Round-Shaped Riprap Stabilization in Overtopping Flow
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Abstract
A series of 26 tests was performed on a riprap layer in which median round-shaped stones ranging from 32.3 to (from 1.27 to ) were subjected to overtopping flow conditions. Embankment slopes range from 10 to 45% with median stone sizes ranging from 23.9 to (from 0.94 to ). The database was analyzed, yielding a unique expression in which the median size of a round-shaped stone can be predicted as a function of the unit discharge, embankment slope, and coefficient of uniformity. It was determined that the requisite round-shaped stones range from 5 to 42% larger than angular stones to stabilize the riprap layer for similar flow conditions with unit flows of and slopes of 40%. The maximum deviation between rounded and angular-shaped stone may approach 70% as flow and bed conditions are extrapolated.
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Acknowledgments
The writers wish to acknowledge the Colorado Agricultural Experiment Station for their partial support of this endeavor.
References
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Published In
Journal of Hydraulic Engineering
Volume 134 • Issue 8 • August 2008
Pages: 1035 - 1041
Copyright
© 2008 ASCE.
History
Received: Dec 2, 2005
Accepted: Nov 13, 2007
Published online: Aug 1, 2008
Published in print: Aug 2008
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