where 



n 



= E E h C3) 



i=l 



t = ! 



and 



= 5 E A i C4) 



n=l 



It is immaterial whether time is consistently taken as the date of the earlier 

 or the later of the two surveys compared. The standard deviation SD of 

 annual rates of shoreline change is 



rh E (s i • *> (5 > 



SD = 



i n - z 



V i=2 



where 



n 



S 



i=2 



Shoreline Change Rates 



Listing of shoreline change rates 



75. Shoreline changes, averaged (a) by varying shoreline distances 

 (b) over the total survey period and parts of that period, are presented 

 without interpretation in this section. Reasons for shoreline changes and 

 relationships between shoreline changes and shelf bathymetry, inlets, capes, 

 and shore orientation are discussed in the next section. 



76. Tables 5-8 are listings of shoreline change rates for the period of 

 approximately 1850 to 1980 for the following ocean shoreline reaches: 



Table 5: Virginia, west of Cape Henry 



58 



