Symbol 



Definition 



Dimension 



Example Units 



Metric 



English 



AV 



D=0 



50 



Weight (or mass) of individual 

 armor units in primary cover 

 layer; weight (or mass) of indi- 

 vidual units, any layer 



• Fetch width of channel or other 

 restricted body of water (Ch. 3) 



9Windspeed 



• Maximum sustained windspeed 

 (Ch. 3) 



• Parameter used in pile force 

 and moment calculations 



(eq. 7-Al) 



• Length of vertical wall af- 

 fected by unit width of wave 

 crest (W = 1/sin a) 



• Width of surf zone (eq. 4-51) 



Weight of individual armor unit 



Weight of available quarrystone 



Zero-damage quarrystone weight 



Windspeed coefficient (eq. 7-12) 



Heaviest stone in the gradation 

 of a layer of riprap (eq. 7-124) 



Weight of primary cover layer 

 made of rock 



X component of windspeed 

 (eq. 3-77) 



y component of windspeed 

 (eq. 3-78) 



Weight of 50 percent size of 

 armor riprap gradation 

 (eq. 7-117) 



Unit weight (or mass density) 



• Vertical (z) component of local 

 fluid velocity or current 

 velocity 



Unit weight (or mass density) 

 of armor (rock or concrete) 

 unit (saturated surface dry) 

 (eq. 7-116) 



Unit weight (or mass density) 

 of water 



Coordinate axis in direction of 

 wave propagation relative to 

 wave crest 



• Coordinate axis along basin 

 major axis 



• Coordinate axis perpendicular 

 to and positive toward shore 



• A distance 



Subscript for x-coordinate 



L 

 L/T 



L/T 



L/T 

 L/T 



F/L, (or 

 M/L-") 



L/T 



F/L" (or 



m/l"*) 



F/L:f (or 



m/l-^) 



km 

 m/s 



m/s 



N 



m/s 



m/s 



N 



N/m (or kg/m ) 



m/s 



N/m (or kg/m ) 



3 3 

 N/m (or kg/m ) 



lb 



nmi, mi 

 knots, mi/hr 



knots, mi/hr 



ft 

 ft 



lb 



lb 



lb 



lb 



lb 



knots, mi/hr 



knots, mi/hr 



lb 

 Ib/ft^ 



knots, mi/hr 



Ib/ft^ 

 Ib/ft^ 



ft 



(Continued) 



Note: the SI unit of weight (meaning force, or mass accelerated at the standard free-fall 



2 

 is the newton, which is equal to 1 kg-m/s . When computing armor unit weights for practic. 



can be converted to kilograms (mass) by multiplying by 9.80665. 



rate of 9.80665 m/s ) 

 il purposes, newtons 



B17 



