Calculated shoal zone boi'nds for 20 U.S. sites using annual statistics of 

 LEO breaker observations; v' - 1.6, g - 32.2 feet per second squared, 

 D - 0.00033 foot (1 foot - . 305 me^e_r}^ 



Calculations for the 20 sites in Table 3 use annual suiimary statistics of 

 breaker observations collected under the LEO program conducted by the U.S. Army 

 Coastal Engineering Research Center (CERC) . Such wave data are liable to criti- 

 cism regarding precision and subjectivity, and seem to give larger annual mean 

 wave heights than gages located seaward of the littoral zone. Also, for the 

 Table 3 calculations, D has been set equal to 0.00033 foot (0.1 millimeter), 

 a typical value. However, the Table 3 results show consistency with Table 2 

 results for common regions. 



A * * * A ***** A * * A * EXAMPLE PROBLEM **************** 



GIVEN : At Galveston, Texas (29°17 ' N. , 94°47 ' W.), annual wave statistics for 

 1966 (Thompson, 1977) are: 



Mean significant height, Hg = 1.35 feet 



Standard deviation of height, a = 0.9 foot 



Mean wave period, Tg = 5.7 seconds. 



Median sediment diameter at the 18-foot water depth off Bolivar Peninsula just 

 north of Galveston (U.S. Army Engineer District, Galveston, 1958) is: 



D = 0.00033 foot (0.1 millimeter). 



14 



