplitude reduction rate of this method shown in 27.4%. And the effect of the difference in transmission coefficient of permeable breakwater on the reduction rate of the amplitude was not significant.
Keywords: infragravity waves, harbor oscillation, minimization method, permeable breakwater, long-term field data, Boussinesq wave model
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