Figure 6. Potential overv;ash conditions associated with extratropical and 

 tropical cylcones for the Louisiana coast. East delta refers to the St. 

 Bernard delta region, whereas west delta refers to the Lafourche delta region. 

 Hurricane landfall at the Lafourche delta is the western track and the eastern 

 track corresponds to landfall in the St. Bernard delta. Overwash elevations 

 are measured in meters above mean sea level. 



Barrier Sands 

 Lagoonal Deposits 



Increasing 



Washover 



Volume 



, Overwash 



Figure 7. Two modes of coastal barrier sediment loss: (1) increasing washover 

 storage, and (2) inequality in onshore-offshore sediment transport. 



21 



