• 한국해양공학회지
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• 제22권3호
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• pp.103-108
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• 2008

Topics discussed in this paper are engineering design of artificial reefs, design considerations of compressive strength and pH, materials of silica fume concrete and volcanic stones for reef construction, and field monitoring of artificial reefs. Six artificial reefs were deployed offshore at Biyangdo in July 2006, and succession patterns on the reefs were investigated bimonthly from July 2006 to October 2007. The spore-bag method, which has been widely used in Korea for the attachment of seaweed on artificial reefs, was applied to the developed reefs using the kelp Ecklonia cava, which is the dominant species in Jeju, and recruitment and growth patterns were observed.

• 수산해양교육연구
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• 제28권3호
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• pp.630-644
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• 2016

We conducted a comprehensive review on artificial reefs (ARs) including seaweed reefs for marine afforestation in relation to their development and research from 1972 to 2016, and then systematically analyzed their current a state-of-the-art and practice. From the review, the followings conclusions are made. First, the objectives of AR projects in the Southeast Asia can be classified into three, i.e. protection and increase of fishery resources, local community's profits, and ecological tourism. Second, fish gathering effects by ARs can be determined in terms of wake region or wake length that tends to increase with the K-C (Keulegan-Carpenter) number. Third, ARs are desirable to deploy across a direction of the main flow but it is essential to keep the deployment interval two to four times the length of a single reef. Fourth, stability of ARs depends on how to evaluate drag coefficient, and Morison formula turns out to be practical. Fifth, local scours of ARs are likely to occur due to a downward flow around the center of the front surface. Finally, it is natural for ARs to positively contribute to the marine ecosystem but it is imperative to develop an evaluation method for the effects of ARs on the marine ecosystem.

• Journal of Advanced Research in Ocean Engineering
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• 제2권4호
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• pp.169-178
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• 2016

Recently, artificial reefs (ARs) have been frequently used primarily owing to the development in AR materials and projects for relatively complicated, large ARs. Among several engineering issues of ARs, wake region of an AR has been characterized because these regions have a high probability of recruiting seaweed spores, providing an energy saving zone, and facilitating deposition of sediments, nutrients, and bio-deposits. To characterize an efficiency index of an AR wake region and its dependency on the prevailing water flow directions, this study proposes a so-called efficiency index diagram. This characterization is done by normalizing the wake volumes with respect to the real AR volume and illustrating how efficiency indices vary with respect to the inlet flow directions. As a result, according to the diagram characteristics such as an averaged efficiency index, fundamental symmetric angle, secure angles, and principal directions, we can easily figure out how a target AR should be aligned along the main water flows to maximize the wake region around the AR. In addition, six ARs are considered and their efficiency index diagrams are illustrated to pinpoint the physical characteristics.

• 한국해양생명과학회지
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• 제4권2호
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• pp.81-85
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• 2019

이 연구는 2016년 9월에 강원도 양양군 남애리, 경상북도 포항시 구룡포읍 석병2리에 설치한 인공어초를 대상으로 해조류 군집 변화를 관찰하기 위하여 연구를 수행하였다. 현장조사는 2017년 2월, 5월, 8월, 11월에 계절별 1회씩 SCUBA Diving으로 수행하였으며, 정량조사와 정성조사를 병행하였다. 본 연구에서 녹조류 11종, 갈조류 15종, 홍조류 68종을 포함하여 총 94종이 채집되었으며, 양양에서 66종(녹조류 8종, 갈조류 9종, 홍조류 49종), 포항에서 65종(녹조류 7종, 갈조류 9종, 홍조류 49종)이 채집 및 동정되었다. 중요도를 기반으로 판단한 우점종의 경우, 양양은 다시마(Saccharina japonica)가 우점종, 구멍갈파래(Ulva australis)가 준우점종이었으며 포항은 불레기말(Colpomenia sinuosa), 우뭇가사리(Gelidium elegans) 순으로 우점하였다. 두 해역 모두 어초 설치 초기에 각각 파래류, 불레기말이 착생한 후, 다시마, 감태, 우뭇가사리 등 다년생 해조가 생육하며 우점하여 기존의 천이 패턴과 유사하였다. 해조상 변화를 통해 군집관계를 명확히 하기 위해서는 추후 지속적인 모니터링을 통해 장기적인 변화를 관찰하여 해조군락이 안정되기까지의 천이 과정에 관한 모니터링이 필요한 것으로 판단된다.