Parameter Data Base 



170. A set of all the parameters described above has been computed for 

 each frequency- direction spectrum thereby forming a parameter data base with 

 which to characterize the observations. Parameters are grouped by analysis 

 objectives. This section defines the groups and summarizes the set of 

 parameters . 



171. The first group contains properties associated with a collection. 

 They are: 



Parameter Definition 



Date/Time Collection date and start time 



Gage Pattern List of checked, operating gages 



Depth Mean water depth during the collection 



172. The second group contains integral parameters of and properties 

 uniquely determined from the frequency-direction spectrum as a whole. They 

 are: 



Parameter Definition 



Hn,o Characteristic wave height, four times the 



square root of the volume under the 

 frequency- direction spectrum 



f PP Peak frequency from the maximum of S(f^,6^) 



6 -YD Peak direction from the maximum of S(fjj,^j„) 



A^sw Spectrally weighted directional spread from 



Equation 23 



173. The third group is simply the peak frequency and its inverse, the 

 peak period, from the integrated frequency spectrum. Peak frequency and peak 

 period are two of the conventional parameters of sea state characterization. 

 They are : 



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