PLAQUEMINES PARISH BARRIER ISLAND RESTORATION & SUSTAINABILITY. MVD/Gulf Coast Regional Dredging Meeting November 5, 2013
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1 PLAQUEMINES PARISH BARRIER ISLAND RESTORATION & SUSTAINABILITY MVD/Gulf Coast Regional Dredging Meeting November 5, 2013
2 OVERVIEW 1. Barrier Island Restoration Projects in Plaquemines Parish 2. Plaquemines Parish Conceptual Restoration Plan: ERDC Modeling Results 3. Plaquemines Parish Sustainability Study 4. Innovative Dredging Opportunities: A Programmatic Approach 5. Questions
3 BARRIER ISLAND RESTORATION PROJECTS EAST GRAND TERRE TO SCOFIELD ISLAND Modern Delta System Source: CPRA, Barrier Island Status Report, FY2014 Annual Plan.
4 EAST GRAND TERRE ISLAND RESTORATION 621 acres of barrier island created 2.8 miles of barrier shoreline restored +6 ft dune from 4.6 MCY of sediment East Grand Terre, 2013.
5 BARATARIA ISLAND COMPLEX PROJECT PELICAN ISLAND & PASS LA MER TO CHALAND PASS Pass La Mer to Chaland Pass 484 acres created including 254 acres of back barrier marsh Pelican Island Used 4.6 MCY of mixed sediment from 4 borrow sources to create 192 acres of beach-dune habitats and 398 acres of marsh platform Pelican Island with Emergency Berm W9, before restoration.
6 BAY JOE WISE SHORELINE RESTORATION Created 350 acres of marsh platform, ~1,000 ft wide Dredged 3 MCY of sediment from 3 borrow sources Included tidal creeks, ponds and vegetation plantings Bay Joe Wise, under construction, 2009.
7 RIVERINE SAND MINING SCOFIELD ISLAND RESTORATION Constructed by sand dredged from the Mississippi River via 22 mile long pipeline Created ~11,400 ft long beach and dune fill Dune includes 50 ft wide crest at +6 ft Created 11,800 ft long marsh platform on the bay side of the island; 375 acres Berm to Barrier
8 SHELL ISLAND RESTORATION Shell Island East Constructed with MCY of sand from Lower Mississippi River (Same source as Scofield) Created an 8 foot high dune with a crest width of 340 feet, and a 5 foot high and 1,100 foot wide beach over a project length of about 5,380 feet Shell Island East restored. Berm to Barrier
9 FUTURE PROJECTS Shell Island West In design phase and proposed for NRDA funding Design includes 15,750 feet of shoreline with a dune elevation of 8 feet, creating a surface area of about 277 acres with 7.6 MCY of riverine sand; 308 acres of marsh with 2.1 MCY Cheniere Ronquille today. Cheniere Ronquille Barrier Island Restoration Goal: expand gulf shoreline structural integrity by tying into adjacent completed projects to the east; will create 127 acres beach/dune & 259 acres back marsh
10 PLAQUEMINES PARISH CONCEPTUAL RESTORATION PLAN
11 MODELING SELECTED STORM TRACKS (~100 yr) BARRIERS PLANNED TO BE RESTORED Track 150 Track 126 Track 108 Track 25
12 MODELING RESULTS Demonstrated the benefits of coastal restoration projects on reducing storm surge. Barrier islands were most effective type of project. Reduction of storm surge by 3 to 4 ft is possible. Benefits are related to barrier heights of 10 to 12 ft. Barrier islands also reduce storm wave heights behind islands.
13 MODELING RESULTS Maximum Surge Envelope Storm Track 25 Peak Water Level, m Base Condition Plan 4 Condition Difference, m Track 25
14 PLAQUEMINES PARISH SUSTAINABILITY STUDY PLANNED OR CONSTRUCTED PROJECTS
15 FINDINGS: BARRIER ISLAND ELEVATION A relatively high dune cross-section (~ +14 feet NAVD) is a more sustainable barrier island design than the +6 or +8 foot NAVD dune cross-sections that have been used for previously designed or constructed projects. A barrier island project with a high dune cross-section is more likely survive and provide benefits after powerful Category 3 hurricane than one with a lower dune cross-section. The higher dune cross-sections will have, at most, minor effects on regional storm surge, wave, and salinity plume propagation.
16 BARRIER ISLAND CHENIER RONQUILLE +8 NAVD Pre-Storm +14 NAVD Pre-Storm +8 NAVD Cat. 3 Post-Storm +14 NAVD Cat. 3 Post-Storm
17 INNOVATIVE DREDGING OPPORTUNITIES Purpose: Assess efficiencies that could be achieved through alternative dredging practices. 1. Innovative contracting and bidding practices to provide for long-term leasing of dredges for coastal restoration; 2. A comprehensive approach to sediment availability and budgeting based on protection/restoration priorities; 3. A multi-project, or programmatic, approach to permitting, scheduling and construction of coastal restoration projects.
18 PLAQUEMINES PARISH PROPOSES A MULTI- PROJECT, PROGRAMMATIC APPROACH Sustainable, low-cost source of sediment via a long-term contract dredge in the Mississippi River Adoption of new construction methodologies, e.g. separate dredging and shaping contractors Coordination and streamlining of permitting multiple projects Sustainable source and commitment of funds to a multi-project program
19 Discussion?
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