shorelines to the introduction of a littoral barrier in the local littoral 

 cell. The comprehensive wave hindcast effort involved a 20-year hindcast of 

 wave conditions for the Bolsa Chica region. The hindcast provided estimates 

 of locally- generated wind sea and Northern Pacific swell wave conditions at 3- 

 hour intervals for the 20-year hindcast period 1956 to 1975. A supporting 

 effort was an 18 -month hindcast of Southern Pacific swell wave conditions, 

 which provided an estimate of the importance of this component of the local 

 wave climate. 



After the wave hindcasts were complete, a comprehensive shoreline re- 

 sponse modeling effort was initiated in which the hindcast wave estimates were 

 used as input to the shoreline change model. A description of the shoreline 

 response tasks, details of the wave hindcasts, and the overall study results 

 is presented in Gravens 1988, and Gravens (1990). 



STUDY AREA 



Bolsa Chica is located in southern California in an unincorporated area 

 of Orange County about 9 miles south of Long Beach and is surrounded by the 

 City of Huntington Beach (Figure 1). The site of the proposed entrance system 

 is located approximately 3 miles south of Anaheim Bay and 7 miles north of the 



LOS ANGELES 



16000 FT 



Figure 1. Bolsa Chica study area 

 62 



