Supercritical Flow Measurement Using a Large Parshall Flume
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Volume 139, Issue 8
Abstract
A full-prototype physical model was laboratory tested to determine a rating equation applicable to large Parshall flumes with supercritical flow. The experimental program was composed of a 1.5-m (5-ft.) Parshall flume configuration and included 11 tests with discharges up to (30.15 cfs) and Froude numbers varying from 0.67–1.31. The resulting 1.5-m (5-ft) Parshall flume data were compared to existing rating equations for predicting discharge in a Parshall flume with subcritical and supercritical flow. A new rating equation specific to supercritical flow in large Parshall flumes was developed. Further, an analysis was conducted, which determined that varying regression coefficients on an existing supercritical flow-rating equation also produced an accurate rating equation for large Parshall flumes. A convergence ratio was defined and used to determine the flow regime within the flume where the 1.5-m (5-ft) Parshall flume data, combined with previously-published small Parshall flume data, indicated three convergence ratio zones: (1) subcritical, (2) transition, and (3) supercritical. Guidance was provided for rating equation selection based on the convergence ratio zone and flume size.
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Acknowledgments
This project was funded, in part, by the National Park Service (U. S. Department of the Interior) through Contract No. CA238099001.
References
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Information & Authors
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Published In
Journal of Irrigation and Drainage Engineering
Volume 139 • Issue 8 • August 2013
Pages: 655 - 662
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Nov 12, 2012
Accepted: Feb 19, 2013
Published online: Feb 21, 2013
Published in print: Aug 1, 2013
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