Evaluation of Bridge-Scour Research: Abutment and Contraction Scour Processes and Prediction (2011)

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Reference Notes Formula −0 19 Dey and Clear-Water Scour (0.9<V1/Vc<1.0) 1 26  B1  d  ds F1e = (V1 – V1c)/[(SG – 1)gY1]1/2 ; SG = specific  = 0.368F10 55  50  B   e Raikar  2  Y1  Y1 gravity; V1c = approach flow velocity when V2 = (2005) Vc at beginning of scour HEC-18 Live-Bed formula is the same as Laursen (1960) 6/7 p Y2  Q2   B1  =   with the ratio of Manning’s n removed; p = Y1  Q1  B  Richardson   2  Live-Bed sediment transport factor = 0.637-0.857. and Davis (2001) Clear-Water formula is derived from Y2 = q2/Vc and it is different in form, but not in 3/ 7  K Q2  principle, from Laursen (1963) because it does Y2 =  2 u 3 2 2  / not involve the approach flow section.  d m B2  Clear-Water Ku = 0.025 (SI); 0.0077 (EN); dm = 1.25 d50 86