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민은종(Eun-Jong Min),천세현(Se-Hyeon Cheon),서경덕(Kyung-Duck Suh) 한국해안해양공학회 2015 한국해안해양공학회 논문집 Vol.27 No.2
본 연구에서는 사석 방파제에 사용되는 대표적 방사형 소파 블록인 Tetrapod, Rakuna-IV 및 Dimple 등에 대하여 각각 두 가지의 정적 피복 방법을 제안하고 각 방법에 대한 안정계수를 수리실험을 통하여 결정하였다. Tetrapod와 Rakuna-IV는 피복 방법에 상관없이 비슷한 안정계수를 보인 반면, Dimple은 피복 방법에 따라 약간 다른 안정계수를 보였다. Dimple이 가장 큰 안정계수를 나타낸 반면, Tetrapod가 가장 작은 안정계수를 나타내었다. Tetrapod와 Rakuna-IV를 정적 하였을 경우에는 난적보다 약간 큰 안정계수를 보인 반면, Dimple을 정적 했을 경우에는 난적보다 훨씬 큰 안정계수를 나타내었다. 하지만, 본 연구에서 제안한 Dimple의 정적 방법은 공극률이 매우 작고 일층 피복 블록과 비슷한 거동을 보여서 급격한 파괴가 발생할 수 있으므로 주의를 요한다. In this study, two different uniform placement methods are proposed for each of Tetrapod, Rakuna-IV, and Dimple armoring a rubble mound breakwater, and the corresponding stability coefficients are determined by hydraulic experiments. The Tetrapod and Rakuna-IV show similar stability coefficients regardless of the placement methods, whereas the Dimple shows somewhat different stability coefficients depending on the placement methods. It is shown that the Dimple gives the largest stability coefficient, whereas the Tatrapod gives the smallest value. The uniform placement methods of Tatrapod and Rakuna-IV give slightly larger stability coefficients than the random placement, whereas the uniform placements of Dimple give much larger stability coefficients than the random placement. However, the small void ratio of uniform placements of Dimple requires attention because the blocks would behave like single layer system blocks so that brittle failure could occur.
고광오(Kwangoh Ko),천종우(Jongwoo Chun),백승우(Seungwoo Pack),민은종(Eunjong Min),박창범(Changbeom Park) 한국신재생에너지학회 2016 신재생에너지 Vol.12 No.3
Tidal current power has advantages over other renewable energy resources due to the high energy density of the fluid, steadiness and predictability. On the other hand, it has the disadvantage of the high initial construction costs when a generation system is installed and power transmission is expensive compared to the generating capacity. To overcome these disadvantages, it is important to develop a more economical and good workability supporting structure. A caisson-type supporting structure has the advantage that there is no need to mobilize a large floating crane because it uses buoyancy during transport and installation. In addition, it is cost-effective compared to the existing gravity type or jacket type supporting structures because of installation costs. In this study, a caisson-type supporting structure is proposed as a tidal current generation supporting system, and a numerical simulation was performed under the conditions of the nearby Uldolmok maritime area. The design wave height was derived by comparing the SWAN program and ACES program, and the review of the flood and ebb tide flow velocity was carried out using the EFDC program. In addition, integrated load analysis of the tidal current power generation system in each conditions was performed using the Tidal-Bladed program.