the mean trend for sample set B from Atlantic City and Ludlam Island is 

 toward coarser values on the seaward end. 



4. Monthly Variation . 



The size variation by month at Island Beach, Long Beach Island, Atlan- 

 tic City, and Ludlam Island is shown in Figure 23. Sample set B has data 

 for May, June, July, and August to help fill the gap in Figure 18 for sam- 

 ple set A. 



Although a clearly defined annual cycle in Figure 23 is not noticeable, 

 the data suggest that sand tends to get finer on the beaches in late summer 

 and fall. For the four localities (Fig. 23), the months with the finest 

 sand are: 



Island Beach October, December, and January 



Long Beach Island June, August, October, and November 



Atlantic City August, October, and December 



Ludlam Island June, August, October, and November 



For sample set A, which lacks data between March and October, the finest 

 sand occurred in October on two of the three beaches sampled. 



McMaster (1954] sampled in the summer and CERC mainly in the winter. 

 Since Figure 23 suggests that the summer usually has finer sand on the 

 beaches, this seasonal difference may account for some of the difference 

 between CERC's and McMaster' s data shown in Table 6. 



VI. CONCLUSIONS 



1. Sand Size . 



Conclusions from this study are based mainly on the data in sample set 

 A, supplemented where possible by sample set B. The basic data for these 

 conclusions are largely contained in the appendixes of Ramsey and Galvin 

 (1971), and summarized in Tables 1 to 6 and Figures 15 to 23 of this report. 



a. The crude sampling methods used to collect the samples give sur- 

 prisingly consistent results that show trends in location, position on 

 profile, and month of collection. 



b. The size analysis procedure used with the CERC RSA indicates sam- 

 ple means that are consistent among themselves. For sample set A, 30 RSA 

 means average about 0.33 phi units coarser than dry sieve means measured 

 from the same samples (eq. (2) and Fig. 14). (At the time of analysis of 

 sample set B, the RSA program had been modified, so sample set A was 

 modified by equation (2) and sample set B was not.) 



c. For sample set A, sand size, as given by sample averages at a pro- 

 file line, ranges from 0.20 to 0.34 millimeter (2.30 to 1.55 phi) at profile 



49 



