Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Simulations of Thermal Stratification of Daecheong Reservoir using Three-dimensional ELCOM Model

3차원 ELCOM 모형을 이용한 대청호 수온성층 모의

  • Chung, Se Woong (Department of Environmental Engineering, Chungbuk National University) ;
  • Lee, Heung Soo (Department of Environmental Engineering, Chungbuk National University) ;
  • Choi, Jung Kyu (Department of Environmental Engineering, Chungbuk National University) ;
  • Ryu, In Gu (Department of Environmental Engineering, Chungbuk National University)
  • Received : 2009.08.04
  • Accepted : 2009.09.17
  • Published : 2009.11.30
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Abstract

The transport of contaminants and spatial variation in a deep reservoir are certainly governed by the thermal structure of the reservoir. There has been continuous efforts to utilize three-dimensional (3D) hydrodynamic and water quality models for supporting reservoir management, but the efforts to validate the models performance using extensive field data were rare. The study was aimed to evaluate a 3D hydrodynamic model, ELCOM, in Daecheong Reservoir for simulating heat fluxes and stratification processes under hydrological years of 2001, 2006, 2008, and to assess the impact of internal wave on the reservoir mixing. The model showed satisfactory performance in simulating the water temperature profiles: the absolute mean errors at R3 (Hoenam) and R4 (Dam) sites were in the range of $1.38{\sim}1.682^{\circ}C$. The evaporative and sensible heat losses through the reservoir surface were maximum during August and January, respectively. The net heat flux ($H_n$) was positive from February to September, while the stratification formed from May and continued until September. Instant vertical mixing was observed in the reservoir during strong wind events at R4, and the model reasonably reproduced the mixing events. A digital low-pass filter and zero crossing method was used to evaluate the potential impact of wind-driven internal wave on the reservoir mixing. The results indicated that most of the wind events occurred in 2001, 2006, 2008 were not enough to develop persistent internal wave and effective mixing in the reservoir. ELCOM is a suitable 3D model for supporting water quality management of the deep and stratified reservoirs.

Keywords

Acknowledgement

Supported by : 충북대학교

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