. Coastal scour problems and methods for prediction of maximum scour. Scour (Hydraulic engineering); Sea-walls; Underwater pipelines; Rubble mound breakwaters. 4>s = angle of repose for a given sediment grain, degrees 7 = specific weight of fluid, lbf/ft3 7S = specific weight of sediment, lbf/ft3 Vs = volume of a sediment grain, ft3 As = projected area of a sediment grain, ft2 A0 = orbital diameter of wave motion, ft w = terminal fall velocity of sediment, ft/sec u* = shear velocity = (r/p)1/2, ft/sec Ujj,.^ = near bottom maximum horizontal orbital velocity, ft/sec ps = sediment density, lb
. Coastal scour problems and methods for prediction of maximum scour. Scour (Hydraulic engineering); Sea-walls; Underwater pipelines; Rubble mound breakwaters. 4>s = angle of repose for a given sediment grain, degrees 7 = specific weight of fluid, lbf/ft3 7S = specific weight of sediment, lbf/ft3 Vs = volume of a sediment grain, ft3 As = projected area of a sediment grain, ft2 A0 = orbital diameter of wave motion, ft w = terminal fall velocity of sediment, ft/sec u* = shear velocity = (r/p)1/2, ft/sec Ujj,.^ = near bottom maximum horizontal orbital velocity, ft/sec ps = sediment density, lbm/ft3 p = fluid density, lbm/ft3 g = acceleration due to gravity, ft/sec2 The relationships of Komar and Miller are shown graphically in Figure 3 below. Their findings, based solely on laboratory data, essentially state that the threshold of sediment movement for median grain diameter d and density ps can be specified by a wave period and a near-bed orbital velocity (u^^) . Use of the Komar and Miller relationships should be tempered by the lack of prototype data used to verify Particle diameter, in Figure 3. Komar and Miller (1974) plots of near-bottom orbital velocity for threshold of sediment movement under oscillatory waves (extracted from Hales (1980)) 13. 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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