Figure A-3. Definition of terms for breaker 

 speed equation. 



where 



/gh 



h = H, + d, - a , 



b b t 



By dividing with H, , the wave speed becomes 



% - ^^ 



(A-23) 

 (A-24) 



(A-25) 



where K is a dimensional term depending on two ratios and g (see eq. 11 in 

 Galvin, 1969) 



K = /g(l + B - a) 



(A-26) 



The depth-to-height ratio, B, was assumed equivalent to the usual coastal 

 engineering rule-of-thumb (B = 1.28). The relative depression of the trough, 

 o, was known to vary from 0.15 to 0.40, and a standard value of 0.28 was used 

 for a giving a wave speed of (eq. 4) 



C = 8.02i/Hr (feet per second) 



It should be noted that there is recent evidence that both g and a 

 should have somewhat lower values than those used to obtain equation (4) but 

 the net result of the reductions does not significantly change the coefficient 

 in equation (4) . 



A third approximation is the replacement 



where the subscript b refers to breaker zone conditions. 



(A-27) 



