Revisiting the Energy-Momentum Method for Rating Vertical Sluice Gates under Submerged Flow Conditions
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VIEW THE REPLYPublication: Journal of Irrigation and Drainage Engineering
Volume 139, Issue 4
Abstract
Submerged sluice gates may be used as discharge measuring structures in irrigation channels. One commonly used model to predict discharge under submerged gates is based on the simultaneous solution of the energy and momentum equations (EM method). The conventional assumption for the solution is that the roller forming downstream of the gate is a static bubble of water with zero net flux of both momentum and kinetic energy. Energy losses along the submerged gate flow are commonly neglected. In this study, rational analysis of the EM method shows that the roller momentum flux and the energy loss may be considerable. A novel formulation of the EM method accounting for these two phenomena is proposed. Although it yields results similar to those of the conventional method, the new method introduces rationality in the application of the EM equations for submerged gate flow and helped to critically revise the assumptions in which the conventional EM method is based.
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Acknowledgments
The authors would like to express their gratitude to IIHR-Hydroscience and Engineering Archives, Iowa City, in particular to archivist Dr. Connie Mutel for providing reprints of the theses of Liu (1949) and Henry (1950). The excellent suggestions and comments received from Prof. W.H. Hager, ETH Zurich, are acknowledged. The critical comments of the reviewers of this work helped to make a more precise presentation of the critical assessment presented in this work, for which the authors are grateful.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 139 • Issue 4 • April 2013
Pages: 325 - 335
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Feb 29, 2012
Accepted: Oct 9, 2012
Published online: Oct 11, 2012
Published in print: Apr 1, 2013
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