Erosion on Cohesive Deposition in Storm Sewers
Publication: Journal of Environmental Engineering
Volume 146, Issue 12
Abstract
Erosion of sediment deposition in storm sewers is dominated by the bed shear stress and the deposition characteristics. A laboratory study investigated the critical shear stress and erosion processes for different types of deposition in storm sewers. The critical shear stress increased from 0.19 to for the sand when the weight content of silt-clay changed from 0% to 20%, whereas the critical shear stress increased from 0.98 to for the sand deposition. A prediction method for the critical shear stress was developed based on the particle size and silt-clay content. The erosion patterns can be classified as ripple surface, dune surface, flat surface, and rugged surface, mainly determined by the cohesive effect, particle size, and bed shear stress. The erosion rate is a function of the sediment transport rate per unit width and particle transport distance. A field sampling program was conducted to obtain sediment deposition characteristics in a storm trunk sewer. Based on the sediment characteristics and estimated flow rate, the predicted deposition profile using the method developed in this study compared well with the field measurements.
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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 (experimental measurements).
Acknowledgments
The authors gratefully acknowledge the financial support from the Natural Sciences and Engineering Research Council (NSERC) of Canada, the City of Calgary Water Resources, and the China Scholarship Council. The authors also would like to thank Perry Fedun for assistance in constructing the model.
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Published In
Journal of Environmental Engineering
Volume 146 • Issue 12 • December 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: May 31, 2020
Accepted: Jul 28, 2020
Published online: Sep 30, 2020
Published in print: Dec 1, 2020
Discussion open until: Feb 28, 2021
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