Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Development of a Dynamic Model for Water Quality Simulation during Unsteady Flow in Water Distribution Networks

부정류 흐름에서 상수관망 수질해석을 위한 동역학적 모형의 개발

  • 최두용 (한국수자원공사 K-water 연구원) ;
  • 조원철 (연세대학교 공과대학 토목.환경공학과) ;
  • 김도환 (한국수자원공사 K-water 연구원) ;
  • 배철호 (한국수자원공사 K-water 연구원)
  • Published : 2012.10.15
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Abstract

A dynamic water quality model is presented in order to simulate water quality under slowly varying flow conditions over time. To improve numerical accuracy, the proposed model uses a lumped system approach instead of extended period simulation, unlike the other available models. This approach can achieve computational efficiency by assuming liquid and pipe walls to be rigid, unlike the method of characteristics, which has been successfully implemented in rapidly varying flows. The discrete volume method is applied to resolve the advection and reaction terms of the transport equation for water quality constituents in pipes. Numerical applications are implemented to the pipe network examples under steady and unsteady conditions as well as hydraulic and water quality simulations. The numerical results are compared with EPANET2, which is a widely used simulation model for a water distribution system. The model results are in good agreement with EPANET2 for steady-state simulation. However, the hydraulic simulation results under unsteady flows differ from those of EPANET2, which causes a deviation in water quality prediction. The proposed model is expected to be a component of an integrated operation model for a water distribution system if it is combined with a computational model for rapidly varying flows to estimate leakage, pipe roughness, and intensive water quality.

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References

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