w 



LEGEND 

 WAVE HEIGHT 



SOVER 2.99 M 

 2.50-2.99 M 



2.00-2.49 M 



1.50-1.99 M 



I 



i 



II! 



A PERCENT OF WAVES 

 OCCURRING FROM 

 THIS DIRECTION FOR 

 THE 20 YEARS 



A 



STATION 81 



JAN-DEC 

 58440 CASES 



Figure 19. Wave rose diagram showing the significant wave height 

 and direction of wave propagation for combined 20-year hindcast 

 data in a 10-m water depth at station 81 off Kitty Hawk, N. C. 

 (from Jensen 1983) 



Coastal Storms 



47. Extratropical (northeasters) and tropical (hurricanes) storms play 

 a major role in changing the position of the shoreline. Figure 20 from Eber- 

 sole (1982) shows the frequency of occurrence of storm surge for extratropical 

 storms at Hampton Roads, Virginia, the closest tidal reference station to the 

 study area (about 20 km west of Cape Henry). The figure was produced using 

 hourly values of water level data from 1952 to 1971. Ebersole (1982) found 

 that about 20 years of data provided a relatively stationary tidal probability 



36 



