Supervision and Water Depth Automatic Control of an Irrigation Canal
Publication: Journal of Irrigation and Drainage Engineering
Volume 136, Issue 1
Abstract
A supervisory and control system developed for a Portuguese irrigation canal system equipped with motorized sluice gates and buffer reservoirs is presented. The article discusses the development and tuning of the canal system’s controllers: manual controllers for direct control of gate position and gate flow controllers, which maintain discharge at predefined values; automatic controllers for water depth control upstream from check structures. System hydraulics was simulated using an unsteady flow open-channel model based on the complete Saint-Venant equations. After field calibration and validation, the model was used for tuning the water depth controllers. The automatic upstream water depth control is based on local proportional-integral controllers. Controller gains were determined using optimization tools provided by the hydraulic simulator. These procedures tune the controller parameters globally, considering a given set of inflow variations. Finally, the paper presents simulated control tests results and an analysis of controller performances. Under the test conditions, the controller was able to drive water levels back to their setpoint rapidly and without instabilities and also guaranteeing stable gates movement.
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Acknowledgments
The present study was supported by the “Fundação para a Ciência e Tecnologia” through the Grant No. UNSPECIFIEDPOCTI/GG/44060/2002. The writers also express gratitude to the EDIA S.A. for the available data.
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Information & Authors
Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 136 • Issue 1 • January 2010
Pages: 3 - 10
Copyright
© 2010 ASCE.
History
Received: Apr 16, 2008
Accepted: May 11, 2009
Published online: May 13, 2009
Published in print: Jan 2010
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