(3) Case 2.cl . In this simulation, sediment is added to the system each 

 month. It was simulated by advancing the 7- and 11-foot contours on a 

 monthly basis to represent 121,000 cubic yards per month. Specifically, the 

 sand volumes were "tapered" starting at the center of the nourished area over 

 a distance of + 2,700 feet from the center. Table 2 presents the monthly Ay 

 values for the blocks between the 7- to 11-foot contours and the 11- to-14 

 foot contours. Figure 13 shows the planform Ay values added monthly. WIS 

 waves were used with the sequence being the normal calendar year, January 

 through December. 



contour 1 



depth = 4.0 ft 

 increment f -— 



T 



145.8 ft 



^ 



200 ft = width of 

 grid 



OFFSHORE 

 DIRECTION 



I = 14 16 18 20 22 24 26 28 30 32 34 36 38 



Figure 13. Monthly incremental values of Ay due to dredge disposal 



illustrated for the block between 7- and 11 -foot contours 



The initial and final fifth and sixth contours have been plotted in 

 Figures 14 and 15. The first figure has no distortion; the second is 

 distorted 10 to 1. The simulation predicts that 31.7 percent of the dredge 

 disposal will move shoreward out of the control volume. An additional 29.7 

 percent efflux occurs in the offshore and longshore directions, leaving only 

 38.6 percent of the total amount of sediment added remaining in the control 

 volume. It is not clear what quantity of the sediment leaving in the 

 longshore direction would reach shore. It is conceivable that most of this 

 sediment would eventually reach the surf zone. The rate at which this 

 material would move ashore would be expected to be slower than the rate at 

 which the large mounds would move ashore because the deviation of the profile 

 from equilibrium is much less. 



(4) Cases 2.c2, 2.c3, and 2.c4. T he next three simulations were the 

 same as 2.cl except the time series of wave events has been seasonally 

 altered. Cases 2.c2, 2.c3 and 2.c4 use the 1975 wave climate from April 

 through March, July through June, and October through September, respectively. 

 The maximum variation is about 5 percent for the sediment volume moving 

 onshore, and about 10 percent for the volume remaining. The variation in the 



39 



