The subject of beach fill and its design is covered in detail by Krumbein 

 and James (1965), James (1974), Hobson (1977), and U.S. Army, Corps of Engi- 

 neers, Coastal Engineering Research Center (1977). 



3. Primary Sand and Gravel Deposits. 



The seismic profiles and cores taken during this study reveal that 14 

 primary areas are present in Long Island Sound which contain relatively large 

 quantities of sand and gravel that are accessible by conventional dredging 

 methods. All areas in relation to the entire Sound are shown in Figure 16; 

 the pertinent information for each deposit is included in Table 5. 



1 1 1 1 1 1 



12345 »ni 

 ■ ■ i i i i 

 2468 10 Im 



U T.££ g£ 



Fishers 



10 - 



slock isliho 



S0U//0 



Figure 16. The 14 primary sand and gravel deposits identified in Long Island 

 Sound. 



The areal extent of each site is based on seismic data and ba thyme trie 

 information; the thickness of each deposit was judged from the recovered 

 sediment in the cores for each area. In many cases the seismic profiles show 

 that sand in the deposits is considerably thicker than the amounts recovered 

 in the cores, and that sand is also present in other parts of the Sound; 

 however, the sand is either covered by various thicknesses of overburdens of 

 modern fine-grained estuarine sediments, or is in water depths presently too 

 deep for economic recovery. Therefore, a total volume of 189 million cubic 

 meters of sand and gravel calculated for the entire Sound may be considered a 

 conservative estimate and may be increased if additional long cores were used 

 to explore the deposits in greater detail. 



a. Area A - Matinicock Point Shoals. Area A consists of two irregular 

 shoals inshore of the 15-meter depth contour to the northwest of Matinicock 



38 



