. Coastal scour problems and methods for prediction of maximum scour. Scour (Hydraulic engineering); Sea-walls; Underwater pipelines; Rubble mound breakwaters. variables used in the method. Chao and Hennessy's method involves use of the following equations: uâ\H, 2Hâ - Rr for Hâ Z Râ (58) (H-RJ 2 (Hp/Rp)2 - (Hp/Rp) - 1 2 (HD/RD) 2 - 3 (HD/RD) + 1 for Hâ ;> Rr (59) T â ff P<"a ' K - Z (60) In the above, qs is the discharge through the scour hole in ft3/sec, and uavg is the average current velocity in the flow field. Figure 17 is a plot of the friction factor versus Reynolds number R
. Coastal scour problems and methods for prediction of maximum scour. Scour (Hydraulic engineering); Sea-walls; Underwater pipelines; Rubble mound breakwaters. variables used in the method. Chao and Hennessy's method involves use of the following equations: uâ\H, 2Hâ - Rr for Hâ Z Râ (58) (H-RJ 2 (Hp/Rp)2 - (Hp/Rp) - 1 2 (HD/RD) 2 - 3 (HD/RD) + 1 for Hâ ;> Rr (59) T â ff P<"a ' K - Z (60) In the above, qs is the discharge through the scour hole in ft3/sec, and uavg is the average current velocity in the flow field. Figure 17 is a plot of the friction factor versus Reynolds number R defined as shown in the figure, which allows determination of ff, the friction factor. In the figure, the roughness factor is defined as Roughness factor = âp- xl0~ dâ (61) with Rh the hydraulic radius, approximated by H^-Rp (see Figure 16) tnmx. mm e «.<â â»o 6 'M. -PRAKOTcs suoom-aouNOwr rojoton iW 4 6 8 10? 15 25 4 68(0*13 25 4 6 .R = U Ry Figure 17. Friction factor versus grain Reynolds number 46. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Fowler, Jimmy E; United States. Army. Corps of Engineers; Coastal Engineering Research Center (U. S. ); U. S. Army Engineer Waterways Experiment Station. [Vicksburg, Miss. : U. S. Army Engineer Waterways Experiment Station ; Springfield, Va. : Available from National Technical Information Service]
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