Wave force Acting on the Artificial Rock installed on a Submerged Breakwater in a Regular Wave field

J. Ocean Eng. Technol. 2002;16(6):7-17.

잠제상에 설치된 표식암(의암)에 작용하는 규칙파파력의 실험적 연구

배기성,허동수

경상대학교 토목환경공학부(해양산업연구소),나고야대학대학원 공학연구과

Keywords: Artificial Rock, Impulsive Breaking Wave Force, Submerged Breakwater, Wave Breaking, Drag Coefficient, Inertia Coefficient

핵심용어: 의암, 충격쇄파력, 잠제, 쇄파, 항력계수, 관성력계수

Abstract

Recently, artificial rocks, instead of buoys, have been placed on the submerged breakwater to indicate its location. The accurate estimation of wave forces on these rocks is deemed necessary for their stability design. Characteristics of the wave force, however, are expected . to be very complicated because of the occurrence of breaking or post-breaking waves. In this regard, wave forces exerted on an artificial rock have been investigated in this paper. The maximum wave force has been found to strongly dependent on the location and shape of the artificial rock that is placed on the submerged breakwater. The plunging breaker occurs near the loading cram edge of a submerged breakwater, which cause impulsive breaking wave force on the rock. Using the Morison equation, with the velocity and acceleration at the front face of the artificial rock and varying water surface level, it is possible to estimate wave forces, even impulsive breaking wave forces, that are acting on the rock installed on a submerged breakwater. The vertical wave force is also found to depend, significantly, on the buoyant force.