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词条 Artificial reef
释义

  1. History

  2. Development

     Electro-mineral accretion  Artificial surfing reefs 

  3. Environmental concerns

     Fish-attracting device  Recreational dive sites  Potential sources of pollution 

  4. Erosion prevention

  5. Examples

     Florida  Osborne Reef  Neptune Reef  Ex-USS Massachusetts  Ex-USS Oriskany  Ex-USNS Hoyt S. Vandenberg  Ex-USS Spiegel Grove  North Carolina  Ex-USS Yancey  Ex-USCGC Spar  Ex-USS Indra  Ex-USS Aeolus  Delaware  Redbird Reef  Mexico  Cancun Underwater Museum  Australia  Gibraltar  India  Temple Reef  Dubai  Philippines 

  6. See also

  7. References

  8. External links

{{short description|A man-made underwater structure, typically built to promote marine life, control erosion, block ship passage, block the use of trawling nets, or improve surfing}}

An artificial reef is a man-made underwater structure, typically built to promote marine life in areas with a generally featureless bottom, to control erosion, block ship passage, block the use of trawling nets,[2] or improve surfing.

Many reefs are built using objects that were built for other purposes, for example by sinking oil rigs (through the Rigs-to-Reefs program), scuttling ships, or by deploying rubble or construction debris. Other artificial reefs are purpose built (e.g. the reef balls) from PVC or concrete. Shipwrecks may become artificial reefs when preserved on the sea floor. Regardless of construction method, artificial reefs generally provide hard surfaces where algae and invertebrates such as barnacles, corals, and oysters attach; the accumulation of attached marine life in turn provides intricate structure and food for assemblages of fish.

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History

The construction of artificial reefs began in ancient times. Persians blocked the mouth of the Tigris River to thwart Indian pirates by building an artificial reef[3] and during the First Punic War the Romans built a reef across the mouth of the Carthaginian harbor in Sicily to trap enemy ships within[4] and assist in driving the Carthaginians from the island.

Artificial reefs to increase fish yields or for algaculture began no later than 17th-century Japan, when rubble and rocks were used to grow kelp.[5] The earliest recorded artificial reef in the United States is from the 1830s, when logs from huts were used off the coast of South Carolina to improve fishing.[6]

Beginning before the 1840s, US fishermen used interlaced logs to build artificial reefs. More recently, refuse such as old refrigerators, shopping carts, ditched cars and out-of-service vending machines replaced the logs in ad hoc reefs. Officially sanctioned projects have incorporated decommissioned ships, subway cars, battle tanks, armored personnel carriers, oil drilling rigs and beehive-like reef balls.[7]

In 2018, the world's largest 3D-printed artificial reef was introduced in the Maldives, in an aim to protect coral reefs from the ravages of climate change and warming waters.{{cn|date=March 2019}}

Development

Artificial reefs tend to develop in more or less predictable stages. First, where an ocean current encounters a vertical structure, it can create a plankton-rich upwelling that provides a reliable feeding spot for small fish such as sardines and minnows, which draw in pelagic predators such as tuna and sharks. Next come creatures seeking protection from the ocean's lethal openness—hole and crevice dwellers such as grouper, snapper, squirrelfish, eels and triggerfish. Opportunistic predators such as jack and barracuda also appear. Over months and years the reef structure becomes encrusted with algae, tunicates, hard and soft corals and sponges.[7]

Electro-mineral accretion

Electro-mineral accretion (EMA), also known as Biorock, involves applying a low voltage current to a metallic structure to cause limestone to crystallize on the surface, to which coral planulae can attach and grow. The electric current also speeds post-attachment growth.[9]

EMA works like charging a battery with a positive pole, the cathode, and a negative pole, the anode. Applying electric current attracts dissolved minerals to either the cathode or the anode. Chemical reactions take place at both poles. On the anode, bubbles of oxygen and chlorine gas form. These bubbles float to the surface and dissolve into the air. On the cathode, bubbles of hydrogen gas and a limestone precipitate appear.

The voltage is low enough that it can be generated by floating solar panels or from wave motion.

A coalition of scientists named the Global Coral Reef Alliance (GCRA) developed and patented[7] the technique called the Biorock Process using mineral accretion for reef restoration, mariculture and shoreline protection.[8]

Artificial surfing reefs

Artificial surfing reefs have been created in several locations. Supporters cite benefits such as coastal protection, habitat enhancement and coastal research. The world's first attempt was made in El Segundo, near Los Angeles, in California. The next attempt was at Mosman Beach, Perth, Western Australia. This reef was constructed of large granite rocks placed in a pyramidal shape to form an appropriate breaking wave form that would suit surfers. An artificial reef constructed of over 400 massive, geotextile bags (each larger than a bus) filled with sand was constructed in 2000 at Narrowneck on the Gold Coast of Queensland, Australia. This artificial reef had two objectives: stabilizing beach nourishment and improving surfing conditions.

