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ASR UNDERSTAND, INNOVATE, SUSTAIN
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
ASR UNDERSTAND, INNOVATE, SUSTAIN
Multi-Purpose Reefs for Coastal Protection and Amenity Enhancement
An Innovative and Sustainable Solution to Address Coastal Erosion
Boscombe Multi-Purpose Reef, UK
ASR UNDERSTAND, INNOVATE, SUSTAIN
Challenge Loss of Beaches and Coastal Infrastructure
Loss of Economic and Recreational Resources
Significant Problem for Coastal Communities Worldwide.
Cape San Blas, FL 2004
ASR UNDERSTAND, INNOVATE, SUSTAIN
Traditional Coastal Protection Solutions
• Seawalls• Groins/Jetties• Emergent Breakwaters• Beach Nourishment
ASR UNDERSTAND, INNOVATE, SUSTAIN
Seawalls
• Accelerate erosion of beach
• Only protect upland structures
• A ‘last line of defense’
Wave Energy In
Wave Energy Reflected
South Palm Beach, FL
ASR UNDERSTAND, INNOVATE, SUSTAIN
Groins and Jetties
Move Problem Down the Beach
New Jersey
Sediment
Boynton Inlet, FL
Sediment
ASR UNDERSTAND, INNOVATE, SUSTAIN
Emergent Breakwaters
• Tombolos inhibit natural flow of sand
• May cause downstream erosion
• Negative aesthetic appeal
32nd Street, Miami, FL
ASR UNDERSTAND, INNOVATE, SUSTAIN
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
ASR UNDERSTAND, INNOVATE, SUSTAIN
Beach Nourishment and Restoration
Many stakeholders are advocating for:
“Managed Retreat”
Due to high cost of repetitive nourishments
ASR UNDERSTAND, INNOVATE, SUSTAIN
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
ASR UNDERSTAND, INNOVATE, SUSTAIN
Multi-Purpose Reefs: The Environmentally Sensitive Future of Coastal Protection
Coastal Protection
Ecological Enhancement
Enhanced Recreational Amenities
Economic Growth
ASR UNDERSTAND, INNOVATE, SUSTAIN
Multi-Purpose Reefs: A technology inspired by Nature
Nature’s way
Offshore reefs naturally protect
the coast
ASR UNDERSTAND, INNOVATE, SUSTAIN
Multi-Purpose Reef Schematic
Reef
Navigation - Mooring BuoysFishing / Diving
Salient
Original Shoreline
SurfingDiving
Calm Swimming
ZoneSurfing / Fishing Surfing / Fishing
Longshore flowLongshore flow
ASR UNDERSTAND, INNOVATE, SUSTAIN
ASR Multi-Purpose Reef Projects:
Construction CompleteDesign Phase
India
Australia
Ventura, CA
UK
ASR UNDERSTAND, INNOVATE, SUSTAIN
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
ASR UNDERSTAND, INNOVATE, SUSTAIN
Boscombe Multi-Purpose Reef, UK
ASR UNDERSTAND, INNOVATE, SUSTAIN
Boscombe Pier, 2006
ASR UNDERSTAND, INNOVATE, SUSTAIN
Boscombe Reef Construction
ASR UNDERSTAND, INNOVATE, SUSTAIN
Boscombe Reef Construction
Total Volume = 13,000 m3
100 m
50 m
ASR UNDERSTAND, INNOVATE, SUSTAIN
Boscombe Reef – Coastal Protection
Completed Summer 2009
Seaw all
Baseline of beach
Pre-Construction April 7, 2007March 22, 2010
ASR UNDERSTAND, INNOVATE, SUSTAIN
Boscombe Reef – Coastal Protection
Boscombe Reef (low tide)
Salient Formation (March 2010)
ASR UNDERSTAND, INNOVATE, SUSTAIN
Boscombe Reef – Surfing Enhancement
Wave Breaking on Laboratory Model Wave Breaking on Reef
ASR UNDERSTAND, INNOVATE, SUSTAIN
Boscombe Reef – Surfing Enhancement
ASR UNDERSTAND, INNOVATE, SUSTAIN
Boscombe Reef: Ecological EnhancementHard stable substrate promotes greater biodiversity than sandy bottom
ASR UNDERSTAND, INNOVATE, SUSTAIN
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
ASR UNDERSTAND, INNOVATE, SUSTAIN
Kovalam Reef, IndiaKovalam Beach, 2009
ASR UNDERSTAND, INNOVATE, SUSTAIN
Kovalam Reef – Site Specific SolutionMulti-Purpose Reef attached to the Southern Headland
Single Layer of 28 Geotextile Sand Filled Containers
38 m
110 m
ASR UNDERSTAND, INNOVATE, SUSTAIN
Kovalam Reef: Completed February 2010Total Volume =
4100 m3
110m
38m
ASR UNDERSTAND, INNOVATE, SUSTAIN
Kovalam Reef – Coastal Protection
September 2009 August 2010
ASR UNDERSTAND, INNOVATE, SUSTAIN
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
ASR UNDERSTAND, INNOVATE, SUSTAIN
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.
ASR UNDERSTAND, INNOVATE, SUSTAIN
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.
ASR UNDERSTAND, INNOVATE, SUSTAIN
Multi-Purpose Reefs - Video