g. Peak spectral wave period distributions . For each gage, T 



distributions are presented as annual and seasonal histograms 

 for 1981 and for 1980 plus 1981 and monthly histograms for 1981 

 alone are presented (Figures B7, B8, B9 , B20, B21, B28, B29 , 

 B36, and B37). 



h. Persistence of wave heights. Tables B8, B9 , B17, B18, B26, B27 , 

 B35, and B36 show the number of times throughout 1981 and 1980 

 plus 1981 that the specified wave height was equaled or exceeded 

 at least once during each day of the duration (consecutive days) 

 indicated. For example, for gage 625 (pier-end Baylor), wave 

 heights equaled or exceeded 0.5 m 26 times for at least 1 day, 

 25 times for at least 2 days, 20 times for at least 3 days, 

 17 times for at least 4 days, etc. Therefore, on one occasion 

 one would expect the height to have equaled or exceeded 0.5 m 

 for 1 day exactly, on five occasions for 2 days, on three 

 occasions for 3 days, on two occasions for 4 days, etc. Note 

 that the height exceeded 1 m 41 times for 1 day or longer, while 

 heights exceeded 0.5 m only 26 times for this same duration. 

 This occurred because the longer durations of lower waves may 

 be interspersed with shorter, but more frequent, intervals of 

 higher waves. For example, the one time that wave heights 

 exceeded 0.5 m for 55 days may represent four or five times 

 that the height exceeded 1 m. 



i. Wave roses . Wave roses showing the distribution of wave approach 

 angles for gage 625 (pier-end Baylor) are presented for each 

 month of 1981 and annually, seasonally, and monthly for 1980 

 plus 1981 (Figures BIO, Bll, and B12) . The angles shown are 

 referenced to true North. The FRF pier axis is oriented 

 69°58' east of true North. Northerly wave angles (e.g., those 

 of less than of 70 deg) generally produce southward currents, 

 while southerly wave angles, which are greater than 70 deg, pro- 

 duce northward currents. 



2. Spectra. Sample spectra for gage 625 (pier-end Baylor) for 



days when wave heights exceeded 2 m at gage 625 are presented in 

 Figure B13. The plots show energy density as a function of wave 

 frequency every 6 hr througout the day. 



B2 



