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Title

Energy and Momentum Velocity Coefficients for Calibrating Submerged Sluice Gates in Irrigation Canals

AuthorsCastro-Orgaz, Óscar ; Lozano, María Dolores ; Mateos, Luciano
KeywordsCanal gates
Hydraulic calibration
Open channel flow
Issue Date19-Feb-2010
PublisherAmerican Society of Civil Engineers
CitationJournal of Irrigation and Drainage Engineering 136(9): 610-616 (2010)
AbstractThere is renewed interest in developing calibration methods for gates operating in submerged conditions in irrigation canals. In the present study, a new method based on a generalization of the standard energy-momentum method that accounts for variations in the energy and momentum velocity coefficients is proposed, for the following reasons. First, it was found that the assumption of uniform submerged jet velocity to account for the kinetic energy head and momentum flux is in reality equivalent to assuming a parabolic relationship between the Coriolis and Boussinesq coefficients. Second, literature investigations showed that the coefficients for the downstream side of submerged gates are notably greater than unity, and the implicit parabolic relationship between these coefficients in the standard energy-momentum method is inadequate, at least for high submergence conditions. The proposed energy-momentum method was evaluated using the data obtained from four gates operating in an irrigation canal in Southern Spain. Improvements in accuracy compared to the standard energy-momentum method (with a constant contraction coefficient Cc=0.61 ) were obtained. The results indicate that the calibration of coefficient approach provides a means to improve the energy-momentum method by (indirectly) accounting more accurately for nonuniform velocity effects in the energy-momentum equations.
URIhttp://hdl.handle.net/10261/87763
DOI10.1061/(ASCE)IR.1943-4774.0000233
Identifiersdoi: 10.1061/(ASCE)IR.1943-4774.0000233
issn: 0733-9437
e-issn: 1943-4774
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