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A New Indicator for Unsteady Flow Analysis in Pressurized Irrigation Systems

Author

Listed:
  • Nicola Lamaddalena

    (CIHEAM - Mediterranean Agronomic Institute)

  • Roula Khadra

    (CIHEAM - Mediterranean Agronomic Institute)

  • Bilal Derardja

    (CIHEAM - Mediterranean Agronomic Institute)

  • Umberto Fratino

    (Polytechnic University of Bari)

Abstract

Pressurized irrigation systems operating on-demand offer large flexibility to farmers for managing their irrigation practices. Within these systems, the fast moving water and the sudden closing of hydrants generates unsteady flow and may create a significant pressure variation in the pipes causing noise, vibration and, sometimes, also pipes’ collapse. The present study describes a simulation tool that was developed for the analysis of unsteady flow effects. A large number of configurations of hydrants simultaneously open has been used to reflect farmers’ behaviour. A new indicator, called Relative Pressure Variation (RPV), was proposed to evaluate the pressure variation occurring into the system in respect to the steady-state pressure. This is very relevant and can be used to identify pipes with potential risk of failure. In addition, an analysis with different gate-valves’ closing time was carried out. It demonstrated that closing time shorter than Tc = 3 s may create dangerous pressures for the pipes.

Suggested Citation

  • Nicola Lamaddalena & Roula Khadra & Bilal Derardja & Umberto Fratino, 2018. "A New Indicator for Unsteady Flow Analysis in Pressurized Irrigation Systems," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 32(9), pages 3219-3232, July.
    • Handle: RePEc:spr:waterr:v:32:y:2018:i:9:d:10.1007_s11269-018-1987-4
    DOI: 10.1007/s11269-018-1987-4
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    References listed on IDEAS

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    1. Lamaddalena, Nicola & Pereira, Luis Santos, 2007. "Pressure-driven modeling for performance analysis of irrigation systems operating on demand," Agricultural Water Management, Elsevier, vol. 90(1-2), pages 36-44, May.
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    Cited by:

    1. Giacomo Ferrarese & Alessandro Pagano & Umberto Fratino & Stefano Malavasi, 2021. "Improving Operation of Pressurized Irrigation Systems by an Off-grid Control Devices Network," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 35(9), pages 2813-2827, July.
    2. Sara Azargashb Lord & Seied Mehdy Hashemy Shahdany & Abbas Roozbahani, 2021. "Minimization of Operational and Seepage Losses in Agricultural Water Distribution Systems Using the Ant Colony Optimization," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 35(3), pages 827-846, February.

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