Conversion from Discharge to Gate Opening for the Control of Irrigation Canals
Publication: Journal of Irrigation and Drainage Engineering
Volume 134, Issue 3
Abstract
The paper reviews several methods to convert discharge into gate opening. A control algorithm for one or several reaches of an irrigation canal sometimes uses a discharge as the control action variable even though the device to be manipulated is a gate or a weir. In this case a slave controller has to convert the discharge into a gate opening or a sill elevation in the case of a weir. This is usually done by inverting the static relation between discharge and gate opening. An improved method can be based on the characteristics theory to estimate the deviations of the water levels. However, both methods underestimate the gate opening deviations required to deliver a desired discharge deviation, because water levels vary continuously over time when the gate is operated. The paper proposes a method to take into account this dynamic behavior of the pool-gate interaction by using a simple linear model for the pools’ dynamics, the integer delay zero model. The proposed method enables us to better estimate the gate opening necessary to get a desired average discharge. The method is evaluated in simulation and on a gate of the Gignac Canal, located in the South of France. A dimensionless analysis of the problem is finally performed to evaluate the methods’ applicability.
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Acknowledgments
The writers acknowledge the financial help of Région Languedoc-Roussillon, Conseil Général de l’Hérault, Agence de l’Eau Rhône-Méditerranée-Corse and Cemagref through the “Plateforme expérimentale du canal de Gignac.” They also thank Vincent Kulesza, head of the ASA de Gignac, for his collaboration in the experiments.
References
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Information & Authors
Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 134 • Issue 3 • June 2008
Pages: 305 - 314
Copyright
© 2008 ASCE.
History
Received: Feb 19, 2007
Accepted: May 11, 2007
Published online: Jun 1, 2008
Published in print: Jun 2008
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