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106 November 2018
The South Amelia Island Shore Stabilization Project:25 Years Old and Planning for the Future
The South Amelia Island Shore Stabilization Project:25 Years Old and Planning for the Future
FSBPA National Conferenceon Beach Preservation Technology
St. Augustine Beach, FL 7 February 2019
FSBPA National Conferenceon Beach Preservation Technology
St. Augustine Beach, FL 7 February 2019
olsen associates, inc.2618 Herschel St.Jacksonville, FL 32204904.387.6114www.olsen-associates.com
Albert E. Browder, Ph.D., P.E., D.CESteven C. Howard, P.E., D.CEPatrick M. Cooper, E.I.
Browder, Howard, Cooper - olsen associates, inc. FSBPA - 07 February 2019
Topics
• Project History
• Permitting for future work
• Borrow area development– Nassau Sound shoals– Delft3D modeling
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Regional Setting
PROJECT AREA
AmeliaIsland
Nassau Sound
St. Mary’s River Entrance
St. John’s River Entrance
Ft. George Inlet
Cumberland Island, Ga
LITTLETALBOT ISLAND
JACKSONVILLE
FERNANDINABEACH
AtlanticOcean
• Amelia Island:– 13 miles
• Project: 3.6 miles– SAISS MSBU: 3.0 miles– State Park: 0.6 miles
• R-59 to R-79– Nassau County, FL
Browder, Howard, Cooper - olsen associates, inc. FSBPA - 07 February 2019
Historical Perspective
State Park
Windsong / Beach Walker
1984
1984
Windsong
Sheetpile wall
1993
Shipwatch / 4th fairway
1992
Browder, Howard, Cooper - olsen associates, inc. FSBPA - 07 February 2019
Beach Nourishment – 1994, 2002, and 2011
52011
2011
2011
1994
1994
Browder, Howard, Cooper - olsen associates, inc. FSBPA - 07 February 2019
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Amelia Island State Park – 2001
Browder, Howard, Cooper - olsen associates, inc. FSBPA - 07 February 2019
Structural Stabilization – 2004 Amelia Island State Park
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Oct 2004
Structures and fillhave reclaimed about65 acres of dry habitat
in the Park
Browder, Howard, Cooper - olsen associates, inc. FSBPA - 07 February 2019
Currently… at year 25
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• Survived Matthew & Irma
• Currently at Year 8 in cycle
• Time to re-permit…
Browder, Howard, Cooper - olsen associates, inc. FSBPA - 07 February 2019
Searching for Sand
and searching…
and searching…
Browder, Howard, Cooper - olsen associates, inc. FSBPA - 07 February 2019
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Borrow AreaDevelopment:Nassau Sound
• Create new tidal channel
• Provide needed sand
• Create a reusable source
• Minimize benthic impact
• Potentially relieve stress on
some inlet shoals Need to assess potential impacts…
Browder, Howard, Cooper - olsen associates, inc. FSBPA - 07 February 2019
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1991
Browder, Howard, Cooper - olsen associates, inc. FSBPA - 07 February 2019
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2001
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2007
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20182018
Browder, Howard, Cooper - olsen associates, inc. FSBPA - 07 February 2019
RecentSeabed
Changes2013 – 2018
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CHANNELMIGRATION
~600,000 cy/yr
BREACH &SHOAL GROWTH
~6,100,000 cy
Browder, Howard, Cooper - olsen associates, inc. FSBPA - 07 February 2019
Numerical Modeling (Delft3D)
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Field Measurements for Calibration
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• Water surface elevations– Tide gages (3 locations)
• Current measurements– Measured by ADCP– Discharge calculations– Tidal Prism
• 16.7 billion gallons in (flood)
• Offshore wave measurements
CSABrowder, Howard, Cooper - olsen associates, inc.
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incoming tide:pre-dredge
TidalFlows
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outgoing tide:pre-dredge
TidalFlows
Browder, Howard, Cooper - olsen associates, inc. FSBPA - 07 February 2019
Field Observation (Nov. 6th)
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outgoing tide:pre-dredge
TidalFlows
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outgoing tide:post-dredge
InitialTidalFlows
Browder, Howard, Cooper - olsen associates, inc. FSBPA - 07 February 2019
PredictedResidualSedimentTransport(pre-dredge)
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InitialPredictedResidualSedimentTransport
(post-dredge)
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South Amelia Island
25
• 25 years of shore protection
• Working toward the next 25
• Developing a renewable, sustainable borrow source
• 25 years of shore protection
• Working toward the next 25
• Developing a renewable, sustainable borrow source
olsen associates, inc.2618 Herschel St.Jacksonville, FL 32204904.387.6114www.olsen-associates.com
Browder, Howard, Cooper - olsen associates, inc. FSBPA - 07 February 2019
