7.0 
HEIGHT (METERS) 
0 
1 10° 10° 
PERCENT GREATER THAN INDICATED 
Figure 18. Wave height distributions for 
1980 through 1982 
10° 
85. The addition of one year of 1982 data to the 1980 and 1981 data set 
did not noticeably change the annual wave height distribution (Figure 19) nor 
the spring, fall, and winter data. The July to September distribution was 
lowered by only 0.1 to 0.2 percent. 
86. Distribution of wave periods for the combined data set was similar 
for all gages (Figure 20) with most periods being between 5 and 12 sec. As 
with the height distribution, the addition of data for 1982 had little effect 
on the wave period distribution. Table 12 presents the joint distribution of 
wave heights and periods for gages 625 and 620 for the combined 1980-1982 
data. For storm conditions when An exceeded 2 m, there was a range of 
periods from 6 to 17 sec, although as the heights increased the periods tended 
to increase also. 
87. Wave direction of approach for the combined data (Figure 21) was 
approximately evenly split between directions north and south of the pier 
axis. However, storm waves approached twice as frequently from the north than 
from the south. 
88. Summary statistics have been presented which show that wave condi- 
tions at the FRF have a spatial and temporal variation. The cold months of 
51 
