Table 2. Muskegon 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 



3.4 



3.8 



2.7 



3.8 



3.9 



4.9 



4.7 



Standard deviation 



1.3 



1.0 



0.7 



1.3 



1.2 



1.4 



1.1 



Breaker height (meters) 

















Average 



0.28 



0.44 



0.35 



0.45 



0.58 



0.68 



0.59 



Standard deviation 



0.26 



0.35 



0.31 



0.45 



0.34 



0.46 



0.36 



Breaker angle (degrees) 

















Average 



96 



103 



87 



88 



95 



99 



102 



Standard deviation 



33 



30 



14 



16 



20 



19 



17 



Breaker type (percent occurrence) 

















Calm 



21 



14 



19 



16 



4 



10 



7 



Spill 



7 



28 



16 



6 



32 



32 



25 



Plunge 











3 







16 



6 



11 



Surge 



57 



48 



48 



35 



28 



26 



29 



Spill-plunge 



14 



10 



13 



42 



20 



26 



29 



Foreshore slope (degrees) 

















Average 



11 



11 



13 



12 



10 



11 



10 



Standard deviation 



2 



3 



4 



5 



2 



3 



2 



Width of surf zone (meters) 

















Average 



3 



31 



48 



26 



24 



41 



27 



Standard deviation 



4 



28 



37 



30 



16 



46 



22 



Current speed (meters per second) 

















Average 



0.12 



0.19 



0.09 



0.18 



0.20 



0.30 



0.22 



Standard deviation 



0.18 



0.27 



0.08 



0.22 



0.21 



0.30 



0.20 



Average velocity 

















(+ right and - left) 



-0.05 



-0.13 



0.05 



0.07 



0.07 



O.IS 



-0.06 



Sand size (phi) 

















Average 



1.43 



1.34 



1.12 



1.27 



1.39 



1.26 



1.43 



Standard deviation 



0.28 



0.28 



0.30 



0.24 



0.27 



0.26 



0.29 



(from Bruno and Hiipakka, 1973) 



