(2) Frequency Analysis. 



(a) Wind Data. 



Wind roses for for the Delaware Bay area are 

 Army Engineer District, Philadelphia, 1970). 



given in Figure 8-12 (U.S 

 Assume that sizeable waves occur primarily when wind is blowing along central 

 radial from the NW. This is the predominant wind direction for the Delaware 

 Bay area. Wind is from the NW approximately 16 percent of the time. 



The maximum observed wind in 18 years of record was 113-k.m/hr (70-mph) 

 gale from the NW (daily maximum 5-minute windspeed). 



(b) Thomas Fastest-Mile Wind Frequency . In the absence of 

 tabulated wind data (other than that given on the following page), the 

 windspeed frequencies of Thom (1960), adjusted for wind direction, will be 

 used. Thorn's windspeed are multiplied by 0.16 to adjust for direction. This 

 assumes that winds from the NW are distributed the same as are winds when all 

 directions are considered. 



Adjusted for direction (column 2 divided by 0.16). 



Extreme fastest-mile windspeed. 



Extreme fastest-km wind = 1.6093 x U fastest-mile windspeed. 



8-21 



