Simulation Study on the Influence of Roughness on the Downstream Automatic Control of an Irrigation Canal
Publication: Journal of Irrigation and Drainage Engineering
Volume 138, Issue 4
Abstract
The controllability of an irrigation canal depends on its physical characteristics, on the control algorithm used, and on the actual condition of the canal in relation to the algorithm tuning conditions. The flow conditions and controllability in an irrigation canal may change if the hydraulic friction changes. Great variations in friction were observed in an irrigation canal in Spain owing to the presence of Rhizoclonium hieroglyphicum, a type of algae that grows in clear water. Such large variations in friction may have a significant effect on the stability and performance of automatic canal controllers. Using the unsteady-state model Simulation of Irrigation Canal (SIC), the influence of roughness on the performance of the study canal under distant downstream control of its four coupled pools was investigated. A set of proportional-integral (PI) controllers was tuned for different values of Manning's . The controller’s performance under real conditions is sensitive to the roughness conditions under which the control gains were tuned, and a method to robustly tune the gains of the PI controllers is proposed.
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Acknowledgments
This study was supported by the research project “Control y automatización de canales de riego,” funded by the Instituto Andaluz de Reforma Agraria (Junta de Andalucía, Spain). The authors thank Daniel Lozano and Jean-Pierre Baume for their assistance and Julia Toja and Maria Gabriela Cano for helping to identify the algae R. hieroglyphicum. The collaboration between authors was supported by the French National Research Agency under the project Algequeau (ANR-06-ECOT-001).
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Information & Authors
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Published In
Journal of Irrigation and Drainage Engineering
Volume 138 • Issue 4 • April 2012
Pages: 285 - 293
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Mar 14, 2011
Accepted: Aug 31, 2011
Published online: Aug 31, 2011
Published in print: Apr 1, 2012
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