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Evaluation of Bridge-Scour Research: Abutment and Contraction Scour Processes and Prediction (2011) / Chapter Skim
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4 SCOUR CONDITIONS
Pages 28-33

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From page 28...
... Figure 4-1b shows that the floodplain scours around the abutment, and especially slightly downstream of it. The scour hole locally destabilizes the embankment side slope, causing embankment soil, and possibly riprap, to slide into the scour hole; and, 3.
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From page 29...
... ; Scour Condition B - hydraulic scour of the floodplain causes failure of the face of the abutment embankment (b) ; and, Scour Condition C - breaching of the approach embankment exposes the abutment column so that scour progresses as if the abutment were a form of pier (c)
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From page 30...
... Will that scour depth pose a slope-stability problem for the earthfill embankment adjoining an abutment foundation or for the floodplain bank of the main channel? What is the deepest scour that could occur at the abutment column foundation itself, and does that scour occur when the embankment is breached so as to fully expose the abutment column?
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From page 31...
... Figure 4-3. Field example of Scour Condition B
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From page 32...
... Localized scour attributable to change in main channel alignment and morphology, which adversely affects abutment location and orientation relative to flow in the main channel. Lateral shift of a channel may direct flow adversely towards abutments not designed for a lateral shift in the channel thalweg.
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From page 33...
... It also could result from the upstream advance of head cutting of the channel bed, because the channel has steepened hydraulically. Bank erosion with channel widening may accompany degradation and lead to erosion attack of the embankment.
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Key Terms

  • scour conditions
  • scour depth
  • main channel
  • abutment scour
  • pier presence

  • field example
  • approach embankment
  • channel bed
  • flow contraction
  • hydraulic scour

  • abutment location
  • abutment column
  • increase flow
  • abutment embankment
  • flow field

  • pier proximity
  • usually occurs
  • condition usually
  • eventually cause
  • scour occur

  • scour deepens
  • local scour
  • deepest scour
  • scour attributable
  • localized scour

  • scour region
  • scour event
  • scour initiates
  • maximum scour
  • scour progresses


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