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Evaluation of Bridge-Scour Research: Abutment and Contraction Scour Processes and Prediction (2011) / Chapter Skim
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APPENDIX A
Pages 83-84

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From page 83...
... Y1 Y2 = flow depth at bridge ≈ Y1 +ds −3 / 7  τc  τc  0.25 d  Y2 β 6 / 7  β 1 / m 1 − = 8.375  +  Gill (1972) Equation given at the threshold τ1  τ1   Y1   Y1  condition F1=Froude number of the approach flow upstream of the abutment; Fc=critical  F Sturm and ds = 7.7 1 − 0.35    MF Janjua Froude number for initiation of motion;   Yf (1994)
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Key Terms

  • entrainment function
  • shields entrainment
  • conditions similar
  • bridge opening
  • opening width

  • field conditions
  • roughness component
  • grain roughness
  • critical shear
  • approach flow

  • flow depth
  • abutment encroaching
  • scour ds
  • flow upstream
  • drag coefficient

  • densimetric froude
  • function fd
  • main channel
  • flowrate applies
  • mf janjua

  • qe richardson


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