F = slope friction constant 

 s 



g = acceleration due to gravity 



h = water depth along sloping breakwater face 



h = constant water depth seaward of breakwater 



H. = incident wave height 



H = maximum wave height 

 max 



H . = minimum wave height 

 mm 



Ah. = horizontal slice thickness 

 ] 



AH = head difference for equivalent breakwater 

 e 



AH = head loss in material n 

 n 



AIL = head difference for trapezoidal breakwater 



k = wave number 



k = wave number corresponding to constant depth region 



k. = imaginary part of wave number 



k = real part of wave number 

 r ^ 



K = momentum coefficient 



m 



Si = length of crib-style breakwater 



a = equivalent length of crib-style breakwater 



a = length of porous material n 



a = submerged horizontal length of impermeable slope 



L = wavelength 



L = distance parameter used in permeameter tests 



M„ = momentum flux 

 r 



n = porosity 



