101 



— ::0.8m/century 



a) Sea Level Rise Too 

 Rapid for Barrier to 

 Form (>6000 Years BP) 



b) Sea Level Rise 

 Lessens Allowing 

 Sand to Accumulate 

 at Shoreline 

 (<6000 Years BP) 



Sediment Accumulates 

 at Shoreline Forming 

 Beach and Dune 



^=0.08m/century 



Lagoon 



c) Barrier Grows and 

 Traps a Lagoon 

 (<6000 Years BP) 



^=0.08m/century 



Fig. 7.6. The Role of Shoreward Sediment Transport, Qg , Across the Shelf 

 and Rate of Sea Level Rise in Causing Barrier Island Formation 

 (from Dean, 1987, courtesy of Shore and Beach). 



