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Original Article

Field Applications of Non-powered Downward Water Circulation System to Improve Reservoir Water Quality

저수지 수질개선을 위한 무동력 하향류 수류순환시스템의 현장적용성

YeoJu Jang1
,
HyunMan Lim2
,
JinHong Jung2
,
JaeRho Park3
,
WeonJae Kim4*
장 여주1
,
임 현만2
,
정 진홍2
,
박 재로3
,
김 원재4*
1Master’s course, University of Science and Technology (UST), Smart City & Construction Engineering
2Senior researcher, Korea Institute of Civil Engineering and Building Technology (KICT), Department of Land, Water and Environment Research
3Senior research fellow, Korea Institute of Civil Engineering and Building Technology (KICT), Department of Land, Water and Environment Research
4Research fellow, Korea Institute of Civil Engineering and Building Technology (KICT), Department of Land, Water and Environment Research
1과학기술연합대학원대학교 스마트도시･건설융합 석사과정
2한국건설기술연구원 국토보전연구본부 수석연구원
3한국건설기술연구원 국토보전연구본부 선임연구위원
4한국건설기술연구원 국토보전연구본부 연구위원
* Corresponding Author
30 June 2019. pp. 109-119
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Abstract

Eutrophication has occurred due to the inflow of various water pollutants in many Korean reservoirs with low depth, and algal blooms of surface layer and low oxygenation of deep layer have repeated every year. There are several existing technologies to alleviate the stratification of reservoirs, but it is difficult to apply them in field sites due to the necessity of electric power and low economic efficiency. In this study, a non-powered water circulation system using natural energy of wind and water flow has been developed, and two test-beds constructed in the reservoirs with different conditions and examined its field applicability. Through computational fluid dynamics (CFD) simulation, it has been shown that the water circulation system could induce the downward flow to mitigate the stratification between surface and deep layers, and its influence radius could reach about 30 m. As a result of long-term monitoring of the test-beds, various water quality improvement effects have been observed such as moderation of DO fluctuation by water circulation, reduction of DO supersaturation and prevention of excessive pH rising. In order to improve the applicability of the water circulation system, it is considered necessary to review countermeasures against flood and depth conditions of each reservoir.

Keywords
Eutrophication
Low reservoir
Stratification
Water Circulation
Water Quality Improvement

국내의 많은 저수심 저수지들은 다양한 수질오염물질의 유입으로 인해 부영양화가 진행되고 있으며, 해마다 반복적으로 표층의 녹조 발생과 저층의 빈산소화를 겪고 있다. 이를 방지하기 위한 대책으로 저수지의 성층현상을 완화하는 기존 기술들이 있으나 대부분 동력이 필요하며 비경제적인 측면으로 인해 도입이 어려운 실정이다. 본 연구에서는 바람과 수류의 자연에너지를 활용하는 무동력 수류순환시스템을 개발하고 상이한 조건을 갖는 두 저수지를 대상으로 테스트베드를 구축, 운영하여 현장적용성을 검토하였다. 수류순환시스템을 모사한 전산유체역학 (CFD) 모의 결과, 하향류가 유도되어 표층과 심층 사이의 성층현상을 완화시키고, 영향반경은 약 30 m에 달하는 것으로 해석되었다. 테스트베드에 대한 장기 모니터링 결과, 수류순환 작용에 의해 DO의 변동을 완만하게 하고, DO 과포화 현상을 저감하며, pH의 과도한 상승을 방지하는 등 다양한 수질개선 효과가 관찰되었다. 본 수류순환시스템의 현장적용성을 제고하기 위해서는 홍수시 및 저수심 조건에 대한 대응방안 마련이 필요한 것으로 판단된다.

키워드
부영양화
저수심 저수지
성층현상
수류순환
수질개선
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Information
  • Publisher :Korean Society of Ecology and Infrastructure Engineering
  • Publisher(Ko) :응용생태공학회
  • Journal Title :Ecology and Resilient Infrastructure
  • Journal Title(Ko) :응용생태공학회 논문집
  • Volume : 6
  • No :2
  • Pages :109-119
  • Received Date : 2019-06-15
  • Revised Date : 2019-06-25
  • Accepted Date : 2019-06-25
  • DOI :https://doi.org/10.17820/eri.2019.6.2.109
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