In this paper Using a TTP to the experimental study on the stability of the Submerged breakwaters would like to perform. Experiment conditions consisted of structure conditions and incident wave conditions. Submerged breakwater which consisted of two layer installed in wave flume. height and crest width of submerged breakwaters are 8.6cm and 80cm, respectively. The three types of TTP were used: normal type, safety type, safety type(connect). In this study, rocking rate of submerged breakwater applied the general definition in Shore Protection Manual. Damage in terms of displaced blocks is generally given as the relative displacement, D, defined as the proportion of displaced blocks relative to the total number of blocks. Rocking rate was plotted in Figure 5 as function of Lb/L0. h=2.0hs, T=2sec case rocking rate of normal tetrapod are 57.1 %, safety tetrapod are nonrocking. Experimental result shown that stability of safety tetrapod higher than normal tetrapod.

ABSTRACT
1. 서 론
2. 수리모형실험
    2.1 실험장치
    2.2 실험조건
    2.3 실험방법
3. 블록의 안정성
    3.1 안정성
4.실험결과
5. 결 론
참 고 문 헌

• 김인철(부경대학교 해양공학과) | In-Cheol KIM (Dept. of Ocean Engineering, Pukyong National University, Busan, Korea)
• 최진휴(부경대학교 해양공학과) | Jin-Hyu CHOI (Dept. of Ocean Engineering, Pukyong National University, Busan, Korea)
• 류청로(부경대학교 해양공학과) | Cheong-Ro RYU (Dept. of Ocean Engineering, Pukyong National University, Busan, Korea)