Journal of the Korean Society for Marine Environment & Energy (한국해양환경ㆍ에너지학회지)

The Korean Society for Marine Environment and Energy (한국해양환경•에너지학회)
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Flow Characteristics of the Artificial Upwelling Structure by Porosity Change

공극률 변화에 따른 인공용승류 특성

  • Lee, Hwang Ki (Department of Naval Architecture & Ocean Engineering, Chonnam National University) ;
  • Kim, Young Min (Department of Naval Architecture & Ocean Engineering, Chonnam National University) ;
  • Kim, Jong Kyu (Department of Naval Architecture & Ocean Engineering, Chonnam National University)
  • 이황기 (전남대학교 조선해양공학과) ;
  • 김영민 (전남대학교 조선해양공학과) ;
  • 김종규 (전남대학교 조선해양공학과)
  • Received : 2017.04.27
  • Accepted : 2017.05.19
  • Published : 2017.05.25
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Abstract

Artificial upwelling structure has been set up in sea mount. Bottom water can upwelling euphotic zone. Plentiful nutrient included in bottom water could not only enhance primary production but also expect food chain reaction and gathering fish. This study explain flowing features subject to porosity changes according to the material and shape of artificial upwelling structure. As a result, the upward flux is getting decreased while the porosity is increasing. And it figured out when the upward flux was decreased, the downward flux was also decreased. Futhermore, it was confirmed that the best efficiency of upwelling flux was shown up when the porosity was 10% according to the volume of artificial upwelling structure in case of 20% of porosity, it also has a good efficiency in comparison with impermeable artificial upwelling structure. Therefore, to build the artificial upwelling structure, It is encouraged to design it less than 20% of porosity for the best performance.

인공용승구조물은 저층에 인공적으로 해중산(Sea Mount)을 설치하여, 저층수가 상층의 유광층(Euphotic Zone)으로 용승되도록 하는 구조물로 저층수에 포함된 풍부한 영양염의 공급은 일차생산을 증가시키고 이에 따른 먹이 연쇄작용 및 어류 군집 유도효과를 기대할 수 있다. 본 연구에서는 인공용승구조물의 재료 및 형태에 따라 달라질 수 있는 공극률의 변화에 따른 흐름특성을 파악하고자 하였다. 그 결과, 공극률이 커질수록 상승유량은 작아졌고, 상승유량이 작아짐에 따라 하강유량도 작아지는 특성을 파악할 수 있었다. 인공용승구조물의 단위면적당 용승유량은 공극률이 10%일 때 가장 좋은 효율을 나타냈으며, 공극률이 20%일 경우에도 불투과성 인공용승구조물에 비해 좋은 효율을 보였다. 따라서 인공용승구조물의 최적단면을 설계할 경우 공극률을 20% 이하로 설계할 때 좋은 효율을 보일 것으로 판단된다.

Keywords

References

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