as 
20 
PSF 
aan aPa aa aerate tate ate nate| 
ul 
S 
© Sg 
5 BY mm 6 
8 Be ; 
uo ie me = 4 Z 
& SY Sg & 4 as 
= ke y by y % 4 y) 
8 SZ Sg = 4 is 
va WW kd Ve A Y y yj 
a ee Ve Vee Y 
a | es ee ee 
ra ee ee aes Cae A 
ag eed Ves Ve 
8 ed es es so 
res) ee ee es a A RS ie op 
5 B eet Ves (ae Ve ee es ee 7) 
' 3 es es es es es es y 3 
Ry ee es es) es 
S Ve Ce eS eS es es es es 
Se ees es ee ae ae es es 
Bm es ees es es ae ee ee ee 
2 pS B es es Ss ee ee ee 
5 SMG SA SBA A I IS 20S 30 ee 3 i =: 
ie 3, O- 4.0- 5.0- 6.0- 7.0- 8.0- 9.0- 10.0- 11.0- 12.0- 14.0- 17.0- 
‘399 “59 “4.9 5.9 6.9 7-9 8.9 9.9 10.9 li.9 13.9 16.9 LONGER 
PERIOD, SEC 
Figure 10. Annual wave period distributions for 1982 
or longer periods than did gage 625. The higher precentage of short period 
waves at gage 620 is believed to result, in part, from the differences in 
fetch for winds blowing from the west. The fetch at gage 625 is only about 
0.5 km, while that at gage 620 is about 3 km, sufficiently long to allow some 
wave growth. 
77. The distribution of wave directions for the year (Figure 11) re- 
vealed that waves approached from the south side of the pier (i.e., from 
>70 deg) 20 percent more frequently than from the north side. However, for 
storm wave conditions, the distribution was three-to-two favoring waves ap- 
proaching from the north side. 
78. Temporal variation. The monthly and seasonal variations in wave 
characteristics were consistent with the wind variations (see paragraph 65). 
Temporal trends for gages 625 and 620 are shown in Figures 12 and 13, respec- 
tively, and are consistent with those for gage 615. Seasonal wave height 
distribution variations (Figure 14) were similar for all gages. Waves were 
highest between October and December 1982 when they could be expected to 
exceed 2 m 15 percent of the time (twice as often as between January and 
March). Wave heights were at a minimum between July and September, exceeding 
2m on only four occasions. 
42 
