A Study on the Long-Wave Effective Floating Breakwater I: On Trapezoid and Prominence Cross Section

J. Ocean Eng. Technol. 2001;15(1):7-11.

장주기파에 효율적인 부유식방파제에 대한 연구 I: 사다리꼴과 요철 단면형상에 대하여

김도영,안용호

홍익대학교 조선해양공학과,홍익대학교 조선해양공학과

Keywords: Floating breakwater(FBW), Wave transmission coefficient, Floating breakwater cross section, Trapezoid cross section, Prominence section

핵심용어: 부유식 방파제, 투과계수, 부유식 방파제 단면, 사다리 꼴 단면, 요철단면

Abstract

In this paper, trapezoid sections and prominence sections were examined to improve the performance of floating breakwater in long waves. The linear potential theory is used and the boundary element method with a matching boundary is employed for numerical computation. The effects of the side slope of the trapezoid section and the geometry ratio of the prominence section on the floating breakwater were examined. It was found that trapezoid sections show lower transmission coefficients than the rectangular sections in the long wave range. In prominence sections the size of the sides are more important than the size of the top. Proper choices of the pontoon type geometry may move the local minimum point of the wave transmission coefficient toward the longer wave ranges and improve the performance of the floating breakwater in the long wave range for a given wave period.