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“Comprehensive Barrier Island Restoration Plan” 2012 National

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“Comprehensive Barrier Island Restoration Plan” 2012 National Mississippi Coastal Improvements Program (MsCIP) “Comprehensive Barrier Island Restoration Plan” 2012 National Conference on Beach Preservation Technology February 10, 2012 Justin McDonald, P.E. Lead Project Engineer, MsCIP US Army Corps of Engineers BUILDING STRONG® MOBILE DISTRICT Presentation Outline • History of the Mississippi Coastal Improvements Program (MsCIP) • Comprehensive Barrier Island Restoration Plan – Restoration of the Barrier Island Sediment Budget • Selection of Sand Placement Locations • Identification of Borrow Sources • Construction Alternatives/Methods Considered • Recommended Plan – Development of a revised Dredge Material Disposal Plan for Pascagoula Navigation Channel – Restoration of the Northern Shoreline of West Ship Island – Restoration of the Eastern Shoreline of Cat Island • Conclusions 2 MOBILE DISTRICT Mississippi Coastal Improvements Program • P.L. 109-148, 30 December 2005 • Comprehensive Planning to Address – Hurricane and Storm Damage Reduction – Salt Water Intrusion – Shoreline Erosion – Fish and Wildlife Preservation – Other Water Related Resource Projects • Cost Effective Projects in lieu of NED benefits • Report requirements – Interim Report within 6 months – Comprehensive Plan within 2 years • Compatible with State Coastal Restoration Plan 3 MOBILE DISTRICT Hurricane / Storm Salt Water Intrusion Comprehensive Plan Elements Shoreline Erosion Fish & Wildlife Interim Projects Phase I Projects Ecosystem Restoration Studies Other Studies Hancock Harrison Jackson County County County 4 1 1 1 1 7 1 1 1 3 1 Biloxi 3 1 10 1 Gulfport 6 1 Moss Point 6 5 5 2 7 8 8 11 Gautier 3 2 1 4 3 1 3 Pascagoula Gulfport 3 9 1 1 1 1 1 3 3 9 2 1 12 1 1 1 Bay St. Louis 10 1 3 1 1 1 3 6 Waveland 4 1 12 11 13 3 15 Petit Bois 1 1 14 1 1 1 1 1 Horn 1 4 Ship 5 Cat High Hazard Risk Area 1% Chance Flood Risk Katrina Inundation Limits Littoral Zone Placement of Sand O&M Beneficial Use Placement 4 MOBILE DISTRICT Comprehensive Barrier Island Restoration Plan • Sediment budget of barrier island chain • Revised dredge material disposal plan for Pascagoula navigation channel • Northern shoreline of West Ship Island • Eastern shoreline of Cat Island 5 MOBILE DISTRICT Original Placements for Restoration of Sediment Budget – Mississippi Barrier Islands Original Borrow 45 miles 6 MOBILE DISTRICT Recommended Placements for Restoration of Sediment Budget – Mississippi Barrier Islands 7 MOBILE DISTRICT Criteria for Selection of a Borrow Source • Sand compatibility – Particle shape (roundness) – Gradation (D50 of sand on Ship Island = 0.30 mm) – Color • Out of active littoral transport system • Minimal wave focusing • Cost 8 MOBILE DISTRICT Borrow Sites Being Considered 9 MOBILE DISTRICT Ship Island Borrow Site 10 MOBILE DISTRICT DA-10 Borrow Site 11 MOBILE DISTRICT Petit Bois Borrow Site 12 MOBILE DISTRICT Other Borrow Sites Being Considered 13 MOBILE DISTRICT Available Borrow Quantities Computed Available Borrow D50 Volume Dredge Efficiency for Use Site (mm) (mcy) % (mcy) Petit Bois 0.32 15.7 85 13.3 DA-10 0.33 5.4 100 5.4 Ship Island 0.21 8.7 100 8.7 Lower 0.30 2 100 2 Tombigbee 14 MOBILE DISTRICT Construction Alternatives/Methods Considered • Alternative 1 – Camille Cut: (16.0 m.c.y, D50 = 0.28 mm) • Dredge coarser sand from Petit Bois using hopper dredge (8.0 m.c.y.) • Dispose coarser sand on top of finer sand in Ship Island Borrow (8.0 