x 100 
Percentage of wave duration 
Length (observed) 
Length (calculated 
25) 
110 
90 
60 
70 
‘0 
Ol 00501 02 05 | 2 5 10 20 30 40 50 60 70 80 
Average of all observations = 49. 3 %— —,-— — 
NANTUCKET LIGHTSHIP 
Percent Less Than 
90 95 98 99) 99.8 
FIG.5. RELATION BETWEEN OBSERVED AND CALCULATED WAVE LENGTH AND FREQUENCY 
NANTUCKET LIGHTSHIP 
Legend 
Swell 
Observed 
———— Wind Waves 
Hindcast —o— = 
N NE E SE Ss SW 
WwW NW 
FIG.6. WAVE DIRECTION FREQUENCY 
Il 
