Combining Individual Scour Components to Determine Total Scour (2018) / Chapter Skim
Currently Skimming:
Pages 249-251
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 249... ...
249 8. LIST OF SYMBOLS AND ABBREVIATIONS SYMBOLS a = pier width; a*
|
From page 250... ...
250 Lb = width of bridge deck in flow direction; M = discharge contraction ratio; mA and mB = values of qmax/q2 for scour conditions A and B, respectively; n = Manning's flow resistance factor; Qot = bridge overtopping discharge; Qc = approach flow rate in main channel; Qt = total flow rate in main channel in bridge section; Qunobst = flow rate in approach flow cross-section unobstructed by abutment and embankments; q1 = flow rate per unit width in the approach flow section; q2 = flow rate per unit width in the contracted section; qf1 = average flow rate per unit width in approach floodplain flow section; qf2 = average flow rate per unit width in bridge floodplain section; qmax = unit discharge coinciding with location of deepest scour; qm1 = mean unit discharge in approach flow main channel; qm2 = mean unit discharge in contracted flow in main channel; rT = scour amplification factor; SG = specific gravity of sediment; t = maximum vertical thickness of separation zone under bridge deck in submerged flow; u* = shear velocity; u*
|
From page 251... ...
251 Ym1 = initial flow depth in the approach flow main channel; Yf1 = initial approach flow depth on the floodplain; τ1 = bed shear stress in approach flow; τ2 = bed shear stress in bridge section; τf = shear stress of approach flow in floodplain; τc = critical shear stress for initiation of sediment motion; τ* c = Shields' parameter; σ = geometric standard deviation of sediment size distribution; ABBREVIATIONS BLA Bankline abutments cfs Cubic feet per second CS Cross Section CSU Colorado State University CWS Clear water scour D/S Downstream DNS Direct numerical simulation F Free flow GT Georgia Tech HEC Hydraulic engineering circular LBS Live-bed scour LES Large-eddy simulation LSA Long setback abutment LSM Level set method for computing position of water surface OT Overtopping flow SO Submerged orifice flow SSA Short setback abutment S & M Sheppard and Melville TKE Turbulent kinetic energy TW Tailwater U/S Upstream UoA University of Auckland VOF Volume of fluid method to find position of water surface
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.