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고광오,백승우,박창범,이종인,Ko, Kwangoh,Pack, Seungwoo,Park, Changbeom,Lee, Jong-In 대한토목학회 2015 대한토목학회논문집 Vol.35 No.1
본 연구에서는 파일지지식 소파방파제의 파압특성을 2차원 수리모형실험을 통해 분석하였다. 단일 유공벽 및 이중 유공벽을 가진 모형체를 통해 실험을 수행하였으며, 측정된 파압결과는 Goda 파압과 비교분석하였다. 단일 유수실의 경우, 측정된 최대파압이 Goda 파압과 비교하여 전면벽의 경우 25%, 후면벽의 경우 30%가 감소하였다. 이중 유수실의 경우에는 최대파압이 Goda 파압대비 전면벽 27%, 중간벽 53%, 후면벽 64% 감소한 것을 알 수 있다. 이로부터 이중 유공벽을 가진 소파방파제가 단일 유공벽의 경우와 비교하여 파압이 현저히 감소하는 것을 알 수 있었으며, 이는 유공 1실과 2실의 횡슬릿의 유공벽을 통과하면서 발생하는 파랑에너지의 소산으로 인해 후면벽에 작용하는 파압의 크기가 작아졌기 때문으로 판단된다. This study investigates the wave pressure characteristics of the pile-supported breakwater with single or double perforated walls through 2-D hydraulic experiments and the measured wave pressures are compared to those of wave pressures by Goda's formula. For single chamber, the measured wave pressures in the front wall and rear wall decreased to about 25% and 30%, respectively, compared to those of wave pressures by Goda's formula. Also, the decrease in the wave pressures for double chamber were about 27%, 53%, and 64% in the front wall, middle wall, and rear wall, respectively. It was found that the pile-supported breakwater with double perforated walls was more efficient than the single chamber due to wave dissipation effects of double slit walls with horizontal slits.
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.
Tidal Bladed를 이용한 조류발전 지지구조물 설계
고광오(Kwang-Oh Ko),이강희(Kang-Hee Lee),박창범(Chang-Beom Park),조철희(Chul-Hee Jo) 한국연안방재학회 2016 한국연안방재학회지 Vol.3 No.3
The importance of tidal energy has increased steadily throughout the world, and it is recognized as the most reliable energy resource from the ocean. It has great advantages compared to other renewable energy resources due to high energy density in sea water, reliability and predictability. There are many suitable sites for the application of tidal current power (TCP) in Korea because the strong current water area are located in the western and southern coasts with high tidal range up to 10m. Even though many tidal turbines are demonstrated to increase the power efficiency, the cost-saving technologies are still required for economical design of the device. Since the structure and installation cost is dominant in development expense of TCP system, economical supporting structure and installation procedure should be developed. Because the ground conditions of most installation site are rocky bed due to its rapid current, gravity structures are regarded as the most competitive solutions than any other piled structures. Gravity base caisson support structure can be installed with small equipment and the stability can be increased by the injection underwater concrete after the installation. To design the caisson structure which is suitable for the TCP system, integrated load analysis has been carried out using Tidal Bladed considering various design load cases. Multi-body dynamic method was used for interaction between components and dynamic loading on the TCP system was simulated. Calculated load was applied to the design of caisson structure and findings have been summarized in this paper.