Table 5. 



Sediment statistics 

 1973 to December 197 



summary , 



eastern Lake Michigan (October 



Profile 

 line 



Foreshore 



Backshore | 



Sand 



size (ram) 



Composition (pet by weight) 



Sand 



size (mm) 



Conpositio 



1 (pet by 



weight) 



Median 



Std. dev.^ 



Gravel 



Sand 



Silt 



Median 



Std. dev.2 



Gravel 



Sand 



Silt 



1 



0.52 



0.07 



64.9 



35.0 



<0.1 



0.36 



0.02 



2.3 



97.6 



<0.1 



2 



0.41 



0.08 



32.1 



67.9 



<0.1 



0.32 



0.02 



0.6 



99.3 



<0.1 



3 



0.46 



0.09 



58.8 



41.1 



<0.1 



0.35 



0.03 



2.3 



97.5 



0.2 



4 



0.33 



0.04 



0.6 



99.4 



0.0 



0.28 



0.01 



0.0 



100.0 



<0.1 



5 



0.41 



0.05 



42.1 



57.8 



0.1 



0.31 



0.04 



9.2 



90.1 



0.7 



6 



0.31 



0.03 



4.0 



96.0 



<0.1 



0.26 



0.02 



0.0 



100.0 



CO 



7 



0.35 



0.05 



3.6 



96.3 



0.1 



0.27 



0.05 



3.2 



86.3 



10.5 



8 



0.42 



0.14 



9.1 



90.9 



<0.1 



0.32 



0.04 



0.0 



99.9 



0.1 



9 



0.30 



0.04 



0.1 



99.9 



<0.1 



0.26 



0.01 



0.0 



99.9 



0.1 



10 



0.37 



0.05 



15.8 



79.0 



5.2 



0.25 



0.04 



2.4 



43.1 



54.5 



11 



0.43 



0.04 



4.2 



95.8 



<0.1 



0.30 



0.02 



0.1 



99.6 



0.3 



12 



0.60 



0.20 



38.2 



61.8 



<0.1 



0.28 



0.02 



0.0 



99.9 



<0.1 



13 



0.68 



0.10 



62.4 



37.5 



0.1 



0.24 



0.03 



6.5 



36.3 



57.1 



14 



0.34 



0.06 



7.7 



92.1 



<0.1 



0.29 



0.01 



0.0 



99.9 



0.1 



15 



0.37 



0.05 



21.9 



76.6 



1.5 



0.29 



0.06 



5.8 



33.7 



60.5 



16 



0.42 



0.09 



18.0 



81.9 



0.1 



0.28 



0.01 



0.0 



99.9 



0.1 



17 



0.51 



0.15 



15.7 



84.3 



<0.1 



0.26 



0.02 



2.1 



39.0 



58.9 



Average 



0.42 



0.08 



23.5 



76.1 



0.4 



0.29 



0.03 



2.0 



83.6 



14.4 



^All values are annual averages of 12 monthly averages. Data taken in the same month (e.g., October 1973 

 and October 1974) were first averaged together. 



^This Is the standard deviation of 12 monthly median sand sizes, not the average standard deviation of the 

 sample distributions. 



D 



0.7 



0.6 



E 0.5 



io 0.4 



0.3 



0.2 



0.1 



1 



Foreshore 



Backshore 



I 2 3 4 5 6 7 8 9 10 II 12 13 14 15 16 17 



Profile Line 



Figure 15. Longshore variation in foreshore and backshore median 

 sand size, eastern Lake Michigan. 



32 



