0.14 



0.12 



0.10 



0.08 



0.06 



0.04 



0.02 



0.1 



0.2 



0.3 



0.4 



0.5 



SIN « 



0.6 



0.7 



0.8 



0.9 



1.0 



Figure 7-33. Variation of a with structure slope . 

 slopes only), based on this analysis is given by equation (7-13) 



a = 0.06 - 0.0143 Jin (sin G) 

 where is the structure slope angle from the horizontal. 



(7-13) 



The variation of Q between waves conforming to linear theory and to 

 cnoidal theory was also investigated by Weggel (1976). The findings of this 



* 



investigation are illustrated in Figure 7-34. Q is shown as a function of 



depth at the structure d , estimated deepwater wave height IT , and period 

 T , for both linear and cnoidal theory. 



Calculation of wave overtopping rates is illustrated by the following example. 



**************** EXAMPLE PROBLEM 7************** 



GIVEN: An impermeable structure with a smooth slope of 1 on 2.5 is subjected 

 to waves having a deepwater height H' = 1.5 m (4.9 ft) and a period T = 8 

 s . The depth at the structure toe is d = 3.0 m (9.8 ft) ; crest 

 elevation is 1.5 m (4.8 ft) above SWL. Onshore winds of 35 knots are 

 assumed. 



FIND: Estimate the overtopping rate for the given wave. 



7-54 



