한국해안·해양공학회논문집 (Journal of Korean Society of Coastal and Ocean Engineers)

  • 제29권5호
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  • Pages.247-259
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  • 2017
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  • 1976-8192(pISSN)
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  • 2288-2227(eISSN)
한국해안·해양공학회 (Korean Society of Coastal and Ocean Engineers)
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시화호 조력발전소 운영에 의한 시화호 외측 해역에서의 체류시간 변화

Residence Time Variation by Operation of Sihwa Tidal Power Plant in Outer Sea of Sihwa Lake

  • 배윤호 (한국산업인력공단 기술자격출제실) ;
  • 윤병일 (인하대학교 해양과학과) ;
  • 서창훈 ((주)도화엔지니어링) ;
  • 박성진 ((주)지오시스템리서치) ;
  • 방기영 ((주)지오시스템리서치) ;
  • 권효근 (한국수자원공사 시화조력관리단) ;
  • 우승범 (인하대학교 해양과학과)
  • 투고 : 2017.09.29
  • 심사 : 2017.10.25
  • 발행 : 2017.10.31
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초록

입자추적기법(Lagrangian Particle Tracking; LPT)을 적용한 수치모델을 이용하여 조력발전소 운영에 의한 시화호 외측해역에서의 체류시간 변화를 파악하였다. 수치모델의 실험안은 공간적인 분포 특징을 살펴보기 위하여 시화호 외측 해역을 4개 구역으로 나누어 구역별 평균체류시간을 산정하였다. 구역별 평균체류시간은 운영 전과 운영 중 모두 가장 외해에 위치한 지역(약 3일)에서 내만에 위치한 지역(약 13일)으로 진입할수록 증가하는 특징이 나타났다. 구역별 평균체류시간 변화를 운영 전과 운영 중으로 비교하면 운영 전에 비해 운영 중에 가장 외해에 위치한 지역에서는 증가하고 나머지 구역에서는 감소하였다. 조력발전소 운영에 의한 인위적인 배수는 가장 외해에 위치한 지역에서 와동(vortex) 형성으로 입자 정체를 유발하였고, 나머지 지역에서는 연행작용(entrainment)을 발생시켜 체류시간의 변화에 영향을 주었다. 즉, 배수 시 발생하는 제트류(jet flow)와 와동, 연행작용으로 인한 체류시간 변화는 외해와 내만의 수평적 혼합 증가를 보여준다.

Numerical model with LPT (Lagrangian Particle Tracking) module was used to understand the variation of residence time in the outer sea of the Sihwa lake result operating from the Sihwa tidal power plant. Numerical model was composed in order to investigate the spatial distribution characteristics, the average residence time in each area was calculated by dividing the outer sea area of Sihwa lake into 4 areas. The average residence time of the areas appeared to be increase as it entered the areas located in the inner bay (13 days) from the area located in most outer sea (3 days) both before and during operation. Variation of average residence time by areas were increased in the area that was located in the most outer sea of during operation compared to before operation, and decreased in the other area. Artificial discharges from tidal power plant induces particle traps in the formation of vortex in the area located in the most outer seas, entrainment in the remaining areas, which affects variation in residence time. In other words, the jet flow generated during drainage and the change in the residence time due to the vortex and entrainment action indicate the increase horizontal mixing of water in the outer sea and in the inner bay.

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