Scour at Wide Piers and Long Skewed Piers (2011) / Chapter Skim
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Pages 37-44
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The scour hole is assumed to have the idealized geometry of an inverted frustum of a C H A P T E R 5 Local Scour Evolution Predictive Methods
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= shear velocity T = transport-stage parameter T s = dimensionless time = kinematic viscosity 37 Table 12. Equations/methods for estimating local scour depth evolution with time.
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The effective shear stress in the scour hole, used in the sediment transport equation, is a function of the normalized scour depth (scour depth/equilibrium scour depth) and the structure, flow, and sediment parameters.
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y tst 0.05∝ , ( ) 28 Initial Screening of Scour Evolution Predictive Methods An initial assessment of the selected scour evolution equations was performed to see if any of the methods yielded results that were clearly unreasonable.
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, because they are very large. The computed scour evolution errors include the differences between the equilibrium scour depth that each experiment would achieve and the predicted value using the S/M equation, as well as the errors for the scour rate.
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Underprediction versus total normalized scour evolution error for wide piers (defined as y1/a < 0.5 and a/D50 > 100)
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Underprediction versus total scour evolution error for wide piers (defined as y1/a < 0.5 and a/D50 > 100)
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Time to 50%, 75%, and 90% of equilibrium scour versus flow velocity for 0.4, 1.0, and 3.0 mm sediment diameters.
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