m.c.y.) • Use cutterhead to make single cut and place “mixed” material in Camille Cut – East Ship Island: (Same for all alternatives) • Dredge DA-10 using cutterhead and load into scows • Pump-off directly to East Ship Island (5.4 m.c.y., D50 = 0.33 mm) – Pros: • Mixing will be achieved with the use of one dredge during final placement – Cons: • Sand from Petit Bois will have to be pumped off due to the depth of water in Ship Island Borrow • Material will have to be double-handled ($$$$) • Wave focusing due to excavation of Ship Island Borrow 15 MOBILE DISTRICT Construction Alternatives/Methods Considered • Alternative 2 – Camille Cut: (16.0 m.c.y, D50=0.28) • Dredge coarser sand from Petit Bois using hopper dredge • Dispose coarser sand south of finer sand in Ship Island Borrow in deeper water • Use two cutterhead dredges with merged discharge lines to place “mixed” material in Camille Cut – East Ship Island: (Same for all alternatives) • Dredge DA-10 using cutterhead and load into scows • Pump-off directly to East Ship Island (5.4 m.c.y., D50 = 0.33 mm) – Pros: • Hopper dredges carrying Petit Bois sand can directly dispose in deep water south of Ship Island Borrow – Cons: • Material will have to be double-handled ($$$$) • Wave focusing due to excavation of Ship Island Borrow 16 MOBILE DISTRICT Construction Alternatives/Methods Considered • Alternative 3 – Recommended – Camille Cut: (14.3 m.c.y., D50 = 0.32 mm) • Dredge coarser sand from Petit Bois using hopper dredge and dispose directly into Camille Cut via pump-off (13.3 m.c.y.) • Dredge finer sand from Ship Island Borrow using a cutterhead dredge and pump directly to Camille Cut (1.0 m.c.y.) • Ship Island sand will serve as a cap on the fill section to facilitate the growth of beach vegetation – East Ship Island: (Same for all alternatives) • Dredge DA-10 using cutterhead and load into scows • Pump-off directly to East Ship Island (5.4 m.c.y., D50 = 0.33 mm) – Pros: • Coarse material which results in a more stable fill section • No double-handling of material • Minimal wave focusing due to the small quantity from Ship Island Borrow • Most cost effective alternative 17 MOBILE DISTRICT Proposed Modification to Dredge Material Disposal Plan 18 MOBILE DISTRICT West Ship Island North Shore Restoration 560,000 c.y. of Sand Placement 1,300 c.y. of Rock/Rubble Removal 5,200 ft of Turbidity Barrier 19 MOBILE DISTRICT West Ship Island North Shore Planting 12, 800 ft of Sand Fence 430,000 Beach Plantings – (Herbs, Grasses, & Shrubs) 20 MOBILE DISTRICT Cat Island Eastern Shoreline Restoration CAT ISLAND FILL PLACEMENT – 2.0 M C.Y. CAT ISLAND BORROW AREA 21 MOBILE DISTRICT Conclusions • MsCIP Comprehensive Barrier Island Restoration Plan was developed in response to Hurricane Katrina – 4 Components – Restore Sediment Budget • Placement Locations – Camille Cut/East Ship Island • Borrow Sources – Ship Island, DA-10, Petit Bois, and Lower Tombigbee River • Recommended Plan – 14.3 M c.y. in Camille Cut & 5.4 M c.y. at East Ship Island – Revise Dredge Material Disposal Plan for Pascagoula Nav. Channel • Dispose of dredge material further to the south and west of the existing site – Restore Northern Shoreline of West Ship Island (90% Complete) • Placement of approx. 560,000 c.y. of sand • Removal of approx. 1,300 c.y. of rock/rubble • Installation of 5,200 ft of turbidity barrier to protect SAV • Install 12,800 ft of sand fence & plant approx. 430,000 plants – Restore Eastern Shoreline of Cat Island • Placement of approx. 2.0 M c.y. of sand 22 MOBILE DISTRICT www.mscip.usace.army.mil 23 .
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