Autocorrelation of transmitted waves, py, is taken as the average autocorre- 

 lation of any gage measuring transmitted waves. (Note that p may vary between 

 1.0 and -1.0.) A large positive value of p means that waves are strongly 

 grouped. Values of P near zero mean that there is little relation between 

 successive wave heights. A negative value of the autocorrelation implies that 

 small waves follow large waves and vice versa. Several wave records measured 

 in this study with various values of P are shown in Figure 5. Note that in 

 all cases the water levels have been normalized by the significant wave height. 



7807251105 



P--0.7\ 

 Op=3.58 

 Hs: 7.38cm 



Strong 



Moderote 



Weak 



Negotive 



Figure 5. Sample laboratory wave records showing various 

 levels of wave grouping. 



19 



