more waves approaching from northern angle bands than from southern angle 

 bands, whereas the SIO gage data show less than 10 percent more waves from 

 this direction. The average monthly incident wave angle and standard devia- 

 tion, a, of the wave angle were calculated for the LEO stations and the gage 

 data. The results are presented in Table 2, and confirm that the variability 

 of the gage data is much less than that of the LEO stations. Also, the LEO 

 station data sets each contain only 3 months with positive average incident 

 wave angles (waves approaching from the south) , whereas the gage data have 6 

 months with a positive average angle. These comparisons led to the conclusion 

 that the incident wave angles would probably require adjustment during cali- 

 bration of the shoreline change model if the SIO gage data set was used. 



Table 2 

 Representative Average Monthly Incident Wave Angles 1 







LEO; Bolsa Chica 



LEO; Hunt: 



Lngton Bch. 



SIO 



gage 



Month 



(dee) 



a 2 



(deg) 

 -24.5 



a 2 

 10.4 



(dee) 



a 2 



January 



-9.1 



6.4 



-3.8 



3.2 



February 



-3.8 



7.4 



-11.2 



11.1 



-5.1 



2.8 



March 



-18.5 



12.4 



-6.4 



11.3 



-4.7 



3.4 



April 



-17.8 



9.1 



-16.5 



11.5 



-3.4 



4.3 



May 



-16.4 



13.5 



-1.2 



11.7 



0.6 



4.2 



June 



-11.0 



16.4 



3.9 



9.4 



1.7 



4.2 



July 



1.0 



14.3 



25.8 



11.9 



3.3 



4.5 



August 



6.2 



13.0 



-4.6 



13.5 



3.4 



3.9 



September 



13.9 



13.2 



-1.4 



9.3 



2.6 



4.0 



October 



-4.7 



9.5 



4.7 



12.5 



2.5 



3.7 



November 



-8.8 



11.2 



-9.2 



12.5 



-1.8 



5.3 



December 



-9.3 



5.6 



-12.0 



17.6 



-5.1 



3.3 



1) Data transformed to 26. 9 -ft depth. 



2) Symbol a represents standard deviation of wave angle (deg). 



The distributions of wave period and wave height were calculated for the 

 LEO stations, the MA hindcast, and the gage data. All four data sources show 

 similar distributions of wave period. The calculated distributions of wave 

 height for the LEO stations and the gage data indicate that the gage data have 

 a greater percentage of larger wave heights than the LEO stations; however, 

 the distribution of the wave heights for the three data sources are similar. 



Based on these comparisons of the available wave data for the project 

 site, a decision was made to use the SIO gage data as input to the shoreline 



67 



