

0.9 



(0 



a 



0.8 



t 



ljj 



Q 



0.7 

 0.6 



a: 



LU 



m 



0.5 



LU 



> 



0.4 



5 



LU 



0.3 



LL 



0.2 





0.1 



TOE BERM ARMOR STABILITY 



ALL TESTS 



y~ ^. ^ Ns = 3.5 

 Y ^ Ns = 3.0 



Ns = 4.0 



Ns = 2.5 



Ns = 2.0 



0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.11 0.12 0.13 0.14 

 RELATIVE TOE DEPTH, ds/Ls 

 Figure 13. Contours of equal stability number for the 

 ranges of relative berm depth and relative water depth 

 at toe which produced design data for toe berms 



NS 3 VS dl/ds 



ALL TESTS 



LEGEND 



2-D TESTS', 5- 



6.75-FT FLUMES 



Figure 

 for 



■ 90 DEGREE WAVES ON TRUNKS 

 3-D TESTS; L-SHAPED WAVE BASIN 

 + OBLIQUE WAVES ON TRUNKS 

 o 90 DEGREE WAVES ON TRUNKS 

 A OBLIQUE WAVES ON HEADS 

 x 90 DEGREE WAVES ON HEADS 

 -D TESTS; T-SHAPED WAVE BASIN 



0.3 0.5 0.7 0.9 



RELATIVE BERM DEPTH, dl/ds 



14. Stability number cubed versus relative berm depth 

 all toe berm stone tests which produced design data 



25 



