Symbol Definition 



D Sediment particle size 



DjQ 50-percent-finer-than particle diameter 



D» Dimensionless sediment size (Section V 



only) 



d Depth 



d, Distance from stiUwater level to crest of 



rubble-mound base of composite break- 

 water (Fig. 6-3) 



E Energy 



•Modulus of elasticity 



•Dispersion coefficient (Section III only) 



E Dispersion coefficient in salinity intrusion 



region 



E, Modulus of elasticity of breakwater material 



E! Bulk modulus of elasticity of breakwater 



material 



E, Longitudinal dispersion coefficient in 



uniform density fluid 



Ej. Modulus of elasticity of nylon 



E Euler number - - 



n 



E^ Modulusof elasticity of water F/L^ lb/ft 



e Base of natural logarithms (2.71828) 



F Force F lb 



•Reads "function of" - - 



- •Froude number (Section V only) 



•Total horizontal wave force on vertical- F lb 



wall parapet (Fig. 6-38; Eq 6-43) 



Fg Elastic compression force F lb 



F^ Friction force between base of parapet and F 



Dimension 



Unit 



L 



ft; mm 



L 



ft; mm 



L 



ft 



L 



ft 



LF 



ft-lb 



F/L^ 



Ib/ft^ 



L^/T 



ft^/sec 



L^/T 



ft^/sec 



F/l2 



lb/ft2 



F/L^ 



Ib/ft^ 



L^/T 



ft^/sec 



F/l2 



Ib/ft^ 



lb 



crest of rubble-mound breakwater 



F Gravity force F lb 



F. Inertia force F lb 



F^ Froude number 



F Pressure force F lb 



pr 



F . Surface tension force F lb 



st 



F Viscous force F lb 



F* Densimetric Froude number ~ - 



•Boundary layer densimetric Froude 

 number (Section V only) 



f Friction factor ~ - 



522 



