The most probable maximum waves can be obtained by using 



Hn = 0-707 H^ ^ log^ - . 



(3-39) 



The most probable maximum wave is obtained by setting n = 1, and 

 using Equation 3-39 



Hj = 0.707(59.4) 



j 30? 



100.4 feet, say 100 feet. 



Assuming that the 100-foot wave occurred, then the most probable 

 second highest wave is obtained by setting n = 2, the third from n = 3, etc. 



Hj = 0.707(59.4) 



I 30F 

 •Jlogg — — = 94.1 feet, say 94 feet; 



H3 = 0.707(59.4) ./log 



i 



303 



-3 , v-,..^ \l^^i>e -^ = 90.2 feet, say 90 feet. 



The problem now is to determine the changes in the deepwater waves as 

 they cross the Continental Shelf, taking into account the combined effects 

 of bottom friction, refraction, the continued action of the wind, and the 

 forward speed of the hurricane. This requires numerical integration, using 

 Table 3-3, Figure 3-35, and refraction diagrams. It is also necessary to 

 obtain an effective fetch length, by use of 



Fe = 



H, 



0.0555 U, 



(3-40) 



where 



and 



F is the effective fetch in nautical miles, 



H^ is the deepwater significant wave height in feet, 



Uj^ is the maximum sustained wind speed in knots. 

 For this example, using Equation 3-40 



59.4 



Fe = 



0.0555(91.6) 



= (11.69) = 137 nautical miles. 



3-62 



