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Evaluation of Bridge-Scour Research: Abutment and Contraction Scour Processes and Prediction (2011) / Chapter Skim
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8 RESEARCH AND EDUCATION NEEDS
Pages 70-74

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From page 70...
... , filling existing data gaps, and for diagnostic comparison with selected field investigations; ii. Forensic field investigations of abutment failures during significant flood events at bridges featuring particular abutment types; and, iii.
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From page 71...
... for determining Critical studies flow distribution through bridge waterways for the short term combined with 3D CFD models and laboratory turbulence measurements to shed further light on hydraulic model scaling issue for the long term N2. Education of engineers concerning limitations of 1D abutment scour High prediction formulas and the potential and applicability of 2D and 3D numerical modeling in combination with laboratory hydraulic modeling 8.3 DESIGN ESTIMATION OF SCOUR Before outlining research tasks to improve design methodology as an integral part of the research needs outlined in the previous section, it is useful to refer back to the essential question raised in Section 3.3 – How should abutment design best take abutment scour into account?
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From page 72...
... These methods both treat abutment scour as an amplification of contraction scour, but the adjustment coefficients reflecting effects of turbulence need to be unified, and less physically based adjustment coefficients that lack specific experimental validation need to be re-evaluated. In addition, geotechnical scaling of laboratory results for erodible embankments to the field require estimation of laboratory embankment strength and erodibility ii.
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From page 73...
... 8.4 MONITORING AND MAINTENANCE OF BRIDGE ABUTMENTS Numerous scour-induced failures of bridge abutments often result as a consequence of inadequate monitoring and maintenance of approach channel features (especially the lateral shifting of a channel) , and concomitantly at times the deterioration of the abutment embankment (as can be caused by inadequate handling of drains along embankment flanks)
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From page 74...
... Development of instrumentation and techniques for determining abutment state during extreme flood-flow events; iii. Education of appropriate technical staff about abutment scour processes including those linked to changes in channel alignment and abutment condition (exposure to flow, geotechnical weakening)
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Key Terms

  • scour depth
  • abutment design
  • scour processes
  • field studies
  • method veracity

  • studies determine
  • abutment failure
  • bridge waterway
  • bridge abutments
  • diagnostic field

  • design estimation
  • research tasks
  • determine method
  • addressing improved
  • avert abutment

  • abutment types
  • abutment column
  • maximum scour
  • scour depths
  • improved design

  • regarding scour
  • erodible embankments
  • estimation methods
  • parameters determining
  • potential maximum

  • adjustment coefficients
  • primary research
  • bridge waterways
  • inadequate monitoring
  • methods proposed


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