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<br />The following equation suggested by Neill (16) for determining <br />the velocity associated with initiation of notion is an indicator <br />for clear-water or live-bed scour. <br /> <br />Vc = 1. 58 [(Ss -1) gDSO] 1/2 (y/DSO) 1/6 <br /> <br />Where: <br /> <br />= critical velocity above which bed <br />materials of size Dso and smaller <br />will be transported. <br /> <br />Vc <br /> <br />Ss = specific gravity of bed materials, <br />y = depth of flow <br /> <br />'" <br />>> <br /> <br />/ MAXIMUM SCOUR DEPTH <br />~ _ _~ EQUILIBRIUM SCOUR DEPTH <br /> <br />~ <br /> <br /> <br />~ <br />:r: <br />l- <br />e. <br />w <br />o <br />0:: <br />::J <br />o <br />U <br />(j) <br /> <br />~L1VE BED SCOUR <br /> <br />CLEAR-WATER SCOUR <br /> <br />TIME <br /> <br />Figure 2.2 Scour Depth as a Function of Time <br /> <br />19 <br />