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JHN 



1960 



FEB 



ftfw 



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JUN 



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SEP 



OCT 



NOV 



DEC 



MONTH 



Figure 35. RSA-determined mean grain size of the foreshore samples 

 taken in 1980, 500 m north of the FRF pier 



Phi Size 



-1.00 

 -0.50 



0.00 



0.50 



1.00 



1.50 



00 

 50 

 00 

 50 

 00 



mm Size 



2.000 

 1.414 

 1.000 

 0.707 

 0.500 

 0.354 

 0.250 

 0.177 

 0.125 

 0.088 

 0.063 



mm Interval 



0.586 

 0.414 

 0.293 

 0.207 

 0.146 

 0.104 

 0.073 

 0.052 

 0.037 

 0.025 



dominance of the 0.707-mm size (0.50) with some 1.000-mm (0.00) sizes present. 

 The mean, reported at 0.821, is not similar to either size present. The mean 

 is useful for generally classifying the material sizes on the beach; i.e., for 

 distinguishing between coarse, medium, fine, or very fine sand sizes in a 

 sample. The standard deviation is useful for determining the sorting char- 

 acteristics of the sample; i.e., the similarity of the sand sizes. 



77 



