Protecting Vertical-Wall Abutments with Riprap Mattresses
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Volume 135, Issue 6
Abstract
This study addresses the design of riprap mattresses as a scour countermeasure near vertical-wall bridge abutments under clear water flow conditions. It specifically deals with the diameter of riprap, , the lateral extent of mattresses, , and their thickness, . Experiments were performed in a rectangular, sand-bed open channel using different abutment lengths, three riprap stone sizes, and two different sands. The minimum size of stable stones as well as the mattress dimensions depend on the ratio between the abutment length and the flow depth. New equations for the evaluation of and are suggested. The geometric properties of the scour holes which develop at the edge of riprap mattresses are similar to those reported in the literature for spill-through abutments. Although it is not possible to fully arrest scour by winnowing, the corresponding scour depth is negligible when the mattress layer thickness is at least .
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Acknowledgments
The writers wish to acknowledge the financial support of the Portuguese Foundation for Science and Technology, through Grant No. UNSPECIFIEDPOCI/ECM/59544/2004.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 135 • Issue 6 • June 2009
Pages: 457 - 465
Copyright
© 2009 ASCE.
History
Received: Dec 4, 2007
Accepted: Dec 12, 2008
Published online: May 15, 2009
Published in print: Jun 2009
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