Symbol Definition 



t' Time required to reduce wave height 



50 percent by internal friction 



U Cross-sectional area tidal velocity 



(Section III) 



•Total uplift force on parapet due to 

 waves (Fig. 6-38) 



U' Dimensionless velocity in x direction 



defined as u/(gd J^'^ 



u Velocity in x direction 



u- Velocity of wave particle at nozzle mouth 



(Eq 6-34) 



u^jV- Velocity components on the shoreline 



(Eq 2-66, 2-93) 



u Shear velocity (Section V only) 



* 



V Velocity 



•Velocity of wave propagation (phase 

 velocity) (Eq 4-10 through 4-1 7b; Fig. 

 4-1; Eq 6-24 through 6-26, 6-35, and 6-36) 



V' Dimensionless velocity in y direction, 



defined as \l(gd^)^l^ 



V Volume 



(V . ) Initial volume of air in pneumatic chamber, 



° per foot of chamber 



Vj Total volume 



V Volume of voids 



V Velocity of water impinging on breakwater 

 slope 



V Volume of water displaced per foot length 

 of generator in T/2 sec 



AV Volume of water leaking around ends and 



bottom of wave generator per foot length 

 of generator in T/2 sec 

 V Velocity in y direction 



W Weight 



W Weight of individual armor units 



_a " 



W Total weight of armor units in a cover 



layer of thickness t for a given surface area 



W Weber number 



n 



W Weight of parapet (Eq 643) 



w Velocity in z direction 



•Settling velocity (Section V only) 



X Dimensionless length in x direction, 



defined as x/L 



Dimension 



Unit 



T 



sec 



L/T 



ft/sec 



F 



lb 



L/T 



L/T 



L/T 



L7L 



ft/sec 

 ft/sec 



ft /sec 



L/T 



ft/sec 



L/T 



ft /sec 



L/T 



ft/sec 



ft^ 



ft^/ft length 



L/T 



ft/sec 



L^/T/L 



ft^ /sec/ft of 





generator 



L^/T/L 



ft^ /sec/ft of 





generator 



L/T 



ft/sec 



F 



lb 



F 



lb 



F 



lb 



F 



lb 



L/T 



ft/sec 



L/T 



ft/sec 



527 



