d. Considers the influence of a large number of variables on wave 

 transmission. 



e. Is simple and easy to use and does not require a large computer. 



f. Is consistent with the physics of wave transmission as currently 

 understood. 



One disadvantage of the model is that it was developed for breakwaters without 

 a traditional multilayer cross section; therefore, the model would probably 

 tend to overpredict the amount of energy transmitted through a traditional 

 rubble-mound structure. Another disadvantage is that the model was not spe- 

 cifically designed to provide guidelines for rehabilitation. Despite these 

 limitations, the model provides a good starting point approach for a REMR 

 model and can demonstrate the potential that a model based on laboratory tests 

 can have in indicating the extent to which repairs or rehabilitation will 

 reduce wave transmission over and through a rubble structure. 



7. To use the reef breakwater transmission model to predict either the 

 transmission coefficient or the transmitted wave height, the following infor- 

 mation is required: the incident zero-moment wave height H *; the period 

 n mo 



of peak energy density of the incident wave spectrum T ; the crest height of 



the reef h : the water depth the reef is sited in d ; the cross-sectional 

 c v s 



area of the reef breakwater A ; the median stone weight used in the reef 

 breakwater, W ; and the unit weight of the stone w (Figure 1). Since 

 all of this information is required it means that the influence of all of 



TRANSMISSION 

 BY OVER TOPPING 



7^7^ 



^T^TK 



TRANSMISSION 

 THROUGH REEF 



Figure 1. Definition sketch for wave transmission 

 over and through a reef breakwater 



* For convenience, symbols and abbreviations are listed in the Notation 

 (Appendix A) . 



