Costal regions in Korea often suffer severe damages due to wave-induced disasters, storm surge disasters and so on. therefore, many engineers and researchers have devoted their energy to prevent these costal disasters. The development of artificial reefs including sunken vessels is one of their remarkable achievements and various kind of these artificial upwelling structures have been designed and applied. However, the flow characteristics around a Tetrapod under the water has not been investigated experimentally. So in this article, in uniform flow of circulating water channel and some different velocities, PIV measurement has been conducted on the flow characteristics behind a Tetrapod. The results were analyzed on the flow characteristics of both cases of a Tetrapod. Therefore, it can be concluded that the both cases have its own distinctive flow characteristics behind the bluff body; Case A has an steep upstream flow pattern. On the contrary, Case B has an developed downstream flow pattern in the near wake of the Tetrapod. The velocity gradient at position x=150mm of Case-A appears gently up and down But, the velocity gradient at the same position of Case-B appears better highly up and down.

테트라포드(Tetrapod)는 입사파의 에너지를 소멸시키는 역할을 수행하는 콘크리트 불록으로 해안 구조물에 폭넓게 사용된다.본 연구에서는 건설 현장에서 테트라포드 제작하여 효율성을 높이는 기술을 제안하였다. 스틸로 만들어진 4개의 거푸집을 등분배하여, 여러 번 걸쳐 설치되고 해체 되어져야 한다. 비록 제안된 기술은 현존하는 기술과 유사한 4개의 파트로 구성된 거푸집을 사용하더라도 기존의 제작 방법과 다른 3개의 작은 분절이 모여 1개의 큰 상부 거푸집이 되며 바닥이 큰 거푸집이 이용된다. 새롭게 제안된 기술은 기존 기술과 비교하여 더 작은 노력과 시간을 들여 테트라포드를 생산할 수 있다.