Louisiana State University

Planning, Design, and Construction for Long-term Living Shoreline Sustainability at Lightning Point, Alabama

Bio: Gerald Songy is a coastal engineer at Moffatt & Nichol with 5 years of experience working on coastal restoration and protection projects primarily in the Gulf of Mexico region. He graduated from LSU in 2013 with a B.S. in Civil Engineering, and graduated from TU Delft in 2016 with a masters in coastal and marine engineering and management. He also has experience working for HDR in Corpus Christi, TX on coastal projects in Texas, Louisiana, Florida, and Alaska , and the Coastal Protection and Restoration Authority of Louisiana in Baton Rouge, LA, working on coastal projects included in the Louisiana Coastal Master Plan

Summary: Working with The Nature Conservancy, Moffatt & Nichol has completed ecology-based engineering and design of the Lightning Point Restoration project which involves a one-mile long living shoreline and 41-acre marsh creation and habitat project in Bayou La Batre, AL.

Design features for the Lightning Point Restoration include 41 acres of marsh, tidal creek and high marsh/scrub-shrub restoration utilizing material from a nearby offshore borrow area and an old upland dredge disposal area. Additionally, living shoreline concepts have been implemented including segmented, curvilinear breakwaters to reduce the high erosion rates experienced at the site, which will extend the life of the restored habitats. Functional tidal creeks are being constructed between the breakwaters and the existing shoreline. These tidal creeks were designed by mimicking the natural tidal creeks in the area based on factors such as stream order, sinuosity, drainage areas, bifurcation ratios, etc.

The marsh creation component involves dredging and placing 212,600 cubic yards of fill material for the 34-acre east marsh creation component from an offshore borrow site utilizing an 18 inch cutterhead suction dredge. Another 37,700 cubic yards of in-place fill are to be placed within the 7-acre west marsh creation component by utilizing a 10 inch swinging ladder dredge to cut tidal creeks into an old USACE upland dredge material disposal site. Additional tidal creeks will be cut from the placed marsh creation fill material after sufficient dewatering time. The tidal creeks will be constructed using mechanical excavation with amphibious excavators. Construction for this project began in December 2019 and is estimated to be completed by the end of Summer 2020.

Hosted by: Coasts, Oceans, Ports, and Rivers Institute Student Chapter at Louisiana State University and A & M College at Baton Rouge

Online Location: lsu.zoom.us/j/94985553778

Additional Information can be found at: tigerlink.lsu.edu/event/6463251

Wednesday, October 28 at 4:00pm to 5:30pm


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