167 multi purpose-reefs_final
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This document discusses multi-purpose reefs as an innovative solution for coastal protection, erosion control, and amenity enhancement. It provides examples of successful reef projects in Australia, the UK, and India that have widened beaches, improved surfing conditions, and promoted ecological diversity while providing coastal protection at a lower cost than traditional approaches like seawalls or beach nourishment. Monitoring of these reefs has shown they can effectively protect coastlines from erosion over many years while enhancing recreation and the environment.
167 multi purpose-reefs_final
- 1. 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
- 2. ASRUNDERSTAND, 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
- 3. ASRUNDERSTAND, 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
- 4. ASRUNDERSTAND, INNOVATE, SUSTAIN Traditional Coastal Protection Solutions • Seawalls • Groins/Jetties • Emergent Breakwaters • Beach Nourishment
- 5. ASRUNDERSTAND, 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
- 6. ASRUNDERSTAND, INNOVATE, SUSTAIN Groins and Jetties Move Problem Down the Beach New Jersey Sedimen t Boynton Inlet, FL Sediment
- 7. ASRUNDERSTAND, INNOVATE, SUSTAIN Emergent Breakwaters • Tombolos inhibit natural flow of sand • May cause downstream erosion • Negative aesthetic appeal 32nd Street, Miami, FL
- 8. ASRUNDERSTAND, 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 Mile St. Augustine, FL
- 9. ASRUNDERSTAND, INNOVATE, SUSTAIN Beach Nourishment and Restoration Many stakeholders are advocating for: “Managed Retreat” Due to high cost of repetitive nourishments
- 10. ASRUNDERSTAND, 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
- 11. ASRUNDERSTAND, INNOVATE, SUSTAIN Multi-Purpose Reefs: The Environmentally Sensitive Future of Coastal Protection Coastal Protection Ecological Enhancement Enhanced Recreational Amenities Economic Growth
- 12. ASRUNDERSTAND, INNOVATE, SUSTAIN Multi-Purpose Reefs: A technology inspired by Nature Nature’s way Offshore reefs naturally protect the coast
- 13. ASRUNDERSTAND, INNOVATE, SUSTAIN Multi-Purpose Reef Schematic Reef Navigation - Mooring Buoys Fishing / Diving Salient Original Shoreline Surfing Diving Calm Swimming Zone Surfing / Fishing Surfing / Fishing Longshore flowLongshore flow
- 14. ASRUNDERSTAND, INNOVATE, SUSTAIN ASR Multi-Purpose Reef Projects: Construction Complete Design Phase India Australia Ventura, CA UK
- 15. ASRUNDERSTAND, INNOVATE, SUSTAIN Objectives Widen the beach and dunes along Surfers Paradise Esplanade Improve the surfing climate at Narrowneck Cost: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
- 16. ASRUNDERSTAND, INNOVATE, SUSTAIN Boscombe Multi-Purpose Reef, UK
- 18. ASRUNDERSTAND, INNOVATE, SUSTAIN Boscombe Reef Construction
- 19. ASRUNDERSTAND, INNOVATE, SUSTAIN Boscombe Reef Construction Total Volume = 13,000 m3 50 m
- 20. ASRUNDERSTAND, INNOVATE, SUSTAIN Boscombe Reef – Coastal Protection Completed Summer 2009 Pre-Construction April 7, 2007 March 22, 2010
- 21. ASRUNDERSTAND, INNOVATE, SUSTAIN Boscombe Reef – Coastal Protection Boscombe Reef (low tide) Salient Formation (March 2010)
- 22. ASRUNDERSTAND, INNOVATE, SUSTAIN Boscombe Reef – Surfing Enhancement Wave Breaking on Laboratory Model Wave Breaking on Reef
- 23. ASRUNDERSTAND, INNOVATE, SUSTAIN Boscombe Reef – Surfing Enhancement
- 24. ASRUNDERSTAND, INNOVATE, SUSTAIN Boscombe Reef: Ecological Enhancement Hard stable substrate promotes greater biodiversity than sandy bottom
- 25. ASRUNDERSTAND, INNOVATE, SUSTAIN Boscombe Reef - Economic Enhancement Media coverage of the Boscombe Reef Project generated over (US $20 million) in free publicity for the region. Project Benefit to Cost Ratio Estimate 20:1
- 26. ASRUNDERSTAND, INNOVATE, SUSTAIN Kovalam Reef, India Kovalam Beach, 2009
- 27. ASRUNDERSTAND, INNOVATE, SUSTAIN Kovalam Reef – Site Specific Solution Multi-Purpose Reef attached to the Southern Headland Single Layer of 28 Geotextile Sand Filled Containers 38 m 110 m
- 28. ASRUNDERSTAND, INNOVATE, SUSTAIN Kovalam Reef: Completed February 2010 Total Volume = 4100 m3 38 m
- 29. ASRUNDERSTAND, INNOVATE, SUSTAIN Kovalam Reef – Coastal Protection September 2009 August 2010
- 30. ASRUNDERSTAND, 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
- 31. ASRUNDERSTAND, INNOVATE, SUSTAIN Kovalam Reef – Ecological Enhancement Colonisation by marine organisms started only 2 weeks after completion of the reef. 1 year later, a large variety of marine life inhabits the reef.
- 32. ASRUNDERSTAND, 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.
- 33. ASRUNDERSTAND, INNOVATE, SUSTAIN Multi-Purpose Reefs - Video