are shown in Figure 4. Sample horizontal length calculations are also 

 included. Note that when determining horizontal lengths of the armor 

 material, the outer layer of the armor on the seaward side of the break- 

 water should be "removed" first because dissipation of the seaward face 

 is determined in a separate part of the computer program. 



Table 4 gives the computer program input information required for the 

 example; Table 5 is the resulting program output. The output shows that 

 predicted transmitted wave height for this example is a complex function 

 of incident wave height and period. 



Table 4. Sample input. 



OOOnoOVS 2.S2 0,66T 0.692 O.SO" 



3.60 6.U0 

 2^S^ 0.0 

 0.0 0.0 



1 



EX4HP1 E 



PROBLEM 







18 1 J 



6.fi 



a 



5 



WAT 1 



0.72<J 







37 



MAT ^ 



C^'^S 



C 



37 



MAT i 



co^a 







37 



LAY 1 



3.5S 



IX 



53 



LAY ? 



e.7s 



u 



53 



LAY 5 



n , u7 



5 



25 



5.0 



0.1 







^J.O 



0.5 







5.0 



l.U 







5.0 



1.5 







5.0 



1.75 







5.6 



?.o 







10,0 



0.1 







10,0 



0.5 







10,0 



1.0 







10,0 



1 .5 







in.O 



I. 7-5 







10. 



?.o 







20.0 



0.1 







^0,0 



0.5 







20.0 



1.0 







20.0 



'. .5 







20,0 



1.7S 







20.0 



2.0 







V. SUf/fflARY 



A computer program is presented for estimation of wave transmission 

 coefficients for permeable breakwaters. Extensive testing of the program 

 with laboratory data has shown that the program can be used to estimate 

 transmission coefficients for monochromatic or irregular waves and for 

 rubble-mound or other types of permeable breakwaters. A limited amount 

 of testing suggests that it can also be used for breaking and nonbreaking 

 waves . 



A copy of the card deck and more extensive program documentation for 

 the computer program flADSEN (CERC Program Number 752X6R1CPO) are avail- 

 able from the ADP Coordinator at CERC. The cost of running the program 

 on a CDC 6600 computer is only a few cents for each wave condition of 

 interest . 



14 



