Transitional Flow between Orifice and Nonorifice Regimes at a Rectangular Sluice Gate
Publication: Journal of Irrigation and Drainage Engineering
Volume 135, Issue 3
Abstract
The hydraulic transition between nonorifice and orifice flow regimes at a rectangular sluice gate was analyzed to determine the value of a coefficient used to define the threshold between the two regimes. The transition coefficient was defined as the ratio of vertical gate opening to upstream water depth. Several dozen data sets were collected in a hydraulic laboratory, each including the measurement of upstream and downstream water depth for five different vertical gate openings, and 17 different steady-state discharges from . Various approaches were tested to define the limits of the nonorifice-to-orifice regime transition, but the one presented herein uses the specific-energy equation for open-channel flow. After the transition limits were defined, an estimation of the nonorifice-to-orifice transition coefficient, , was made. The experimental results indicate that orifice flow always exists when is less than 0.83, and nonorifice flow always exists when is greater than 1.00. A procedure was developed to determine the flow regime and the discharge at a rectangular gate in the range .
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Acknowledgments
The writers are grateful for the support provided by the Utah Agricultural Experiment Station, UNSPECIFIEDProject AES 788, and support from Dr. Michael Johnson and Mr. Alan Taylor of the Utah Water Research Laboratory.
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© 2009 ASCE.
History
Received: Apr 30, 2008
Accepted: Oct 16, 2008
Published online: May 15, 2009
Published in print: Jun 2009
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