Hydraulic Design and Analysis of Labyrinth Weirs. II: Nappe Aeration, Instability, and Vibration
Publication: Journal of Irrigation and Drainage Engineering
Volume 139, Issue 5
Abstract
Nappe behavior should be considered in the design of labyrinth weirs to ensure hydraulic optimization and to account for potential vibrations, pressure fluctuations, noise, and flow surging. Information regarding nappe aeration conditions (clinging, aerated, partially aerated, and drowned), nappe instability, and nappe vibrations for trapezoidal labyrinth weirs on a horizontal apron with quarter- and half-round crests () is presented. Corresponding headwater ratio ranges and hydraulic behaviors associated with nappe aeration conditions are documented and discussed to aid in labyrinth weirs design, including design options directly related to nappe behavior (e.g., crest shape, crest roughness, vents, nappe breakers, notches, and staged cycles). The effects of artificial nappe aeration (a vented nappe) on nappe behavior and discharge capacity are also discussed, including recommended placements of nappe breakers.
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Acknowledgments
Funding for this study was provided by the State of Utah and the Utah Water Research Laboratory (Utah State University).
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Information & Authors
Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 139 • Issue 5 • May 2013
Pages: 371 - 377
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jul 6, 2011
Accepted: Oct 9, 2012
Published online: Oct 11, 2012
Published in print: May 1, 2013
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