US Army Corps of Engineers BUILDING STRONG ® 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
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
US Army Corps of Engineers
BUILDING STRONG®
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
BUILDING STRONG®
Dade County Beach Erosion Control & Hurricane
Protection Project (“Dade BEC&HP”)
BUILDING STRONG®
BUILDING STRONG®
BUILDING STRONG®
Before & After – Fed Project
Initial Fill = 15.1 Mcy / Renourishment = 3.3 Mcy
BUILDING STRONG®
Erosion Continues …
BUILDING STRONG®
BUILDING STRONG®
“Hotspot” !
BUILDING STRONG®
“Hotspot” !
Accretionary Zone
BUILDING STRONG®
BUILDING STRONG®
Most frequent area of
renourishment
(9)
BUILDING STRONG®
32nd St
Breakwaters
Northern
erosive area
Southern
erosive area
BUILDING STRONG®
February 2009
Miami Beach -
Erosional Hotspots
BUILDING STRONG®
South Beach – Accretionary Zone
BUILDING STRONG®
BUILDING STRONG®
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
BUILDING STRONG®
Basic Backpassing Strategy
BUILDING STRONG®
Previous Backpassing Operations :
Truck Haul Operations in 1996, 2002
Larger-scale pumping operations in 2007,
2012.
BUILDING STRONG®
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
BUILDING STRONG®
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
BUILDING STRONG®
Challenging Construction Zone
BUILDING STRONG®
Challenging Politics
BUILDING STRONG®
Challenging Politics
Original Design
BUILDING STRONG®
Challenging Politics
Original Design
Final Design
BUILDING STRONG®
(16th St.)
BUILDING STRONG®
Borrow R64-R69
Basic Layout of Contract “E” Backpassing Operation
N. Fill R53-R54
S. Fill R60-R61
BUILDING STRONG®
“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
BUILDING STRONG®
Overall Project Layout
BUILDING STRONG®
Overall Project Layout
Borrow zone
BUILDING STRONG®
Overall Project Layout
Borrow zone
Slurry Pump
BUILDING STRONG®
Overall Project Layout
Borrow zone
Slurry Pump
Pipeline
Pipeline
BUILDING STRONG®
Overall Project Layout
Borrow zone
Slurry Pump
Pipeline
Pipeline
Discharge / Earthmoving
equipment
BUILDING STRONG®
Overall Project Layout
Borrow zone
Slurry Pump
Pipeline
Pipeline
Discharge / Earthmoving
equipment
BUILDING STRONG®
Equipment / Setup
BUILDING STRONG®
Overall Layout
BUILDING STRONG®
Overall Layout
BUILDING STRONG®
Overall Layout
100’
BUILDING STRONG®
Overall Layout
BUILDING STRONG®
Overall Layout
BUILDING STRONG®
Overall Layout
BUILDING STRONG®
Overall Layout
BUILDING STRONG®
Overall Layout
BUILDING STRONG®
Excavation at the Borrow Site
BUILDING STRONG®
Stockpiling Borrow Material
BUILDING STRONG®
Safety Zone Around Loader
BUILDING STRONG®
Pump and Hydraulic Loader
BUILDING STRONG®
Loading the Hopper
BUILDING STRONG®
Discharge Pipeline
BUILDING STRONG®
Booster Pump
BUILDING STRONG®
Slurry Discharge
BUILDING STRONG®
Discharge / Fill Area
BUILDING STRONG®
Discharge / Fill Area
BUILDING STRONG®
Final Placement and Shaping
BUILDING STRONG®
Finished Project
BUILDING STRONG®
B/A -C
BUILDING STRONG®
BUILDING STRONG®
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
BUILDING STRONG®
Questions ?
Related Documents
