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Evaluation of Bridge-Scour Research: Abutment and Contraction Scour Processes and Prediction (2011) / Chapter Skim
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7 RECOMMENDATIONS FOR DESIGN ESTIMATION FOR ABUTMENT AND CONTRACTION SCOUR DEPTH
Pages 66-69

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From page 66...
... This distance depends on the flow distribution in the bridge opening as well as the abutment characteristics. • A small group of abutment scour formulas using the flow distribution in the bridge section or a similar independent variable are best for estimating abutment scour in compound channels.
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From page 67...
... Ettema et al.- It is the only formula that considers an erodible embankment; it has the desirable attributes of reflecting the physics of the abutment scour process both in terms of flow constriction and turbulent structures of the flow separation process albeit in a rudimentary form; and it includes experiments with compound channel geometry although a wider array of experiments is needed. It could in theory be applied to scour Classes I, II, and III channels.
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From page 68...
... Third, it is recommended that a flow chart be developed to be used as a guide to evaluate abutment scour in an informed manner and to assist the judgment of design engineers. Where a unified abutment scour formula predicts very large abutment scour depths or possible embankment failure, appropriate scour countermeasures should be indicated.
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From page 69...
... Sites without a large number of complicating factors could be identified, and full reliable data sets of simultaneous hydraulic conditions and bed elevations could be obtained to better understand field scaling issues and the simultaneous interaction of various scour processes driven by the hydrodynamics of the flow. While embarking upon such a program will be expensive and require patience, the results will move the ultimate solution to the abutment scour problem forward more effectively than less-expensive post-flood surveys.
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Key Terms

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  • scour formulas
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  • flow distribution

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  • scour due
  • setback distance
  • path forward

  • idealized contraction
  • flow depth
  • flow separation
  • unifying formula
  • independent variables

  • similar independent
  • channel geometry
  • contracted section
  • minimum setback
  • hydraulic engineers

  • useful reference
  • scour processes
  • hydraulic scour
  • acceleration caused
  • readily accessible

  • length scale
  • scour depending
  • potential scour
  • hydraulic conditions
  • simultaneous hydraulic


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