Countermeasures to Protect Bridge Abutments from Scour (2007) / Chapter Skim
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1Problem Statement Most of the techniques and guidelines that are available for protecting bridge abutments against scour have been developed from small-scale, hydraulic modeling conducted in laboratories, and a limited amount of empirical data along with anecdotal observations has been acquired from field sites. Though quite useful advances have been made with scour-protection countermeasures, there is a widely recognized need for a more extensive study, one that links modeling efforts in the laboratory to priorities of countermeasure needs and to observed field performance of countermeasures.
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Countermeasure Concepts and Criteria Abutment scour can be mitigated by several approaches, including upstream or downstream channel control, armoring, flow modification, bridge modification, and drainage control. Upstream channel control can be accomplished by spur dikes, hard points, or vanes that prevent a channel from migrating laterally and thereby bypassing the bridge opening.
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depended on the protection type. Two-dimensional numerical modelling was also performed on this flow field and was found to be within about 15 percent of the experimental velocity results.
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