Horseshoe Bend Island – Let the River do the Work › workshops › 2017_07_Landscape... ·...
Transcript of Horseshoe Bend Island – Let the River do the Work › workshops › 2017_07_Landscape... ·...
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Project VignettesJuly 25, 2017
Jeff CorbinoOperations DivisionNew Orleans District
Horseshoe Bend Island – Let the River do the Work
US Army Corps of EngineersBUILDING STRONG®
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BUILDING STRONG®
OVERVIEWNew Approach to the Beneficial Use of Dredged Material
Project Planning and ExecutionManagement and Adaptation
Other Applications along the Atchafalaya River, and Beyond…
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BUILDING STRONG®
Common Practices
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Morgan City
Atchafalaya Bay
Perimeter Dikes
Mechanical Shaping
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BUILDING STRONG®
Let the River do the Work
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Morgan City
Atchafalaya Bay
Strategic Single-Point Discharges(1) Place Material on Developing Sand Bar(2) Upstream Mounds of Erodible Material
(3) Natural Sculpting during Annual Floods
2004
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BUILDING STRONG®
Plan Development
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ProblemCapacity of Bankline Placement Areas Exhausted
Evaluation of Alternatives(1) Convert Wetland Placement Areas into Uplands
(2) Transport Material to the Atchafalaya Bay(3) Transport Material to Shell Island Pass for Dispersion
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BUILDING STRONG®
Plan Development
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ProblemCapacity of Bankline Placement Areas Exhausted
Evaluation of Alternatives(1) Convert Wetland Placement Areas into Uplands
(2) Transport Material to the Atchafalaya Bay(3) Transport Material to Shell Island Pass for Dispersion
(4) Mid-River Mounding of Dredged Material
Implementation HurdlesCould Pilots Safely Transit the Area?
Are We Pushing the Problem Downstream?
What Channel will the Atchafalaya Adopt?
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BUILDING STRONG®
Project Execution (Part 1)
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November 2007
Construction Stats (Fiscal Years 2002 through 2011)
Number of Horseshoe Bend Maintenance Events: 8
Project Partners: Port of Morgan City, Weeks Marine, Mike Hooks Inc., Vicksburg District
Total Quantity & Cost: 7.6 Million Cubic Yards / $27 Million
Mature Island Size: 100 Acres
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BUILDING STRONG®
What’s Different about the Site?
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Aquatic Bed Features
Emergent Wetland Transition Zone
Forested & Scrub-Shrub Wetlands
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BUILDING STRONG®
Management and AdaptationAcknowledge that Crewboat Cut is more Efficient (2011)
Develop a new Dredged Material Management Plan and Construction Costs (2012)Armor the Left-Descending Bankline (2014)
Dredge Crewboat Cut and Certify the new Route (2014)
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BUILDING STRONG®
Project Execution (Part 2)
November 2014
Construction Stats (Fiscal Years 2012 through 2017)
Crewboat Cut Construction (2014)Dike Consrtuction: 74K Tons / $3.8 MillionDredging: 870K Cubic Yards / $2.8 Million
Number of Crew Boat Cut Maintenance Events: 0
Project Partners: Port of Morgan City, Luhr Bros. Inc., Great Lakes Dredge and Dock, US Coast Guard
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BUILDING STRONG®
Atchafalaya, and Beyond
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2013
2016
West Bay “SREDs” Constructed 2009 & 2013 Document & Share Benefits
Atchafalaya Chain Islands (2016)
Mississippi RiverRed Eye Crossing (20??)