TABLE lU - Breaker Position 



ITT' 



T2T 



T 



T37 



L 



Rjl.^ d^/H^C carves) d^H^ (calculated) 



(feet) (seconcfs) (feet) 



7 



9 



11 



251 0,032 

 Ul5 0,019 

 620 0.013 



1.25 

 1.3 



1.5 



1.25 

 1.25 

 1.25 



Column (l) Hq = 



Column (2) T 



Column (3) Lq 



Column (U) Hq/Lq = 



Goluriin (5) d^/Ho -^ 



(curve) 

 Column (6) d^^/Hp :; 



(calculated) 



deep water design wave height from synoptic charts 



wave period from synoptic charts 



wave period wave length from L^ - 5.12 T^ 



column (1) divided by column (2) 



These values are tabulated from the curve of 

 Figure 18 



The design depth at the stnacture divided by 

 column (1) = 10/8 = 1.25. 



266. For the 7-second period, the fact that columns {Si and (6) are 

 the same, indicates that a 7-second wave may break directly on the wall. 

 The values for the 9-second period are so close that breaking waves may 

 again be assumed. For these two periods, then, wave forces must be deter- 

 mined by Minikin's criteria. For the 11-second wave, column (5) is the 

 larger than column (6) indicating that waves would break seaward of the 

 wall, and the force criteria for broken waves apply. If column (6) had 

 been smaller than coluiTin (5) the Sainflou criteria would be used. 



267. Breaking Waves . - The curve, U.C., of Figure 17 may be used 

 to determine the breaking wave height H-j^. 



TABLE 15 - Breaking Wave Heights 



Period T 

 (seconds) 



7 



9 

 11 



o' c 



Hb/Ho 



0.032 

 0.019 

 0.013 



1,1 



1.25 

 I.I4 



9 

 10 



11 



H^ = the design wave height at the structure, 



132 



