LIST OF TABLES 



No. 



Page 



1 Comparison of Total Erosion with Amount Redeposited by 



Overwash 20 



2 Comparison of Total Erosion with Amount Deposited at Spits 25 



3 Comparison of Total Erosion to Amount of Sediment Lost 29 



4 Landward and Lateral Migration of Isles Dernieres 33 



5 Projected Migration of Isles Dernieres 34 



LIST OF FIGURES 



No. Page 



1 Generalized map of south Louisiana showing location of 



Isles Dernieres 4 



2 Stratigraphic strike section depicting the facies relation- 



ships through the Isles Dernieres 5 



3 Historical shoreline changes in the Isles Dernieres barrier 



island arc between 1 853 and 1 983 6 



4 Location map of the Mississippi River Deltaic Plain 8 



5 Recent deltaic lobes of the Mississippi River 11 



6 A three-stage model depicting the evolution of a barrier 



shoreline along abandoned Mississippi River deltas 15 



7 Landward migration of Isles Dernieres from 1887 to 1 980 19 



8 Shoreline response to relative sea level rise 21 



9 Sketch of Isles Dernieres showing the islands' orientation 



and directions of longshore transport 23 



10 Recurved spit at the eastern end of Isles Dernieres 24 



11 Elongated spit at the western end of Isles Dernieres 24 



12 Location of channel behind Isles Dernieres as seen from 



hydrographic data 27 



13 Sketch of Isles Dernieres showing location of tidal inlets 28 



14 A schematic graph illustrating relationships of processes 



with respect to annual rates of sediment deposited 30 



15 Prediction of landward migration for Isles Dernieres 



in next 1 00 years 35 



