line 10 of Ludlam Island (finest) and profile line 12 of Long Beach Island 

 (coarsest). Variations with time at a profile line and with position 

 across a profile are nearly as great as between profiles (Tables 2 and 3). 



d. Sand size tends to decrease southward from Island Beach to Townsends 

 Inlet in southern New Jersey. Evidence from sample set B suggests that 

 there is a discontinuity in size at Little Egg Inlet between Long Beach 

 Island and Brigantine. McMaster (1954) found a discontinuity in heavy 

 mineral occurrence across Little Egg Inlet, along with a relatively rapid 

 southward decrease in sand size. 



e. Sand size tends to get finer landward across profiles on Atlantic 

 City and Ludlam Island, but it tends to get coarser landward across the 

 profiles on Long Beach Island and Island Beach. Both sample averages 

 (Fig. 16) and profile averages (Fig. 17) show this same trend, although 

 sample averages show a somewhat smoother variation, and sample set B shows 

 less pronounced trends at Atlantic City and Ludlam Island. 



f. For the data of sample set A, monthly variation of sand size at 

 the three localities studied does not suggest an annual cycle in the 9 

 months sampled between January 1968 and March 1969, inclusive (Fig. 18). 

 However, monthly variation in sample set B suggests that sand size is 

 finer during late summer and early fall on these beaches (Fig. 21), although 

 a pronounced annual cycle is not evident. 



g. Sample set A data suggest that size variation at Atlantic City is 

 positively correlated with variation at Ludlam Island and negatively cor- 

 related with variation at Long Beach Island (Fig. 20). These correlations 

 are found for size variation with both position on the profile (Fig. 16) 

 and month (Fig. 18). 



■2 . Coastal Engineering Applications . 



a. The data in this report have a site specific use for coastal engi- 

 neering design in the localities sampled. These data supplement information 

 given in Table C-2 of U.S. Army Engineer District, Philadelphia (1974) and 

 related studies. Such size data can be used, for example, with dimension- 

 less falltime parameters to predict profile shape (U.S. Army, Corps of 

 Engineers, Coastal Engineering Research Center, 1975, p. 4-81). 



b. The size variation along and across the beaches, and with the 

 month affects planning for beach fills on these shores. For example. 

 Figure 16 indicates that size differences in the surf zone between local- 

 ities are less than size differences on the berm between the same local- 

 ities. This suggests that one size class of sand will be preferentially 

 sorted toward the surf zone. Thus, finer-than-native sand may provide 

 more protection than expected as a berm on beaches such as Atlantic City 

 and Ludlam Island, but not on Long Beach Island. These size differences 

 also suggest that greater longshore dispersion of beach fills will be 

 obtained from sand whose size matches the surf zone samples rather than 

 the berm samples. 



51 



