Table 1. Warren Dunes State Park (Lake Michigan); 



Littoral Environment Observation Program (1972). 



Wave and Beach Data 



Month 





May 



June 



July 



August 



September 



October 



November 



Breaker period (seconds) 

















Average 



3.6 



4.2 



3.2 



4.0 



4.1 



4.5 



4.5 



Standard deviation 



0.9 



1.5 



0.9 



2.3 



1.0 



1.1 



0.7 



Breaker height (meters) 

















Average 



0.24 



0.39 



0.20 



0.36 



0.40 



0.40 



0.41 



Standard deviation 



0.28 



0.41 



0.2S 



0.35 



0.32 



0.36 



0.34 



Breaker angle (degrees) 

















Average 



92 



96 



90 



90 



88 



88 



87 



Standard deviation 



21 



12 



16 



12 



13 



9 



9 



Breaker type (percent occurrence) 

















Calm 



29 



28 



20 



11 



11 



26 



21 



Spill 



24 



36 



27 



25 



4 











Plunge 







8 



3 



4 



7 



26 



29 



Surge 



24 



8 



40 



21 



22 



26 



18 



Spi 1 1-plunge 



24 



20 



10 



39 



56 



23 



32 



Foreshore slope (degrees) 

















Average 



9 



7 



9 



7 



6 



6 



7 



Standard deviation 



2 



3 



2 



3 



2 



2 



1 



Width of surf zone (meters) 

















Average 



16 



21 



12 



8 



6 



5 



8 



Standard deviation 



9 



42 



9 



7 



6 



4 



4 



Current speed (meters per second) 

















Average 



0.13 



0.18 



0.12 



0.25 



0.28 



0.24 



0.28 



Standard deviation 



0.14 



0. 19 



0.12 



0.27 



0.23 



0.23 



0.29 



Average Velocity 

















(+ right and - left) 



-0.07 



-0.15 



-0.03 



-0.09 



-0.15 



-0.02 



-0.09 



Sand size (phi) 

















Average 



1.58 



1.24 





1.45 



1.47 



1.36 



1.16 



Standard deviation 



0.37 



0.2S 







0.39 



0.29 



0.28 



0.51 



(from Bruno and Hiipakka, 1973) 



14 



