Shelf indicates that offshore sand deposits suitable for beach nourishment may be sparse. 

 Therefore, deposits from the Cape Canaveral area are a potential borrow source for 

 nourishing Volusia County beaches. 



Table 3. Fill Requirements for Brevard County 



Brevard County 



Beach Length 



Initial Fill 



Nourishment 



Annual 

 X 10** 



50-Year 

 X 10** 



(mi.) 



X 10** 



Kennedy Space Center 

 Cape Kennedy A.F. Station 

 City of Cape Canaveral 

 Patrick Air Force Base 

 Indialantic-Melbourne 



4.9 

 4.0 

 2.8 

 2.3 

 2.0 



2.50 



2.00 



0.998 



0.700 



0.603 



0.195 



0.162 



0.240t 



0.082 



0.068 



9.75 

 8.10 

 12.00 

 4.10t 

 3.40 



Totals 



16.0 



6.801 



0.747 



37.35 



*In cubic yards 



tTo be furnished by sand transfer plant at Canaveral Harbor 



b. Suitability. Offshore deposits compare favorably to beach sands in both 

 granulometric and compositional characteristics. Of 119 beach samples collected from 12 

 representative profiles in the Cape Canaveral area by the Jacksonville District, the median 

 size ranges from 0.08 to 1.07 mm (3.8 to —0.1 phi). Average median diameters by position 

 on the beach for all the profiles are summarized in Table 4. Beach samples collected at MLW 

 (Fig. 17) range in mean size from 0.196 to 0.910 mm (2.35 to 0.14 phi); the average mean 

 size for the 27 samples is 0.48 mm (1.10 phi). Comparison of the two average diameters 

 from MLW of 0.42 mm (U.S. Army, Corps of Engineers, 1967), and 0.48 mm (this study) 

 with tlie size distribution of Type A sands (Fig. 12) shows a correlation between the 

 offshore and onshore sand sizes. The spread of mean sizes in Figure 12 and Table 4 further 

 indicates a range of sizes sufficient to provide material for the entire beach profile, from 

 dune to -30 feet MLW. 



Beach sands and offshore Type A sands are similar in mean size, sorting, composition, and 

 particle characteristics. (See Figures 12, 17, and 25.) Mean size versus percent insoluble 

 residue is plotted in Figure 25 for 27 beach sands and 20 representative Type A samples. 

 Beach sands exhibiting insoluble residue percentages similar to shelf percentage Eire 

 (considering total sample) generally coarser in size, probably due to the addition of both 

 coarse, coquina-derived, shells and fresh shells not yet abraded or fragmented. Sands which 

 have undergone selective sorting in the beach zone are finer and more quartzose than the 

 shelf sands. The carbonate of beach and offshore sands is durable; the preponderance of 

 moUusk shells and fragments and the paucity of other more easily abraded biogenic material 

 (calcareous algae, echonoid fragments) qualifies Type A sediment as a suitable source for 

 beach nourishment. Because of variation in properties other than composition, such as 

 texture and spatial distribution, some Type A deposits are not recoverable or deemed 

 unsuitable as a borrow source. 



55 



