167 multi purpose-reefs_final

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Marine Consulting and Research NEW ZEALAND • UNITED STATES • INDONESIA • WORLDWIDE

• Innovative and patented Beach Protection Solutions

• Cutting edge Simulations of Hydrodynamic Processes

• Leaders in Ecological Monitoring and Protection

• Recognized global leaders in Multi-Purpose Reefs and Surf Science

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Multi-Purpose Reefs for Coastal Protection and Amenity Enhancement

An Innovative and Sustainable Solution to Address Coastal Erosion

Boscombe Multi-Purpose Reef, UK

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Challenge Loss of Beaches and Coastal Infrastructure

Loss of Economic and Recreational Resources

Significant Problem for Coastal Communities Worldwide.

Cape San Blas, FL 2004

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Traditional Coastal Protection Solutions

• Seawalls• Groins/Jetties• Emergent Breakwaters• Beach Nourishment

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Seawalls

• Accelerate erosion of beach

• Only protect upland structures

• A ‘last line of defense’

Wave Energy In

Wave Energy Reflected

South Palm Beach, FL

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Groins and Jetties

Move Problem Down the Beach

New Jersey

Sediment

Boynton Inlet, FL

Sediment

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Emergent Breakwaters

• Tombolos inhibit natural flow of sand

• May cause downstream erosion

• Negative aesthetic appeal

32nd Street, Miami, FL

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Beach Nourishment and Restoration• Replaces lost sand

• Does not stop erosion

• Repetitive applications required

• Average cycle: 5 - 10 years

• Expensive

• Typical Cost ≈ $3 Million per MileSt. Augustine, FL

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Beach Nourishment and Restoration

Many stakeholders are advocating for:

“Managed Retreat”

Due to high cost of repetitive nourishments

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ASR Solution: “Managed Advance” Utilize Multi-Purpose Reefs to:

• Push Threatened Coastlines Seaward

• Retain Beach Sediment

• Enhance Ecological Amenities

• Enhance Recreational Amenities

• Enhance Economic Growth Narrowneck Multi-Purpose Reef, Gold Coast, Australia

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Multi-Purpose Reefs: The Environmentally Sensitive Future of Coastal Protection

Coastal Protection

Ecological Enhancement

Enhanced Recreational Amenities

Economic Growth

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Multi-Purpose Reefs: A technology inspired by Nature

Nature’s way

Offshore reefs naturally protect

the coast

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Multi-Purpose Reef Schematic

Reef

Navigation - Mooring BuoysFishing / Diving

Salient

Original Shoreline

SurfingDiving

Calm Swimming

ZoneSurfing / Fishing Surfing / Fishing

Longshore flowLongshore flow

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ASR Multi-Purpose Reef Projects:

Construction CompleteDesign Phase

India

Australia

Ventura, CA

UK

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ObjectivesWiden the beach and dunes along Surfers Paradise Esplanade

Improve the surfing climate at NarrowneckCost:Benefit 1:60-1:80 (Raybould and Mules, 1998)

Narrowneck Multi-Purpose Reef – Australia

Findings after 10 years of monitoring by University of New South Wales using ARGUS Coastal Monitoring System:

Beach width was same in 2008 as it was at the completion of reef project in 2001

Salient

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Boscombe Multi-Purpose Reef, UK

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Boscombe Pier, 2006

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Boscombe Reef Construction

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Boscombe Reef Construction

Total Volume = 13,000 m3

100 m

50 m

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Boscombe Reef – Coastal Protection

Completed Summer 2009

Seaw all

Baseline of beach

Pre-Construction April 7, 2007March 22, 2010

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Boscombe Reef – Coastal Protection

Boscombe Reef (low tide)

Salient Formation (March 2010)

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Boscombe Reef – Surfing Enhancement

Wave Breaking on Laboratory Model Wave Breaking on Reef

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Boscombe Reef – Surfing Enhancement

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Boscombe Reef: Ecological EnhancementHard stable substrate promotes greater biodiversity than sandy bottom

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Boscombe Reef - Economic Enhancement

Media coverage of the Boscombe Reef Project generated over (US $20 million) in free publicity for the region.

(Bournemouth Borough Council, UK, 2009)

Project Benefit to Cost Ratio Estimate

20:1

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Kovalam Reef, IndiaKovalam Beach, 2009

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Kovalam Reef – Site Specific SolutionMulti-Purpose Reef attached to the Southern Headland

Single Layer of 28 Geotextile Sand Filled Containers

38 m

110 m

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Kovalam Reef: Completed February 2010Total Volume =

4100 m3

110m

38m

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Kovalam Reef – Coastal Protection

September 2009 August 2010

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Kovalam Reef – Coastal Protection

First year of Kovalam reef monitoring revealed a stable beach profile

cycle.

March 2010

September 2010

March 2011

September 2009

POST-REEF

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Kovalam Reef – Ecological EnhancementColonisation by marine organisms started only 2 weeks after

completion of the reef.

1 year later, a large variety of marine life inhabits the reef.

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Kovalam Reef – Surfing Enhancement

Click to play video

Kovalam reef has received extensive praise for high quality surfing waves, and has been featured by surf companies including Patagonia, Surfline, and Quiksilver.

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Multi-Purpose Reefs - Video