Embankment and Rubble Mound. 



Values of r 



for concrete armor units. 





Armor unit and 

 placement method 



Length dimension, 

 k 



V 



Armor -layer 



thickness 



(No. of units) 



Values 

 of r 



Slopes 

 (cot 6) 



Tetrapod 

 Random 



ryi 



2 



0.45 



1.3 to 3.0 



Uniform 



cQii 



2 



0.51 



1.3 to 3.0 



Quadripod 

 Random 









2 



0.51 



1.3 to 3.0 



t / 



Uniform 



irrc> 



2 



0.51 



1.3 to 3.0 



Tribar 

 Random 





\77) 



TT 



2 



0.45 



1.3 to 3.0 



Uniform 





\^6L 



11 



1 



0.50 



1.3 to 3.0 



Modified cube 

 Random 





2 



0.48 



1.3 to 3.0 



Uniform 





:x_/7 



1 



1 



0.62 



1.5 



Uniform 

 Uniform 





i — -\ 



1 



1 



1 



0.73 

 0.55 



2.0 

 3.0 







24 



