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Scour at Wide Piers and Long Skewed Piers (2011) / Chapter Skim
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Chapter 2 - Research Approach
Pages 6-7

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From page 6...
... For sediment transport and local sediment scour, the ratio of flow velocity to the velocity required to initiate sediment movement on a flat stream bed, V1/Vc, is important, etc. The range of the dimensionless groups more commonly used to characterize local scour covered by the compiled data sets is given in Table 1.
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From page 7...
... Range of values of the dimensionless groups covered by the compiled data sets. Data Type y1/a a/D50 V1/Vc 1 1V / y g Equilibrium Laboratory 0.05 to 21.05 3.65 to 4159 0.40 to 5.99 0.07 to 1.50 Equilibrium Field 0.18 to 9.67 8.33 to 65047 0.13 to 7.58 0.03 to 1.95 Laboratory Scour Evolution 0.09 to 11.11 6.72 to 4159 0.46 to 5.99 0.07 to 1.76 y1 = the approach water depth V1 = the depth-averaged velocity a = the structure width Vc = the sediment critical depth-averaged velocity D50 = the median sediment grain diameter g = the acceleration of gravity.
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Key Terms

  • equilibrium scour
  • local scour
  • field data
  • scour data
  • scour depth

  • scour depths
  • evolution data
  • bed shear
  • compiled data
  • remaining equations

  • flow velocity
  • mean values
  • evolution equations
  • skewed piers
  • shear stress

  • initial screening
  • equilibrium local
  • scour regime
  • scour measurements
  • laboratory scour

  • sediment scour
  • scour covered
  • scour equations
  • accurate scour
  • evolution scour

  • major effects
  • laboratory data
  • screening procedure
  • surface wave
  • mean produced


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