Table 6 

 Resultant Wave Height and Directions 



1985 



1980-1984 



1980-1985 



Month 



Jan-Dec 



Direction Direction Direction 



Height, m deg True N Height, m deg True N Height, m deg True N 



Annual 



0.7 



70 



0.8 



68 



0.8 



68 











Seasonal 









Jan- 



■Mar 



0.8 



66 



1.0 



63 



0.9 



64 



Apr- 



•Jun 



0.6 



79 



0.6 



78 



0.6 



78 



Jul- 



■Sep 



0.6 



73 



0.6 



72 



0.6 



72 



Oct- 



•Dec 



0.8 



65 



1.0 

 Monthly 



63 



0.9 



64 



Jan 





0.7 



58 



1.0 



55 



0.9 



56 



Feb 





0.8 



69 



1.0 



66 



1.0 



67 



Mar 





0.8 



71 



0.9 



67 



0.9 



67 



Apr 





0.7 



85 



0.7 



72 



0.7 



75 



May 





0.6 



76 



0.7 



78 



0.6 



78 



Jun 





0.4 



74 



0.6 



84 



0.5 



83 



Jul 





0.5 



79 



0.4 



80 



0.4 



80 



Aug 





0.7 



76 



0.6 



72 



0.6 



73 



Sep 





0.7 



66 



0.9 



68 



0.8 



68 



Oct 





0.9 



80 



1.1 



66 



1.0 



68 



Nov 





0.9 



68 



0.9 



60 



0.9 



61 



Dec 





0.6 



43 



0.9 



64 



0.8 



61 



shown in Figure 22. The histogram of seasonal wave period in Figure 24 shows 

 periods of 10 to 11.9 sec occurring most often and periods of 12 sec or longer 

 occurring most often during winter and autumn. 



56. The tendency for higher waves to be associated with longer wave 

 periods is shown in Table 7. These joint distributions of wave height and 

 period for Gages 630 and 625 are based on over 7,300 observations each. The 

 values presented can be converted to percent by dividing by 100. 



57. Annual and seasonal wave directions are shown in Figure 25. Waves 

 can be expected to approach from the north side of the pier 52 percent of the 

 time, within 1 deg of shore normal 8 percent, and from the south 40 percent. 

 However, when the wave heights exceed 2 m at Gage 625, 80 percent of the time 

 the approach will be from the north side, 7 percent shore normal, and 13 per- 

 cent from the south. 



41 



