Riprap Design for Overtopping Flow
Publication: Journal of Hydraulic Engineering
Volume 117, Issue 8
Abstract
Near‐prototype flume studies were conducted in which riprap‐protected embankments were subjected to overtopping flows. Embankment slopes of 1, 2, 8, 10, and 20% were covered with riprap layers with median stone sizes of 1, 2, 4, 5, and/or 6 in. Each riprap layer was tested by slowly increasing the discharge to failure. Riprap design criteria for overtopping flows were developed for estimating incipient stone movement and riprap layer failure as a function of the unit discharge, stone shape, median stone size, and embankment slope. Incipient stone movement occurred at approximately 74% of the riprap layer failure unit discharge. It was determined that rounded shape stone should be oversized approximately 40% to provide comparable protection of an angular shape stone. Flow channelization was observed to occur at approximately 88% of the unit discharge at failure. A flow concentration factor of approximately 1 to 3 was introduced for sizing stone.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 117 • Issue 8 • August 1991
Pages: 959 - 972
Copyright
Copyright © 1991 ASCE.
History
Published online: Aug 1, 1991
Published in print: Aug 1991
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