Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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A Numerical Method to Calculate Drainage Time in Large Transmission Pipelines Filter

대구경 관로의 배수시간 산정을 위한 수치해석 기법

  • 신병호 (한국수자원공사 수도권수도건설단) ;
  • 최두용 (한국수자원공사 K-water 융합연구원) ;
  • 정관수 (충남대학교 토목공학과)
  • Received : 2017.10.11
  • Accepted : 2017.10.19
  • Published : 2017.12.15
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Abstract

Multi-regional water supply system, which installed for supplying multiple water demands, is characterized by large-sized, long-distance, tree-type layout. This system is vulnerable to long-standing service interruption when a pipe breaks is occurred. In this study, a numerical method is proposed to calculate drainage time that directly affects time of service interruption. To begin with, governing equations are formulated to embed the delayed drainage effect by the friction loss, and to resolve complicated connection of pipelines, which are derived from the continuity and energy equations. The nonlinear hydraulic equations are solved by using explicit time integration method and the Newton-Raphson method. The developed model is verified by comparing the result with analytical solution. Furthermore, the model's applicability is validated by the examples of pipelines in serial, in parallel, and complex layout. Finally, the model is utilized to suggest an appropriate actions to reduce the deviation of draining time in the C transmission line of the B multi-regional water supply system.

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References

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