dg = 7.6m 
cot @=2.0 
Cor © = 50) —-S—= 
O 0.5 1.0 1.5 2.0 Cs) 3.0 S)9) 4.0 4.5 
Figure 12. Predicted wave reflection coefficients for smooth 
impermeable slopes with no overtopping. 
% 
+ 
+ 
a 
kk kK kk kk kk kk kk * XEXAMPLE PROBLEM 2% * * * * RK RR RK 
GIVEN: The wave conditions in example problem 1. 
FIND: The wave reflection coefficients if one layer (n = 1) or two layers 
(n = 2) of 4,500-kilogram (5 tons) rock at 2,700 kilograms per cubic meter 
(169 pounds per cubic foot) were added as armor to the revetment with coté@ = 
2 Og 
SOLUTION: The armor material in this example has 
Wy) ne 1/3 
¢ -(#) =| oan pian 
using equation (6). For the case of T = 10 seconds and H = 3.05 meters, 
equation (18) gives 
Hi: hog 
exp j-.7 2 coté —- 0.5 (5) 
1.3 
is 1.19 3.05 is 
exp [a1 ae OW) O55 as) = 0,556 
and from equation (16) 
fo) 
if 
(°] 
i] 
26 
