Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Application Testing and Comparative Effectiveness of Green-tide Mitigation Technique in the Lower Part (Chusori) of the So-ok Stream (Daecheong Reservoir), Korea

소옥천 하류(추소리)에서 녹조현상 경감기술의 현장 시험 적용 및 효과 비교

  • Shin, Jae-Ki (Office for Southern Region Management of the Nakdong River, Korea Water Resources Corporation (K-water)) ;
  • Kim, Youngsung (K-water Research Institute, Korea Water Resources Corporation (K-water)) ;
  • Noh, Joonwoo (K-water Research Institute, Korea Water Resources Corporation (K-water)) ;
  • Kim, Jong-Myung (JM Environment and Bioscience Co. Ltd.) ;
  • Hwang, Soon-Jin (Department of Environmental Health Science, Konkuk University)
  • 신재기 (한국수자원공사 낙동강남부권관리단) ;
  • 김영성 (한국수자원공사 K-water연구원) ;
  • 노준우 (한국수자원공사 K-water연구원) ;
  • 김종명 ((주)제이엠이엔비) ;
  • 황순진 (건국대학교 보건환경과학과)
  • Received : 2016.06.21
  • Accepted : 2016.10.25
  • Published : 2016.12.31
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Abstract

This study was conducted to test the green-tide mitigation technique in the lower part of the Sook Stream (Chusori) of Daecheong Reservoir from June 27 to August 24, 2014. And the effects were compared with weekly monitoring result of the watching station of the algae alert system (AAS) as well as test beds reach. The green-tide in a test bed was begun from the upstream, and it was gradually transferred and spread toward the downstream by the hydrological factors. The total amount of algae removed by algae removal device during the test period was 33,920 kg, and solids dewatered by natural gravity was 8,480 kg. Also chlorophyll-a content was 2.83 kg, the number of blue-green algae cells was equivalent to $78.6{\times}10^{14}$ cells. Compared with the results of the watching station of AAS, the pre-concentrate removal work in the outbreak waters was able to suggest the possibility of green-tide mitigation. In addition, an effective management of the green-tide was required spatial and temporal occurrence information and practical device technology. Particularly, the optimal timing of algae removal in the river-reservoir hybrid system was recommended at times before the monsoon rainy season and reached the lowest water level.

본 연구는 2014년 6월 27일부터 8월 24일까지 대청호의 소옥천(추소리) 하류에서 녹조현상 경감기술을 시험하기 위하여 중점 수행되었다. 그리고 그 효과는 테스트베드 구간뿐만 아니라 조류경보제 관찰 지점의 주간 모니터링 결과와 비교 분석하였다. 테스트베드에서 녹조현상은 상류에서부터 시작하였고, 시간이 경과하면서 수문학적 요인에 의해 하류로 이송 및 확산되었다. 녹조 제거 장치의 시험적용 동안, 조류를 제거한 총량은 33,920 kg이었고, 이것을 자연중력에 의해 탈수시킨 고형물은 8,480 kg이었다. 또한, chlorophyll-a 함량은 2.83 kg이었고, 남조류의 세포수로 환산하면 $78.6{\times}10^{14}$ cells에 해당하였다. 조류경보제 관찰지점의 결과와 비교할 때, 대발생 수역에서 사전 집중제거는 녹조현상 완화의 가능성을 제시할 수 있었다. 녹조현상을 효과적으로 관리하기 위해서는 시공간적 발생 정보와 실용적 장치기술의 확보가 가장 우선되어야 하겠다. 특히 하천 - 저수지 hybrid 구간에서 녹조 제거의 최적 시기는 장마 이전과 최저 수위에 도달하였을 때로 볼 수 있었다.

Keywords

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