Abstract
Weirs are structures that allow uppermost layers of liquids to flow by gravity downstream. They are, therefore, inherently gravity skimmers, and have successfully been used as skimmers in numerous applications, including oil-spill cleanup and various stormwater and wastewater treatment operations. This study examines the hydraulic skimming properties of sharp-crested weirs. The skimming properties of basic rectangular, triangular, and trapezoidal weirs are first characterized with a nondimensional skimming function. The triangular V-notch weir is shown to be a superior skimmer when compared to the other basic weirs. The V-notch weir has a maximum skimming rate , occurring at an elevation . Considerable enhancements of skimming properties are, however, achieved with higher order polynomial weirs. Polynomial weirs of order have maximum skimming rates , occurring at desirable elevations . The results of this work can be applied to design high performing sharp-crested skimmer weir outlets.
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Data Availability Statement
No data, models, or code were generated or used during the study.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 146 • Issue 9 • September 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Jan 23, 2020
Accepted: May 18, 2020
Published online: Jul 10, 2020
Published in print: Sep 1, 2020
Discussion open until: Dec 10, 2020
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