Estimating Foundation Scour for Extreme Hydrologic Events at Scour Critical Bridges
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2016-02-01
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TRIS Online Accession Number:01592076
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Edition:Final Report
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Abstract:During extreme hydrologic events, bridges may be subjected to submerged orifice flow and overtopping because they were not designed for such large flows. As a result, such bridges are vulnerable to excessive scour of the foundations and possible failure. The objective of this research is to examine both the hydrodynamics of the flow and the scour resistance of fine sediments to improve prediction of scour depths under extreme flooding conditions. The research approach is three-pronged: (1) experimental measurement of the scour depths and flow field in a large compound channel flume; (2) application of computational fluid dynamics to predict the turbulence properties of the flow field; and (3) testing of laboratory mixtures of fine sediments to develop a relationship for critical shear stress at the threshold of scour. Results of these three tasks are combined to form a procedure for scour prediction that considers both the causative and resistive factors in the complex process of bridge scour.
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