Scour around Double-Winged Log Frames under Clear Water Condition
Publication: Journal of Irrigation and Drainage Engineering
Volume 146, Issue 12
Abstract
In-stream low-head hydraulic structures are eco-friendly solutions to maintain the natural aquatic ecosystems. This study focused on scour characteristics around double-winged log -frames under different hydraulic conditions and structure configurations, including stone-reinforced structures. Three types of equilibrium scour morphologies were distinguished for each tested configuration. Generally, two scour formations occur upstream and downstream of the structure, depending on its configuration. Empirical equations are proposed to predict maximum depth and other characteristic lengths of the scour hole and dune. A new equivalent densimetric Froude number was derived by dimensional analysis. The equations were validated with data pertaining to similar structures. Overall, this study shows that double-winged log frames are suitable for creating resting pools for fish species, and can contribute to enhance bank stability. Although the analysis was limited to straight channels, the proposed design equations represent the first quantitative tool to assess scour features for this structure typology.
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Data Availability Statement
All data used during the study appear in the published article.
Acknowledgments
The authors thank the technicians of the hydraulics laboratory of the University of Pisa, Nicola Bruni, Antonio Cecchi, Alessandro Michelotti, and Vincenzo Pennabea, for their help in building the experimental apparatus. This research did not receive any specific grant from funding agencies.
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Journal of Irrigation and Drainage Engineering
Volume 146 • Issue 12 • December 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: May 4, 2020
Accepted: Aug 3, 2020
Published online: Sep 30, 2020
Published in print: Dec 1, 2020
Discussion open until: Feb 28, 2021
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