Z10 



6 - 



I I I I 1 — I — I I I M — r 



-T— 1 — I I I I I — I I I I I 1 1 — I — I I I I 



-^4.0 



I I I I I I I III 



1 I I I I r I I I I I 



-2.5; 



2.0 



1.5 



50 



100 

 Return Period (yr) 



500 



Figure 27. 



Tide frequencies at Wright Monument, North Carolina, 

 for the following classes of storms: (a) landf ailing, 

 (b) alongshore, (c) inland, (d) exiting hurricanes and 

 tropical storms, (e) winter storms, (f) all storms 

 (from Ho and Tracey, 1975). 



Hicks (1981) examined the recent rate of sea level rise for a number 

 of east, gulf, and west coast beaches. For the closest station to the FRF, 

 Hampton Roads, Virginia (near the mouth of the Chesapeake Bay), Hicks calcu- 

 lated a rate of sea level rise equal to 0.4411 centimeter (0.0144 foot) per 

 year based on the period 1928 to 1978. 



7. Surface Water Temperatures. 



Table 9 gives monthly mean surface water temperatures at Virginia Beach 

 based on observations between 1960 and 1966 (Department of Commerce, 1968). 



Table 9. Monthly 



mean surface water temperatures. ^ 



Month 



°C. 



°F. 



Month 



°C. 



°F. 



January 



5.7 



42 



July 



22.7 



73 



February 



4.4 



40 



August 



23.9 



75 



March 



6.4 



44 



September 



22.5 



72 



April 



10.7 



51 



October 



18.1 



65 



May 



16.1 



61 



November 



14.1 



57 



June 



20.3 



69 



December 



8.4 



47 



'■ Annual 



14.4 °C. (58°F.). 



53 



