Wave Control by Two-Rowed Fixed Floating Breakwaters near the Water Surface

J. Ocean Eng. Technol. 2001;15(4):1-7.

수면부근에 설치된 이열고정부방파제에 의한 파랑제어의 해석

김도삼,이재석,이봉재

한국해양대학교 토목환경공학부,한국해양대학교 대학원,한국해양대학교 대학원

Keywords: Fixed floating breakwater, Two-rowed, Green function, Boundary element method, Eingenfunction expansion method, Wave control

핵심용어: 고정부방파제, 이열, 그린 함수, 경계요소법, 고유함수전개법, 파랑제어

Abstract

Mainly, Floating Breakwaters (FBs) have been constructed in many coastal regions due to the advantages of the coastal environment and construction cost. In general, the FB becomes fixed or its width broadened because the movement of the FB comes to be large and its the wave control function lower for the long period incident waves. This study discusses the wave control function of two-rowed Fixed Floating Breakwater (FFBs) that have narrower width than that of the one-rowed FFB by using numerical approach. Boundary Element Method (BEM) based on the Green formula and Eigenfunction Expansion Method (EEM) are applied to evaluate the three-dimensional wave transformation near the wave fields of two-rowed FFBs. The validity of the present study is confirmed by comparing it with the results of Ijima et al. (1974) and Yoshida et al. (1992) for the one-rowed Fixed Floating Structure. It is revealed that the wave control function of two-rowed FFBs is more effective than that of the one-rowed FFB.