Kt = 



T^e-'^^^V 





AT 



y 





iSLi) 



That is, a random time series of the sea surface will have 73 percent more 

 maxima than waves. This value also has been found by Pierson (1954). 



Another Important property of pressure fluctuations is represented by 

 the ogive curve whj.ch expresses the distribution of waves with a discrete 

 negative amplitude ■ Ap* , and negative half -period, "t^ . Consider a 

 sample from a pressure record ^ 



Me 



an 



then, the ogive curve Ap is the negative half -period distribution of 

 waves with amplitudes ft^ ^ O , and the ogive cvirve Ap, is the 

 negative half-period distribution of waves with amplitudes Q, -^ I 

 (inches of water), etc. Due to the asjoTuiietry of the record, a discrete 

 Vo does not exactly equal A"t"o but in a sufficiently long record j a.-b 



27 



