Unsteady Stage-Discharge Relationships for Sharp-Crested Weirs
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Volume 146, Issue 6
Abstract
Currently, discharges passing measurement devices and structures in unsteady flow conditions are determined based on relationships developed for steady flow condition due to lack of sufficient data. In this study, the operation of triangular and rectangular sharp-crested weirs in unsteady flow conditions was experimentally investigated. The compiled data indicated the presence of looped rating curves, but with transposition of the rising and falling limbs compared to that commonly observed in stream gauge ratings. The presence of such looped rating curves was justified, and the validity of the steady rating curve relationships, which are presently being applied to unsteady flow conditions, was questioned. Accordingly, relationships for evaluating unsteady discharge passing different rectangular and triangular sharp-crested weirs were presented. The proposed formulas considerably improve the discharge measurements accuracy in unsteady flow conditions and could be incorporated in hydrodynamic models.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request, including steady-state data for weirs calibration, unsteady data for UTL hydrographs, and unsteady data for MSL hydrographs.
Acknowledgments
The authors gratefully acknowledge the research facilities provided by the Center of Excellence for Evaluation and Rehabilitation of Irrigation and Drainage Networks, University of Tehran, and the Hydraulic Laboratory of Montpellier SupAgro, France.
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Journal of Irrigation and Drainage Engineering
Volume 146 • Issue 6 • June 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Apr 8, 2019
Accepted: Dec 16, 2019
Published online: Mar 28, 2020
Published in print: Jun 1, 2020
Discussion open until: Aug 28, 2020
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