Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Analysis of Spatial Water Quality Variation in Daechung Reservoir

대청호 수리-수질의 공간적 변동 특성 분석

  • Lee, Heung Soo (Department of Environmental Engineering, Chungbuk National University) ;
  • Chung, Se Woong (Department of Environmental Engineering, Chungbuk National University) ;
  • Choi, Jung Kyu (Department of Management of Social Systems and Civil Engineering, Tottori University) ;
  • Oh, Dong Geun (Department of Environmental Engineering, Chungbuk National University) ;
  • Heo, Tae Young (Department of Information and Statistics, Chungbuk National University)
  • 이흥수 (충북대학교 환경공학과) ;
  • 정세웅 (충북대학교 환경공학과) ;
  • 최정규 (돗토리대학 사회기반공학전공) ;
  • 오동근 (충북대학교 환경공학과) ;
  • 허태영 (충북대학교 정보통계학과)
  • Received : 2010.08.31
  • Accepted : 2011.09.08
  • Published : 2011.09.30
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Abstract

The uses of multi-dimensional hydrodynamic and water quality models are increasing to support a sustainable management of large dam reservoirs in Korea. Any modeling study requires selection of a proper spatial dimension of the model based on the characteristics of spatial variability of concerned simulation variables. For example, a laterally averaged two-dimensional (2D) model, which has been widely used in many large dam reservoirs in Korea, assumes that the lateral variations of hydrodynamic and water quality variables are negligible. However, there has been limited studies to give a justification of the assumption. The objectives of this study were to present the characteristics of spatial variations of water quality variables through intensive field monitoring in Daechung Reservoir, and provide information on a proper spatial dimension for different water quality parameters. The monitoring results showed that the lateral variations of water temperature are marginal, but those of DO, pH, and conductivity could be significant depending on the hydrological conditions and local algal biomass. In particular, the phytoplankton (Chl-a) and nutrient concentrations showed a significant lateral variation at R2 (Daejeongri) during low flow periods in 2008 possibly because of slow lateral mixing of tributary inflow from So-oak Stream and wind driven patchiness.

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