Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Relationship among Inflow Volume, Water Quality and Algal Growth in the Daecheong Lake

대청호 유입유량 변동과 수질 및 조류증식의 관계

  • Cheon, Se-Uk (Geum River Environment Research Center, National institute of Environmental Research) ;
  • Lee, Jea-An (Geum River Environment Research Center, National institute of Environmental Research) ;
  • Lee, Jay J. (Geum River Environment Research Center, National institute of Environmental Research) ;
  • Yoo, Yung-Bok (Geum River Environment Research Center, National institute of Environmental Research) ;
  • Bang, Kyu-Chul (Geum River Environment Research Center, National institute of Environmental Research) ;
  • Lee, Yeoul-Jae (Geum River Environment Research Center, National institute of Environmental Research)
  • 천세억 (국립환경과학원 금강물환경연구소) ;
  • 이재안 (국립환경과학원 금강물환경연구소) ;
  • 이재정 (국립환경과학원 금강물환경연구소) ;
  • 유영복 (국립환경과학원 금강물환경연구소) ;
  • 방규철 (국립환경과학원 금강물환경연구소) ;
  • 이열재 (국립환경과학원 금강물환경연구소)
  • Received : 2005.12.07
  • Accepted : 2006.01.12
  • Published : 2006.03.30
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Abstract

Changes in water quality and algal growth according to the differences in the inflow volume were investigated in the Daecheong Lake from 1998 to 2001. Until year 2000, inflow volume considerably depended on the rainfall throughout the basin. However, the correlation was low since 2001 when water storage in the upstream Yongdam Lake was started. According to inflow volume-TP relationship analyses, significant correlation was found at up- and middle-stream sites, excluding down-stream site of the Daechong Lake. For chlorophyll-a, correlation was found with flow volume at all sites except for Choo-So. In a dry year, although nutrients loads were relatively lower than those in rainy years, there were higher concentrations of chlorophyll-a and massive bloom of Microcystis. Limiting factors for algal growth seems to be not the volume of nutrients load but retention time and physical disturbance of the water body influenced by inflow volume. Thus, in the Daecheong lake, it would be more important to focus on the management of eutrophication in dry years than in rainy ones.

Keywords

References

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