Characteristics of Wave on Circular Breakwater of Double Array by Various Porous Coefficients among Circular Caissons

Park, Min Su

doi:2020.32.6.420

Journal of Korean Society of Coastal and Ocean Engineers > Volume 32(6); 2020 > Article

Article

J Korean Soc Coast Ocean Eng 2020;32(6): 420-433. doi: https://doi.org/10.9765/KSCOE.2020.32.6.420

원형케이슨들간의 공극률 변화에 따른 2열 배치 원형방파제에 작용하는 파랑 특성 분석

박민수

한국건설기술연구원 인프라안전연구본부 수석연구원

Characteristics of Wave on Circular Breakwater of Double Array by Various Porous Coefficients among Circular Caissons

Min Su Park

Senior Researcher, Department of Infrastructure Safety Research, Korea Institute of Civil Engineering and Building Technology, 283 Goyangdae-ro, Ilsanseo-gu, Goyang-si, Gyeongggi-do 10223, Korea

Corresponding author: Min Su Park ,Tel: +82-31-910-0289, Fax: +82-31-910-0121, Email: mspark@kict.re.kr

Received: November 19, 2020; Revised: December 3, 2020. Accepted: December 4, 2020.

ABSTRACT

In order to increase the stability of existing breakwater, new caissons are installed on the back or the front of existing caissons. It is very important to evaluate wave force and wave run-up according to the change of porosity among caissons and the energy loss due to separation effects. In this study, we use the eigenfunction expansion method with Darcy’s law, which describes the flow of a fluid through a porous plate, to analyze the characteristics of wave on circular breakwater of double array for various porous coefficients. To verify the numerical method, the comparison between present results and Sankarbabu et al. (2008) is made. The wave force and the wave run-up acting on each dual cylindrical caisson are calculated for various parameters by considering the energy loss and the change of porosity.

Keywords: eigenfunction expansion method, porous coefficient, dual cylindrical caisson, wave force, wave run-up