reference : Use of sacrificial embankments to minimize bridge damage from scour during extreme flow events

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Bibliographic fields
reftype Journal Article
Abstract The leading cause of bridge failure has often been identified as bridge scour, which is generally defined as the erosion or removal of streambed and/or bank material around bridge foundations due to flowing water. These scour critical bridges are particularly vulnerable during extreme flood events, and pose a major risk to human life, transportation infrastructure, and economic sustainability. Retrofitting the thousands of undersized and scour critical bridges to more rigorous standards is prohibitively expensive requiring effective yet economical countermeasures. This research tested the efficacy of using approach embankments as intentional sacrificial “fuses” to protect the bridge integrity and minimize damage during large flow events by allowing the streams to access their natural floodplain and reduce channel velocities. This countermeasure concept was evaluated using the Hydrologic Engineering Center’s River Analysis System models. Steady flow models were developed for three specific bridges on two river reaches. Streamflow return period estimators for both river reaches were developed using Bayesian analysis and available United States Geological Survey stream gauge data to evaluate sacrificial embankments under non-stationary climatic conditions. The use of sacrificial embankments was determined to be a cost-effective scour mitigation strategy for bridges with suboptimal hydraulic capacity and unknown or shallow foundations. Additional benefits of sacrificial embankments include reductions in upstream flood stage and velocity.
Author Brand, Matthew W.; Dewoolkar, Mandar M.; Rizzo, Donna M.
DOI 10.1007/s11069-017-2829-z
Date July 01
ISSN 1573-0840
Issue 3
Journal Natural Hazards
Pages 1469-1487
Title Use of sacrificial embankments to minimize bridge damage from scour during extreme flow events
Type of Article journal article
Volume 87
Year 2017
Bibliographic identifiers
_record_number 24537
_uuid 23149bfe-1fe5-47d6-8dd3-877f8d7a5150