Subaqueous Barchans and Plane Beds from Deposition of Quartz Silt
Publication: Journal of Hydraulic Engineering
Volume 142, Issue 12
Abstract
The suspension flow of quartz silt (geometric mean grain size of 4.15 μm), in unfavorable conditions for deposition, is the motivation for the development of different bed morphologies. Particles deposit over a plane nonerodible surface and develop well-defined barchan ripples, barchanoids, and plane beds in flume experiments. Bedload transport of quartz silt by bedform migration is several orders of magnitude smaller than the suspended transport. The final bed morphology is controlled by the suspended sediment concentration and running time of the experiment. The average dimensions of the bedforms after 1-day experiments are 4.93 cm wide, 10.33 cm long, and 0.45 cm high. Cohesive plane beds appear after 2-day and 3-day experiments with very high sediment concentrations (). Viscous effects are deemed relevant for the formation of the beds.
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Acknowledgments
The authors thank the editors and the reviewers for their valuable comments. The authors note that there are no data sharing issues.
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Published In
Journal of Hydraulic Engineering
Volume 142 • Issue 12 • December 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Sep 7, 2015
Accepted: May 24, 2016
Published online: Aug 3, 2016
Published in print: Dec 1, 2016
Discussion open until: Jan 3, 2017
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