Committed to our coast Preliminary Assessment of Restoration Impacts in the Isles Dernieres, Terrebonne Parish, LA CPRA Board Meeting Baton Rouge,

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Presentation transcript:

committed to our coast Preliminary Assessment of Restoration Impacts in the Isles Dernieres, Terrebonne Parish, LA CPRA Board Meeting Baton Rouge, LA March 20, 2019 committed to our coast

Coastal Protection and Restoration Authority of Louisiana Acknowledgements Syed Khalil, CPRA Mark Byrnes, Applied Coastal Research and Engineering Nicholas Enwright, USGS Shea Penland, UNO Mike Miner, The Water Institute of the Gulf Mark Kulp, UNO Ioannis Georgio, UNO TY1-Longshore Transport Coastal Protection and Restoration Authority of Louisiana

Coastal Protection and Restoration Authority of Louisiana

Lobes of Mississippi River deltas

Evolution of Mississippi Deltaic Plain barrier islands (Penland et al

20 August 2003 - 6

Whiskey Island 11/9/2019

Sediment dredged from offshore rebuilt the beach from the Ship Channel to Holly Beach

June 2012 Shell Island

August 2013 Shell Island

East Island 11/9/2019

Profile Equilibration in First Year Erosion Gulf of Mexico Accretion Post Storm TY20 Coastal Protection and Restoration Authority of Louisiana

Initial Adjustments are Complete Gulf of Mexico Post Storm TY20 Coastal Protection and Restoration Authority of Louisiana

Barrier Island Evolution Years Later Future Without Project Future With Project Gulf of Mexico Post Storm TY20 Coastal Protection and Restoration Authority of Louisiana

Coastal Protection and Restoration Authority of Louisiana

10.2 MCY

Courtesy of APTIM (Benedet and Pierro, IN PRESS)

Coastal Protection and Restoration Authority of Louisiana Future Assessments Land Changes Habitat Changes Shoreline Lengths Tidal Pass Cross-Sections Sediment Volumes Elevation Changes Shoreface Slope Changes Cost Benefits TY1-Longshore Transport Coastal Protection and Restoration Authority of Louisiana

QUESTIONS? $103,283,931.85 contract price after CO #5 724 days (650 original) 9,474,159 CY beach/dune fill 974,304 CY marsh fill TE-0100 Cailliou Headlands (Whiskey Island) Construction Complete May 2018