Table 4 



Effect of Overlapping Bands on T p Estimates, Array 



Date 



T p (sec) 



Standard Analysis 



Overlapping Bands, Two-Line 

 Offset 



1311 03 Jan 94 



14.3 



14.8 



1314 20 Jan 94 



10.0 



10.1 



0719 31 Jan 94 



20.0 



18.0 



Because of these considerations, the SIO procedure for estimating T p values 

 for wind waves and swell in this study was modified to an overlapping approach 

 with a one-line overlap. Thus the reported T p corresponds to the midpoint of the 

 82 consecutive spectral lines which collectively have the highest energy in the 

 spectrum. 



Results 



Parameters and spectra from the CDIP array and harbor gages were studied 

 and evaluated in various ways to better understand harbor behavior and to 

 prepare results in a form useful for validating the numerical model. Summaries 

 are included in Appendix A of this report and in monthly compendia (e.g., 

 Coastal Engineering Research Center (1996)). Complementary studies by 

 Okihiro and Guza (1996) have also contributed to understanding of the harbor. 



Parameters 



Parameter time-histories were plotted by month, as illustrated in 

 Figures 15-17. The plots are useful for reviewing the variety of conditions 

 recorded and for identifying relationships between parameters. As an example, 

 Figure 16 shows a strong tendency for high values of H s and H slong to occur 

 together. Correlation coefficient statistics were computed between selected 

 parameters, as illustrated in Table 5 for Pier 2. The correlation coefficient for H s 

 and H slong is fairly high, 0.81 at Pier 2. That correlation was also high at other 

 gages (not shown): 0.74 at the array and between 0.61 and 0.72 at the other 

 harbor gages. Other parameters showed lower correlations, but evidence of some 

 other tendencies, such as a weak correlation between H lJong in the harbor and 



y^s'array' 



The variation of A^ §J and A ampl with various long and short wave parameters 

 is an important concern. These parameters are actually quite consistent at any 

 given location. For example at Pier 2, A amptS is around 0. 1 and A amp , is generally 

 between 1.2 and 1.8. Peaks in A amps tend to coincide with long period swell 

 events (high values of T p ). The smallest values of A ampl generally occur with 

 high energy events (high values of H s and H slong ). 



Chapter 2 Field Wave Measurements 



19 



