TOTAL LITTORAL DRIFT ROSE FOR 

 ANAHEIM BAY TO SANTA ANA RIVER 



^ — Total downcoast drift 



H-- Total upcoast drift 

 (southern swell year 1) 



V"'" Total upcoast drift 

 (southern swell year 2) 



600 500 400 300 200 100 



Total drift In thousands of cubic yards per year. 

 Figure 3. Total littoral drift rose, Anaheim Bay to Santa Ana River 



Model Calibration and Verification 



The shoreline change model was then calibrated and verified using the 

 same boundary conditions and constraints as were imposed in the preliminary 

 study expect that the transformed hindcast wave estimates were used for wave 

 input rather than the SIO wave gage data. The results of the final model 

 calibration simulation are presented in Figure 4. With regard to the calibra- 

 tion three general observations are noted. First, in the Anaheim Bay entrance 

 area (between alongshore coordinates 220 and 260) , there are significant 

 differences between the calculated and measured shoreline positions. These 

 differences are due in part to the reflection of waves from the east Anaheim 

 Bay jetty (a process which was not modeled) and to a massive (4 million cu yd) 

 renourishment of the Surf side-Sunset feeder beach in 1964. The percentage of 

 fine material contained in the beach fill is unknown; consequently, the 

 initial losses of fill material could not be estimated or accounted for in the 

 model. Model results in this region should be viewed with caution. 



Secondly, in the vicinity of the Huntington Pier (between alongshore 

 coordinates 80 and 90), it is noted that the predicted shoreline positions do 

 not agree well with the survey. The lack of agreement is due to limitations 

 in the groin boundary condition used to simulate the effect of the pier. A 



74 



