Closed-Form Expression of the Response Time of an Open Channel
Publication: Journal of Irrigation and Drainage Engineering
Volume 136, Issue 10
Abstract
Computing accurately the response time of an open channel is of extreme importance for management operations on canal networks, such as feed-forward control problems. The methods proposed in the literature to approximate the response time do not always account for the influence of a cross structure at the downstream end of a canal pool, which may have a significant impact on the response time. This paper proposes a new approach to compute the response time, accounting explicitly for the backwater and the feedback effects due to the downstream cross structure. The method provides a distributed analytical expression of the response time as a function of the characteristics of the canal (geometry, roughness) and of the downstream cross structure. A test canal with a weir or a gate at the downstream end is used to compare the new method with some of the others. Results show that the proposed expression accurately reproduces the response time for various backwater and downstream boundary conditions.
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Acknowledgments
This work was jointly supported by Region Languedoc Roussillon and Cemagref within the Ph.D. thesis of Simon Munier, under the supervision of X. Litrico and G. Belaud.
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Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 136 • Issue 10 • October 2010
Pages: 677 - 684
Copyright
© 2010 ASCE.
History
Received: May 25, 2009
Accepted: Mar 2, 2010
Published online: Mar 4, 2010
Published in print: Oct 2010
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