This wavelength is measured perpendicular to the wave crests. To obtain the 

 wavelength along the structure, this value must be divided by cos a. Thus, 



L' = 



175 



cos a cos 30 



^ = 203 feet (61.9 meters) 



where L' is the wavelength along the structure. The appropriate wave 



Figure 2.9 by interpolating between the pro- 

 le^ = 1 - 10"^. This profile is plotted in 

 Figure 5 in dimensionless form. 



profile is obtained from SPM 

 files for k^ = 1 - 10"^ and 



1.0 



0.8 



'T] 0.6 



0.4 



0.2 























\ 





















\ 



1 



^ 





















\ 





















\ 



\ 



^ 



--SWL 

















- 



-^ 



_/ 















0.1 



0.2 



x/L 



0.3 



0.4 



0.5 



Figure 5. Dimensionless cnoidal wave 



profile, k 



2 _ 



1 - 10 



-4.5 



The distribution of force along the structure is then obtained by letting 

 the maximum correspond to 7,300 pounds per foot and the minimum to 2,400 

 pounds per foot. Then F^ " Ft " 7,300 - 2,400 = 4,900 pounds per foot or 

 71,500 newtons per meter and 



F(x) = 2,400 + 4,900 n(x) 



where F(x) is the variation of force with distance along the structure, 

 and ri(x) is the variation of the dimensionless surface profile with x. 

 Similarly, the distribution of the overturning moment along the structure 

 can be determined. M^ - Mj. = 41,000 - 7,000 = 34,000 foot-pounds per foot or 

 151,200 newton meters per meter and therefore. 



M(x) = 7,000 + 34,000 n(x) 



13 



