• Title/Summary/Keyword: 인공용승

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인공용승구조물의 수리학적 특성에 관한 기초적 연구

  • 김홍진;류청로
    • Proceedings of the Korean Society of Fisheries Technology Conference
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    • 2002.10a
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    • pp.170-172
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    • 2002
  • 해양의 수산자원개발을 위한 새로운 기술의 하나로 용승어장효과를 인공적으로 재현하여 어업생산성을 도모하기 위해 설치되는 인공용승구조물의 수리학적 특성을 검토하고 용승유량에 관한 기본적인 특성에 대해 연구하였다. 대상 인공용승구조물의 구조형식은 블록을 이용한 잠제 형식이며, 블록의 모양은 정육면체이다. 본 연구를 통해서 용승구조물의 용승유량 특성을 검토하고자 한다. (중략)

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Investigation of Efficiency of Artificial Upwelling Device in East Sea (인공용승장치의 동해안에서의 효율성 조사)

  • 홍남식;강석욱;김정윤
    • Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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    • 2002.08a
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    • pp.270-273
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    • 2002
  • 천연적인 용승현상이 발생하는 지역은 청결하고 풍부한 염양염류와 낮은 수온을 가진 심층수에 의해 좋은 어장을 형성한다. 그러므로, 전체 해양면적의 0.1%에 해당하는 천연용승 발생 지역에서 어획량은 전체의 거의 절반을 차지한다. 이러한 심충수를 인공적으로 끌어올리기 위해 파랑에너지를 이용하는 인공용승장치 에 관한 연구가 최근에 시도되고 있다. (중략)

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Flow Characteristics of the Artificial Upwelling Structure by Porosity Change (공극률 변화에 따른 인공용승류 특성)

  • Lee, Hwang Ki;Kim, Young Min;Kim, Jong Kyu
    • Journal of the Korean Society for Marine Environment & Energy
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    • v.20 no.2
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    • pp.100-106
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    • 2017
  • 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.

Characteristics of Oceanographic Environment in a Building with a Sea Area for the Artificial Upwelling Structure. (인공용승구조물 설치해역의 해양환경 특성)

  • Kim Dong-Sun;Hwang Suk-Bum
    • Proceedings of KOSOMES biannual meeting
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    • 2005.11a
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    • pp.133-137
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    • 2005
  • To investigated the variation of marine environments due to set up of artificial structure, we carried out field observations. High temperature and salinity waters were distributed clearly in the southeastern part of study area during summer season. The variation of current structure was also occurred around study area where artificial structure set up. In 2005 after set up of artificial structure, the nutrient concentration increased greater than that in 2002 before set up artificial structures. To illustrate the characteristics of marine environment due to set up of artificial structure, quantitative analyses on the effect of artificial structure are important.

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The Variation of Current by the Building of Artificial Upwelling Structure (인공용승구조물 설치에 의한 유동변화)

  • Kim, Dong-Sun;Hwang, Suk-Bum;Kim, Dae-Hyun
    • Proceedings of KOSOMES biannual meeting
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    • 2006.11a
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    • pp.155-158
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    • 2006
  • 한국 남해안 거제도 앞바다에 투하된 인공용승구조물에 대한 유통 변화를 파악하기 위해 ADCP(Acoustic Doppler Current Profiler)를 선박에 장착하여 정선관측을 실시하였다. 관측결과 구조물 투하전과 후의 유통비교를 보면 구조물 주변역에서 표층에서부터 수심 $30\sim40m$까지의 충과 그 이심까지의 흐름이 다르게 나타났다. 또한 구조물 주변역에서 연직유동성분의 흐름이 구조물 투하 전에는 하강류의 분포가 많이 나타났으나 구조물 투하 후에는 상승류의 성분이 많이 나타남을 알 수 있었다.

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Characteristics of Oceanographic Environment in a Sea Area for the Building of Artificial Upwelling Structure (인공용승구조물 설치해역의 해양환경 특성)

  • Kim Dong-Sun;Hwang Suk-Bum
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.12 no.1 s.24
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    • pp.1-8
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    • 2006
  • To investigate the variation of marine environments due to set up of artificial structure, we carried out field observations. High temperature and salinity waters near the south frontal area were distributed clearly in the southeastern part of study area during summer season The variation of current structure was also occurred around study area where artificial structure set up. In 2005 after set up of artificial structure, the nutrient concentration increased greater than that in 2002 before set up artificial structures. To illustrate the characteristics of marine environment due to set up of artificial structure, quantitative analyses on the effect of artificial structure are important.

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A study on hydrodynamic characteristics of artificial upwelling structures (인공용승구조물의 수리학적 기능성에 관한 연구)

  • Kim, Hong-Jin;Jeon, Yong-Ho;Ryu, Cheong-Ro
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2002.05a
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    • pp.62-67
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    • 2002
  • While upwelling regions account for only 0.1% of the ocean surface, they yield over 40% of world's fish catch. Thus it is vary important making upwelling region by various methods. This study was performed to find out basic hydrodynamic characteristics (function, stability..,) of artificial upwelling structures. The hydrodynamic characteristics of artificial upwelling structures can be summarized as follows: 1) The falling velocity of blocks was effected size($l_B$) of blocks than incident current velocity( $V_0$). 2) The falling horizontal distance was reduced as induce of stratification parameters and block' size. 3) Generation of artificial upwelling current was effected by size of structures and incident current. When stratification parameters was about 3.0 and relative height(hs/h) of structures was about $0.125{\sim}0.15$, stable artificial upwelling current was generated in the back-side of structures.

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A Study on Function of Artificial Upwelling Structure of Material (재질에 따른 인공용승구조물의 기능성에 관한 연구)

  • Jeon, Yong-Ho;Kim, Hong-Jin;Ryu, Cheong-Ro
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2002.10a
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    • pp.277-282
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    • 2002
  • This study was performed to find out basic function of artificial upwelling structures. Generation of artificial upwelling current was affected by size of structures, incident current and porosity. when stratification parameters was about 3.0, relative height(hs/h) of structures was $0.125{\sim}0.15$, stable artificial upwelling current was generated in the back-side of structures. when porosity is lower than 50%, the effect of artificial upwelling structure was to be better than little by little.

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Variation of Physical Environment near the Artificial Upwelling Structure during the Summer (하계 인공용승구조물 주변해역의 물리환경변화)

  • Seo, Ho-San;Kim, Dong-Sun
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.21 no.4
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    • pp.372-380
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    • 2015
  • In order to study the characteristics of physical environment in water column around the artificial upwelling structure, CTD and currents measurements were carried out along line observations. Before installation of artificial upwelling structure was installed, the stratification of water column existed 30m in water depth. After installation of artificial upwelling structure, however, stratification formation depth and strength changed depending on currents directions. It seems that the change of stratification has a close relation with upwelling of lower temperature water. After installing the artificial upwelling structure, the distributions of vertical flows were analyzed. Local upwelling and downwelling flows showed a distinct time and spacial changes. Local upwelling flows caused by artificial upwelling structure appeared 100 times larger than coastal upwelling in the South-East Sea of Korea. Upwelling flows generated by the artificial structure raised the high concentration of nutrients to upper layer from lower layer breaking stratification in the summer. Thus, upwelling structure plays an important role for vertical water circulation improving the food environments by increasing primary production.