Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Analysis of Microcystis Bloom in Daecheong Reservoir using ELCOM-CAEDYM

ELCOM-CAEDYM을 이용한 대청호 Microcystis Bloom 해석

  • Chung, Se Woong (Department of Environmental Engineering, Chungbuk National University) ;
  • Lee, Heung Soo (Department of Environmental Engineering, Chungbuk National University)
  • 정세웅 (충북대학교 환경공학과) ;
  • 이흥수 (충북대학교 환경공학과)
  • Received : 2010.08.26
  • Accepted : 2010.12.28
  • Published : 2011.01.30
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Abstract

An abnormal mono-specific bloom of the cyanobacterium Microcystis aeruginosa had developed at a specific location (transitional zone, monitoring station of Hoenam) in Daecheong Reservoir from middle of July to early August, 2001. The maximum cell counts during the peak bloom reached 1,477,500 cells/mL, which was more than 6~10 times greater than those at other monitoring sites. The hypothesis of this study is that the timing and location of the algal bloom was highly correlated with the local environmental niche that was controled by physical processes such as hydrodynamic mixing and pollutant transport in the reservoir. A three-dimensional, coupled hydrodynamic and ecological model, ELCOM-CAEDYM, was applied to the period of development and subsequent decline of the bloom. The model was calibrated against observed water temperature profiles and water quality variables for different locations, and applied to reproduce the algal bloom event and justify the limiting factor that controled the Microcystis bloom at R3. The simulation results supported the hypothesis that the phosphorus loading induced from a contaminated tributary during several runoff events are closely related to the rapid growth of Microcystis during the period of bloom. Also the physical environments of the reservoir such as a strong thermal stratification and weak wind velocity conditions provided competitive advantage to Microcystis given its light adaptation capability. The results show how the ELCOM-CAEDYM captures the complex interactions between the hydrodynamic and biogeochemical processes, and the local environmental niche that is preferable for cyanobacterial species growth.

Keywords

Acknowledgement

Supported by : 충북대학교

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