American Society of Civil Engineers


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


by Oscar Castro-Orgaz, (corresponding author), (Hydraulic Research Scientist, Instituto de Agricultura Sostenible, CSIC, Apdo 4084, Alameda del Obispo s/n, 14080 Cordoba, Spain E-mail: oscarcastro@ias.csic.es), David Lozano, (Research Hydraulic Engineer, Instituto de Agricultura Sostenible, CSIC, Apdo 4084, Alameda del Obispo s/n, 14080 Cordoba, Spain. E-mail: l52loped@uco.es), and Luciano Mateos, M.ASCE, (Research Scientist, Instituto de Agricultura Sostenible, CSIC, Apdo 4084, Alameda del Obispo s/n, 14080 Cordoba, Spain. E-mail: ag1mainl@uco.es)

Journal of Irrigation and Drainage Engineering, Vol. 136, No. 9, September 2010, pp. 610-616, (doi:  http://dx.doi.org/10.1061/(ASCE)IR.1943-4774.0000233)

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Document type: Journal Paper
Discussion: by M. Bijankhan E-mail: bijankhan@ut.ac.ir and et al.    (See full record)
Discussion: by A. Habibzadeh E-mail: habibzad@ualberta.ca and et al.    (See full record)
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Abstract: There 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.


ASCE Subject Headings:
Canals
Gates
Calibration
Open channel flow
Irrigation
Energy
Velocity
Coefficients

Author Keywords:
Canal gates
Hydraulic calibration
Open channel flow