Nonlinear Dynamic Responses among Wave, Submerged Breakwater and Seabed

J. Ocean Eng. Technol. 2005;19(6):35-43.

HAN DONG SOO;KIM CHANG HOON;YEOM CYEONG SEON;KIM DO SAM;

Institute of Marine Industry, Division of Civil and Environmental Engineering, Gyeongsung National University;Division of Construction and Environmental Engineering, Graduate School, Korea Maritime University;Division of Civil and Environmental Engineerin

파$cdot$수중방파제$cdot$지반의 비선형 동적응답에 관한 연구

허동수;김창훈;염경선;김도삼;

경상대학교 토목환경공학부 해양산업연구소;한국해양대학교 대학원 건설환경공학부;경상대학교 대학원 토목환경공학부;한국해양대학교 건설환경공학부;

Keywords: Direct Numerical Simulation, Submerged Breakwater, Seabed, Pore Water Pressure, Flow

핵심용어: 직접수치해석, 수중방파제, 해저지반, 간극수압, 흐름

Abstract

Recently, various-shaped coastal structures have been studied and developed. Among them, the submerged breakwater became generally known as a more effective structure than other structures, bemuse it not only serves its original function, but also has the ability to preserve the coastal environment. Most previous investigations have been focused on the wave deformation and energy dissipation due to submerged breakwater, but less interest was given to their internal properties and dynamic behavior of the seabed foundation under wave loadings. In this study, a direct numerical simulation (DNS) is newly proposed to study the dynamic interaction between a permeable submerged breakwater aver a sand seabed and nonlinear waves, including wave breaking. The accuracy of the model is checked by comparing the numerical solution with the existing experimental data related to wave $cdot$ permeable submerged breakwater $cdot$ seabed interaction, and showed fairly nice agreement between them. From the numerical results, based on the newly proposed numerical model, the properties of the wave-induced pore water pressure and the flow in the seabed foundation are studied. In relation to their internal properties, the stability oj the permeable submerged breakwater is discussed.