Hydraulic implications of variable-rate irrigation

Paper

Msibi, Trevor, Foley, Joseph and Gillies, Malcolm. 2019. "Hydraulic implications of variable-rate irrigation." 41st Annual Conference of the Australian Society of Sugar Cane Technologists (ASSCT 2019). Toowoomba, Australia 30 Apr - 03 May 2019 Australia.
Paper/Presentation Title

Hydraulic implications of variable-rate irrigation

Presentation TypePaper
AuthorsMsibi, Trevor, Foley, Joseph and Gillies, Malcolm
Journal or Proceedings TitleProceedings of the 41st Annual Conference of the Australian Society of Sugar Cane Technologists (ASSCT 2019)
Journal Citationpp. 269-269
Number of Pages1
Year2019
Place of PublicationAustralia
Conference/Event41st Annual Conference of the Australian Society of Sugar Cane Technologists (ASSCT 2019)
Event Details
41st Annual Conference of the Australian Society of Sugar Cane Technologists (ASSCT 2019)
Parent
Australian Society of Sugar Cane Technologists Conference
Delivery
In person
Event Date
30 Apr 2019 to end of 03 May 2019
Event Location
Toowoomba, Australia
Event Web Address (URL)
Abstract

Centre-pivot (CP) and lateral-move (LM) irrigation machines can now be retrofitted with variable-rate irrigation (VRI) technology to spatially vary irrigation depths by pulsing and cycling flow into sprinkler heads using electrically actuated solenoid valves to meet specific irrigation requirements in discrete management zones. However, despite the proposition that this technology can offer benefits in terms of water use and energy consumption, the hydraulic impacts of retrofitting the VRI on these machines have not been assessed.
Laboratory experiments were conducted using an automated computer-controlled test rig integrating a data-acquisition system written in LabVIEW to determine the hydraulic characteristics of solenoid-actuated VRI valves and their impacts on the performance of CP and LM pressure regulators.
Results show that the minor head loss for VRI valves is a maximum 3.6 m head for CP and LM nozzle discharge rates and may suggest the need for improvements in hydraulic systems supplying VRI machines especially those irrigating fields with moderate variability. Depending on the discharge and duty cycle, the on-and-off pulsing of VRI valves generate pressure-wave transients of magnitudes that can be 4–6 times greater than the system
operating pressure. These pressure transients cause variations greater than ±1.0 m in regulated pressure, which is likely to affect sprinkler performance and the resulting water-application depths, in addition to posing threats on equipment safety.
Consequently, for precise and accurate spatially variable applications, the pressure transients and unsteady conditions from VRI will need to be controlled, which together with the need to account for the additional valve head loss implies a significant cost towards successful implementation of VRI systems.

KeywordsIrrigation, centre-pivot, lateral-move, variable-rate irrigation
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020409901. Agricultural engineering
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Byline AffiliationsCentre for Agricultural Engineering
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