Stress History Effects on Graded Bed Stability
Publication: Journal of Hydraulic Engineering
Volume 133, Issue 4
Abstract
This paper presents the first detailed examination of the dependence of graded bed stability on antecedent flow conditions (stress history). Thirty-three experiments, including repetitions, were undertaken where a bimodal sediment bed ( , ) was conditioned for between 30 and . The antecedent shear stress ranged from 53 to 91% of the critical shear stress for the of the sediment bed. Data indicate that higher antecedent shear stresses reduce bed stability due to selective entrainment of the fine matrix; conversely, extending the duration of the antecedent conditioning phase increases bed stability due to local particle rearrangement. Analysis of the competitive effects indicates that particle rearrangement may be of greater relative importance than compositional change. Overall, the paper demonstrates the significance of antecedent flow conditions for hydraulic engineering and research, including the modeling of bed-load transport during flood events and the need for standardizing the flume-based experimental procedure.
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Acknowledgments
Financial support for the first writer was provided by a James Watt Scholarship from Heriot-Watt University.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 133 • Issue 4 • April 2007
Pages: 343 - 349
Copyright
© 2007 ASCE.
History
Received: May 17, 2005
Accepted: Jul 18, 2006
Published online: Apr 1, 2007
Published in print: Apr 2007
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