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Rights & Permissions Free PDF Access Sign in to download PDF book and chapters Free Resources Display this book on your site! Related Titles NCHRP Report 516: Pier and Contraction Scour in Cohesive Soils NCHRP Report 515: Portable Scour Monitoring Equipment Other Related Titles NCHRP Report 682: Scour at Wide Piers and Long Skewed Piers (2011) National Cooperative Highway Research Program (NCHRP) Citation Manager Export the bibliographic data for this book in your chosen format Web Search Builder Use this book's key terms to search within this book, across our collection, or across the Web. Skim This Chapter Skim this chapter and use this chapter's key terms to search within this book. Reference Finder Paste in your own text to find books that relate to your topic. Citation Manager Melville, Bruce, Sheppard, D Max, Demir, Huseyin, Transportation Research Board. "List of Symbols." NCHRP Report 682: Scour at Wide Piers and Long Skewed Piers. Washington, DC: The National Academies Press, 2011. Please select a format: Page 53   E-mail Share on facebook Facebook Share on delicious Delicious Share on stumbleupon Stumble Share on twitter Twitter More Sharing ServicesMore Page 53 Front Matter (R1-R9) Summary (1-3) Project Description (4-4) Report Organization (5-5) Chapter 2 - Research Approach (6-7) Equilibrium Local Scour Data (8-8) Assessment of Data Quality (9-13) Local Scour Evolution Data (14-15) Introduction (16-18) Initial Screening of Equilibrium Scour Predictive Equations (19-23) Modifications to Equilibrium Scour Predictive Methods (24-25) Evaluation of Equilibrium Scour Predictive Methods (26-36) Introduction (37-39) Modifications of Scour Evolution Predictive Methods (40-40) Final Evaluation of Scour Evolution Predictive Methods (41-44) Chapter 6 - Scour at Piers Skewed to the Flow (45-47) Summary (48-49) Recommendations for Future Research (50-50) References (51-52) List of Symbols (53-54) Appendices (55-55) Abbreviations used without definitions in TRB publications (56-56)

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OCR for page 53
53 LIST OF SYMBOLS Symbol Description Units Dimensions a Pier width ft (m) L a* Projected width of pier ft (m) L B Rectangular channel width ft (m) L D50 Median grain diameter mm L Fdi Densimetric particle Froude number for -- -- inception of scour Fr Froude Number of the approach flow -- -- Frc Critical Froude Number of the approach flow -- -- g Acceleration of gravity ft/s2 (m/s2) L/T2 K3 Factor for mode of sediment transport -- -- K4 Factor for armoring by bed material -- -- Ks Pier shape factor -- -- K Discharge approach angle correction -- -- Kw Wide pier correction factor -- -- q Average discharge intensity upstream from ft3/s (m3/s) L3/s the bridge q2 Local discharge intensity in contracted channel ft3/s (m3/s) L3/s R Hydraulic radius ft (m) L Ss Specific gravity of bed sediment -- -- t Time s, h, day T te Time to "end" scour Kothyari et al. (2007) s, h, day T u* Shear velocity in the upstream section ft/s (m/s) L/T u*c Sediment critical shear velocity ft/s (m/s) L/T V1 Average velocity at upstream main channel ft/s (m/s) L/T Vc Sediment critical velocity for D50 ft/s (m/s) L/T Vc84 Sediment critical velocity for D84 ft/s (m/s) L/T Vlp1 Velocity used in computing "live-bed peak velocity" ft/s (m/s) L/T Vlp2 Velocity used in computing "live-bed peak velocity" ft/s (m/s) L/T y1 Average depth in the upstream main channel ft (m) L yr Regime depth ft (m) L ys Equilibrium scour depth ft (m) L yst Time dependent scour depth ft (m) L Flow skew angle radians Plane Angle Kinematic viscosity ft2/s (m2/s) L2/T

OCR for page 54
54 Symbol Description Units Dimensions Density of water slugs/ft3 (kg/m3) FT2/L4 s Density of sediment slugs/ft3 (kg/m3) FT2/L4 g Geometric standard deviation of particle size ­ -- distribution 1 Grain roughness component of bed shear stress lbf/ft2 (kPa) F/L2 c Critical shear stress at threshold of motion lbf/ft2 (kPa) F/L2 Angle of repose of bed sediment radians Plane Angle