Table 1. Preliminary Model Simulations 



1. 800 -ft Channel, Proposed Site, No Sand Management 



(a) Wave Heights Increased 15% 



(b) Wave Heights Decreased 15% 



(c) Wave Angles Shifted +10 Degrees 



(d) Wave Angles Shifted -10 Degrees 



2. 1000 -ft Channel, Proposed Site, No Sand Management 



3. 800-ft Channel, Warner Avenue, No Sand Management 



4. 800-ft Channel, South of Site, No Sand Management 



5. 800-ft Channel, Proposed Site, Dog-Leg, No Sand Management 



6. 800-ft Channel, Proposed Site, 7 Sand Management Concepts 



7. Simulated Shoreline Response Without Project 



for a variety of conditions, including a structured navigable entrance without 

 sand management, a navigable entrance with sand management, and a no-project 

 (existing condition) simulation. 



Table 1 summarizes the simulations performed. The four variations per- 

 formed during the first simulation demonstrated the model's sensitivity to 

 input wave height and wave angle, and it also provided a probable range of 

 shoreline impact. As expected, wave angle variations were more important. - 

 Shoreline response simulations calculated and plotted projected shoreline 

 positions for 5- and 10 -year time periods after construction of a project. 

 These preliminary modeling efforts examined the following: 



a. Differences in shoreline impact due to channel width. 



b. The effect of locating the project upcoast or downcoast from the 

 proposed location. 



c. The estimated annual net longshore transport rate at Bolsa Chica 

 in comparison to historical estimates. (The comprehensive model 

 will verify the range). 



d. The effect of continuing the present beach nourishment project at 

 Sunset Beach. 



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