DOI QR코드

DOI QR Code

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

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.

Keywords

References

  1. American Water Works Assocication(AWWA) (1986). Introduction to Water Distribution, Volume 3. AWWA, Denver, CO.
  2. American Water Works Assocication(AWWA) (1996). Water Transmission and Distribution, Second Edition. AWWA, Denver, CO.
  3. Bouchart, F. and Goulter, I. (1991). "Reliability improvements in design of water distribution networks recognizing valve location." Water Resources Research, Vol. 27, No. 12, pp. 3029-3040. https://doi.org/10.1029/91WR00590
  4. Jun, H. D. (2005). "Isolating subsystems by valves in a water distribution system and evaluating the system performance."J. of Korea Water Res. Assoc., KWRA, Vol. 38, No. 7, pp. 585-593 (in Korean). https://doi.org/10.3741/JKWRA.2005.38.7.585
  5. Jun, H. D. (2006). "An evaluation of the pipe failure impact in a water distribution system considering subsystem isolation."J. of Korea Water Res. Assoc., KWRA, Vol. 39, No. 2, pp. 89-98 (in Korean). https://doi.org/10.3741/JKWRA.2006.39.2.089
  6. Kim, S.-W., Kim, D., Choi, D. Y., Kim, J. (2013). "A study on the method of energy evaluation in water supply networks."J. of Korea Water Res. Assoc., KWRA, Vol. 46, No. 7, pp. 745-754 (in Korean). https://doi.org/10.3741/JKWRA.2013.46.7.745
  7. Lee, D. H., Kim, J. H., Chung, G. (2017). "Friction loss of multi-purpose stormwater tunnel simulated by Flow 3D."Journal of the Korea Academia-Industrial cooperation Society, Vol. 18, No. 3, pp. 14-21 (in Korean). https://doi.org/10.5762/KAIS.2017.18.3.14
  8. Ministry of Environment(MoE) (2010). Korean Standard for Waterworks Facilities. Seoul, Korea (in Korean).
  9. Rossman, L.A. (2000). EPANET2: User's manual. U.S. EPA, Cincinnati, OH.
  10. Walski, T. M. (1993). "Water distribution valve topoplogy for reliability analysis." Reliability Engieering and System Safety, Vol. 42, pp. 21-27. https://doi.org/10.1016/0951-8320(93)90051-Y
  11. Walski, T. M. (2002). "Issues in providing reliability in water distribution systems" Proceedings of the ASCE Environmental and Water Resources Institute(EWRI) Annual Conference, Reston, VA.