Dernieres from Wine Island Pass to Whiskey Pass. Figure 12 depicts this tidal 

 channel as seen from hydrographic data. The channel limits effective landward 

 migration of the barrier and contributes to the net loss of sediment by tidal 

 flux. 



37. The Isles Dernieres represent a once continuous island which has 

 been fragmented into four smaller islands separated by tidal inlets (Figure 13) 

 These inlets include from west to east — Coupe Colin, Whiskey Pass, Coupe Car- 

 men, and Wine Island Pass, a tidal inlet separating eastern Isles Dernieres 

 from the once subaerial Wine Island (earlier known as Vine Island). There is 



^ ^^ ISLES DERNIERES a^w— t-^_ 



c £_^ D 



SCALE 



A. COUPE COLIN 



B. WHISKEY PASS 



C. COUPE CARMEN 



D. WINE ISLAND PASS 



Figure 13. Sketch of Isles Dernieres showing location of tidal inlets 



also a cut through the central Isles Dernieres which may represent an incipi- 

 ent inlet. These inlets are 300-1,200 m wide and range between 6 and 18 m 

 deep. Ebb tidal deltas associated with these four tidal inlets are the prin- 

 cipal sediment sinks for sand lost from the Isles Dernieres area (Penland and 

 Suter 1983). Hurricanes are responsible for producing the strongest ebb cur- 

 rents, which are capable of transporting sediment from the bay to the ebb 

 tidal deltas and beyond. Ebb currents produced during storms probably serve 

 as the major mechanism by which sediment can be transported from the ebb tidal 

 deltas to the shelf area and below effective wave depth. Therefore, hurri- 

 canes play an extremely important role in the removal of sediment from the 

 Isles Dernieres, and as the number of tidal inlets increase so will the effect 

 of hurricanes. To obtain values for the amount of sediment lost to the tidal 

 deltas and the shallow shelf area, the following equation was used. 



28 



