Clear-Water Scour at Comparatively Large Cylindrical Piers

AbstractNew long-duration clear-water scour data were collected at single cylindrical piers with the objective of investigating the effect of sediment coarseness, Dp/D50 (Dp = pier diameter; D50 = median grain size) on the equilibrium scour depth and improving the scour depth time evolution modeling...

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Bibliographic Details
Published in:Journal of hydraulic engineering (New York, N.Y.) N.Y.), 2013-11, Vol.139 (11), p.1117-1125
Main Authors: Lança, Rui M, Fael, Cristina S, Maia, Rodrigo J, Pêgo, João P, Cardoso, António H
Format: Article
Language:English
Subjects:
Applied sciences
Bridge elements
Bridges
Buildings. Public works
Coarseness
Evolution
Exact sciences and technology
Grain size
Hydraulic engineering
Piers
Scouring
Sediments
Technical Papers
Thresholds
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Summary:AbstractNew long-duration clear-water scour data were collected at single cylindrical piers with the objective of investigating the effect of sediment coarseness, Dp/D50 (Dp = pier diameter; D50 = median grain size) on the equilibrium scour depth and improving the scour depth time evolution modeling by making use of the exponential function suggested in the literature. Experiments were carried out for the flow intensity close to the threshold condition of initiation of sediment motion, imposing wide changes of sediment coarseness and flow shallowness, d/Dp (d = approach flow depth). The effect of sediment coarseness on the equilibrium scour depth was identified; existing predictors were modified to incorporate this effect for U/Uc≈1.0; Dp/D50>≈60 and d/Dp≥0.5; the complete characterization of a known scour depth time evolution model was achieved for U/Uc≈1.0, 60
ISSN:0733-9429
1943-7900
DOI:10.1061/(ASCE)HY.1943-7900.0000788