Comparison of the upper and lower parts of Figure 13 suggests that the 

 structure tested by Lamarre (1967) with a smaller relative crest width has 

 slightly higher wave transmission coefficients than found for BWl . 



Results from laboratory tests by Goda (1969) for breakwaters with vertical 

 faces (Fig. 14) have the same trends as observed for breakwaters with 1 on 1.5 

 slopes . 



.0 



n — r 



-I I I I I I I 1 I I I I I I r 

 Godo ( 1969) 

 0.0047<()/gT2<0.027 

 B/h ~ 0.86 



B 



J I i__l I L 



1 — I — I — I — \ — I — i— I — I — I — I — I — I — I — I — I — r 



Godo (1969) 

 d/gT2 : 0.016 

 B/lis~ 0.0 



0.8 



0.6 - 



0.4 - 



0.2 - 



= 0.51 



SWL- 



B Si 0.0 



i 



J I I I I I I I I I ■ I ■ 



J L 



-1.0 -0.8 



-0.6 



-0.4 -0.2 



0.2 



0.4 



0,6 



0.8 



Figure 14. Wave transmission coefficients for vertical, smooth 

 impermeable breakwaters using Goda's (1969) data. 



The recommended formula for predicting the wave transmission by overtopping 

 coefficient for the range 0.006 1 d/gT^ 1 0.03 is 



^To 



(-0 



(14) 



30 



