Journal of Advanced Research in Ocean Engineering

Korean Society of Ocean Engineers (한국해양공학회)
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Efficiency Index Diagram for Wake Region Evaluation of Artificial Reefs Facilitated for Marine Forest Creation

  • Kim, Dongha (Department of Ocean Engineering Pukyong National University) ;
  • Jung, Somi (Department of Ocean Engineering Pukyong National University) ;
  • Na, Won-Bae (Department of Ocean Engineering Pukyong National University)
  • Received : 2016.10.01
  • Accepted : 2016.12.05
  • Published : 2016.12.31
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Abstract

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.

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