where 



q = total volumetric sediment transport rate per unit width normal to 

 the current (vertically integrated combined bed and suspended 



3 

 sediment load (ft /sec/ft) 



p = porosity of sediment = 1 - a' 



D = sediment diameter which is exceeded in size by 65 percent (by 

 weight) of the total sample 



n = 1.0 - 0.2432 In Y (67) 



11/3 

 Y = D | ^^° ^ ^' (68) 



' " [^' 



s = specific gravity of sediment 

 V = kinematic viscosity of fluid 



C = exp [2.86 In Y - 0.4343 (In Y)^ - 8.1281 



(69) 



0.23 

 A = ^+0.14 (70) 



m^=^+1.34 (71) 



n _. 



v(!l) (/32 1ogiV)"' 



Lg(s - ddJ^^^ 



Equations 67, 69, 70, and 71 apply for 1 < Y < 60 (transition sediments). 

 For values of Y greater than 60 (coarse sediments) , C , i^i » ro, » and A 

 have the values of 0.025, 0, 1.5 and 0.17, respectively. 



69. Beyond the surf zone, both currents and nonbreaking waves exist. 

 So the Ackers and White formulation derived originally for currents only must 

 be modified for the presence of waves. The waves do not increase the level of 

 turbulence since turbulence is confined to a narrow boundary layer by the 

 oscillating wave orbital velocities. Since the shear velocity is dependent 

 upon the intensity of turbulence and thus the total energy degradation rather 

 than the net traction on individual sediment grains, the shear velocity is not 

 changed by wave action. With the wave-induced turbulence confined to a narrow 

 boundary layer and the waves propagating essentially without energy loss, the 



40 



