Non Rock Alternative to Shoreline Jamie M. Bartel, Project ... Presentations/July 29,...

Non Rock Alternative to Shoreline Protection CEER 2014 July 29, 2014

Jamie M. Bartel, Project Manager, CDM Smith Scott Bartkowski, President, Living Shoreline Solutions Inc.

Project Overview • Project Client: USDA, Natural Resources

Conservation Service (NRCS) • Project Team: Living Shorelines Solutions

Inc. (LSSI) and CDM Smith • Purpose: Develop a viable, innovative

non-rock alternative to shoreline protection for a 500-foot linear area at each of three sites within the Louisiana coastal zone.

• Challenges: – Unique shoreline field conditions – Previous solutions questionable in

terms of their limitations, or – No previous solutions

Description of Services: Provide site specific design for installation

Phase I Proposal (Technical Approach and Cost Estimate) Phase II Design (100%) Phase III Construction

** Evaluation criteria applied at each Phase to determine selection

Phase I: Technical Approach

• The technology proposed was Wave Attenuation Devices (WADs ®) developed exclusively by LSSI (U.S. Patent 6,186,702B1).

The WADs ® are a unique design developed to both reduce shoreline erosion and produce habitat in the most general terms and the design is flexible for various coastal situations. • The initial approach identified work scope items to support conceptual design

efforts to be further developed in Phase II, including: – Site visits, confirmation of field conditions, bathymetry – Wave, wave force analysis, water level analysis – Geotechnical and structural evaluation – Design evaluation, material quantity and cost estimates, quality review – Installation plan, QA/QC plan, H&S plan, O&M plan

Phase II: Engineering and Design • Iterative design approach- 75 days to

complete – Challenges to overcome:

• substrate conditions (soft peat mix) • wave attenuation • WAD height can be maintained 1.5 feet

above MHW-- for shoreline erosion reduction

• Wave loading analysis (CMS-Wave), water level, tidal range, bathymetry, wind statistics

– Water depths averaged 5-6 feet – Tidal range 0.35 – 1.70 feet – Average wind speed 35 miles, – Wave height 2.2-2.8 feet, fetch 9 – 19

miles – Wave period 2.6 – 3.7 seconds – Wave attenuation for WADs 90%

• Geotechnical Analysis, load bearing capacity and settlement

– Substrate, load bearing capacity = 400 psf

– WAD design, anticipated bearing pressure = 135 psf (13,500 lbs/unit)

– Anticipated consolidation settlement – 20 inches over 3-years

• Structural analysis – Factor of safety against overturning

moment 1.88

Phase III: Final Design and Construction

Based on available funding, going into Phase III, LSSI/CDM Smith utilized one site for demonstration at this time, Shark Island

Phase III: Construction (cont’d) • Manufacturing of the WAD forms – 16

built in 90 days • Transport forms to site • Pours were done daily and completed in

20 days • WADs were cured 3-5 days to reach

5000 psi • 30-day psi was 8,000 psi upon

deployment

Construction and Installation

CEER, July 2014

• WADs assembled on land • Loaded onto the excavator loaded barge • Transported to the site

Construction and Installation

• Installation - 6 days total

• 1 WAD installed every 4 minutes

• No initial settling of the units as predicted (2 feet was estimated)

CEER, July 2014

Final Array-As Installed

Design/Installation Advantages: • No barge canal required here to

transport WADs to the site • Material and installation costs

minimized by using local support • Quick assembly/installation

Other Benefits • Soil accretion along shoreline • Habitat creation

CEER, July 2014

Questions?

CEER, July 2014

Thank you!