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TRANSCRIPT
US Army Corps of Engineers
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JACKSONVILLE DISTRICT
Sand Relocation Project
(Contract “E”)
Dade County BEC & HP Project
Tom R. Martin, P.E.
Senior Coastal Engineer
USACE, Jacksonville District
February 15, 2013
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Dade County Beach Erosion Control & Hurricane
Protection Project (“Dade BEC&HP”)
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Before & After – Fed Project
Initial Fill = 15.1 Mcy / Renourishment = 3.3 Mcy
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Erosion Continues …
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“Hotspot” !
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“Hotspot” !
Accretionary Zone
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Most frequent area of
renourishment
(9)
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32nd St
Breakwaters
Northern
erosive area
Southern
erosive area
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February 2009
Miami Beach -
Erosional Hotspots
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South Beach – Accretionary Zone
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All Dade offshore BA’s are exhausted.
Future borrow options include :
► “Cleaning out” existing offshore BA’s
► Upland sources
► Offshore BA’s outside of Dade County
► Nondomestic sources
► Relocation of material from existing beaches
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Basic Backpassing Strategy
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Previous Backpassing Operations :
Truck Haul Operations in 1996, 2002
Larger-scale pumping operations in 2007,
2012.
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Backpassing Considerations …
Environmental Impacts (at borrow and fill areas)
RSM / Downdrift Impacts
Disruption (tourism, concessionaires, surrounding hotels
and businesses)
Public Safety
Noise, vibration, pollution, aesthetics
Opposition at the borrow site
Low production rate vs erosion
Truck-haul : Unconsolidated fill vs hydraulic placement
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Pumping vs Trucking :
Pro’s & Cons…
Pumping is more efficient for moving large volumes
Less traffic : environmental, safety, aesthetic concerns
Slurry fill compacts better; better performance
Less (?) equipment required
Higher mob/demob costs
Pump/Pipes can be maintenance intensive
Pipeline can limit backpass distance
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Challenging Construction Zone
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Challenging Politics
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Challenging Politics
Original Design
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Challenging Politics
Original Design
Final Design
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(16th St.)
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Borrow R64-R69
Basic Layout of Contract “E” Backpassing Operation
N. Fill R53-R54
S. Fill R60-R61
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“Contract E” – Sand Backpass Operation
Total volume of 84,000 cy backpassed
Length of fill areas = 2,100 feet
Length of borrow area = 5,000 feet
Pumping distances of 1.1 and 2.3 miles
Fill area : 205-ft construction template
Borrow area : 100-ft cut into seaward berm
Methodology : Pipeline transport of slurry
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Overall Project Layout
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Overall Project Layout
Borrow zone
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Overall Project Layout
Borrow zone
Slurry Pump
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Overall Project Layout
Borrow zone
Slurry Pump
Pipeline
Pipeline
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Overall Project Layout
Borrow zone
Slurry Pump
Pipeline
Pipeline
Discharge / Earthmoving
equipment
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Overall Project Layout
Borrow zone
Slurry Pump
Pipeline
Pipeline
Discharge / Earthmoving
equipment
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Equipment / Setup
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Overall Layout
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Overall Layout
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Overall Layout
100’
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Overall Layout
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Overall Layout
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Overall Layout
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Overall Layout
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Overall Layout
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Excavation at the Borrow Site
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Stockpiling Borrow Material
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Safety Zone Around Loader
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Pump and Hydraulic Loader
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Loading the Hopper
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Discharge Pipeline
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Booster Pump
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Slurry Discharge
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Discharge / Fill Area
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Discharge / Fill Area
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Final Placement and Shaping
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Finished Project
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B/A -C
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Lessons Learned
Backpassing can be a viable method if : ► Downdrift effects are not important
► Distance between borrow and fill areas not too great
► Disruptions to beach use/operations not too great
Requires special attention to : ► Public/political aspects : noise, disruption, safety, etc.
► Tradeoffs between trucking and pumping
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Questions ?