700 



Shoreline position (ft) 



Measured 10/09/78 

 Calculated 11/17/79 



Measured 11/17/79 



\ZZZ.'ZZZZZZZZZZ\ 



200 



400 600 800 1000 



Distance alongshore (ft) 



Figure 43. Result of model verification 



The mean absolute difference between the two shorelines was 4 ft; calculated 

 volumetric change was -311 cu yd compared with the measured -335 cu yd. 



Sensitivity and Variability Tests 



398. Prior to using a verified model for predicting shoreline change 

 for alternative designs, the sensitivity of the calculated shoreline response 

 to variations in different key input parameters in the START file should be 

 examined in a systematic manner. (The identification of "key" input para- 

 meters will depend, in part, on the expected applications.) Although here 

 only an analysis is made for selected parameters, the user is advised to 

 undertake similar analyses with several parameters to gain understanding 



169 