Europe's first artificial reef was approved in 2008. Construction began August 30, 2008, in Boscombe, Bournemouth, UK (5 months after 3 local councillors spent 18 days in New Zealand on a fact-finding mission[9]), and opened in November 2009. The £3 million (2.5% of the Council's annual budget that year) reef was expected to create waves up to 30% larger and double the number of surfing days annually. Construction on this reef continued from June 2008 through August 2009.[10] Boscombe Reef was built from large sand-filled geotextile containers, totaling {{convert|13,000|m3|ft3}}. It failed entirely and attempts were made to convert it into a multi purpose reef, which also failed. Bournemouth Council attempted to recover monies from the New Zealand-based reef construction company but the company went into administration before paying any compensation.

In the United States coastal permitting requirements present major obstacles to building surfing reefs. The only reef built in the U.S. for surfing is southern California's "Pratte's Reef", which was constructed in 2000 and removed in 2008 as planned.[11]

Environmental concerns

According to environmental group The Ocean Conservancy, the Osborne Reef may be an indication that the benefits of artificial reefs need to be re-examined. Jack Sobel, a senior scientist at the group, stated "There's little evidence that artificial reefs have a net benefit," citing concerns such as toxicity from paint, plastics parts, etc., damage to ecosystems and concentrating fish into one place (worsening overfishing).[12]

Fish-attracting device

Artificial reefs can show quick increases in local fish population rehabilitation, coral reef and algae growth. However, far more than half the amount of biomass found on artificial reefs is attracted from other areas rather than developing there. James Bohnsack, a biologist with the National Marine Fisheries Service (NMFS) concluded artificial reefs do not increase fish populations. Instead they operate as fish aggregating devices (FADs) bringing in fish from other reefs. Concentrating fish on a reef also makes for easier fishing. Research continues.[13]

The fish attracted to artificial reef zones vary from reef to reef depending on its age, size and structure. Large reef structures such as large sunken ships attract larger fish.

The use of shipwrecks in rocky zones creates a new trophic structure for the local ecosystem. They become the home for certain species and many nearby animals migrate to the shipwreck. This unbalances the natural ecosystem and alters many other habitats.[14]

Recreational dive sites

Thousands of popular wreck diving sites throughout the world are built around shipwrecks sunk as artificial reefs.[15] Some of these wrecks were sunk deliberately to attract divers. The {{USS|Spiegel Grove}} and {{USS|Oriskany|CV-34|6}} in Florida, {{USS|Indra|ARL-37|6}} and {{USS|Aeolus|ARC-3|6}} in North Carolina, and {{ship||Bianca C|ship|2}} in Grenada draw thousands of divers annually.[16]

Potential sources of pollution

The materials used in most artificial reefs often cause pollution by releasing chemicals and nutrients that are not naturally found in reef environments. Ships can release polychlorinated biphenyls (PCBs), asbestos, iron, lead paint and anti-fouling paint leaches into the ocean and enters the food-chain.[17]

Old tires were used to create many artificial reefs. In Florida alone, 571 permitted artificial reefs exist, and the number of illegal reefs is thought to be much greater.[13] Tires are made from many chemicals and compounds such as black carbon, sulphur, zinc oxide and peroxides. The US National Artificial Reef Plan states that tires are a good reef construction material because no toxic substances are released from the decomposition of tires; though there is little information published to back up the claims and the future decomposing of the many different types of rubber tires could create unseen pollution.[18]

Tires have fallen out of favor with marine biologists. Tropical storms may demolish the tire containment system, washing tires onto beaches, destroying nearby coral reefs and inhibiting new coral growth.[19] As a result, states such as Florida and the country of France have begun large-scale removal of tire reefs.[20][21] On the Osborne Reef off the coast of Fort Lauderdale, Florida boaters were allowed to dump unsecured tires at the site. Storms broke the nylon straps holding the original tire bundles together. Since 2007 approximately 130,000 of an estimated 700,000 tires have been removed.[22] At other artificial reef sites hurricanes pushed tires up on beaches from Florida to North Carolina, damaging reefs, causing pollution and requiring costly cleanup.[23] As a result, the Ocean Conservancy now includes tire removal during the International Coastal Cleanup in September of each year.[24]

Erosion prevention

Some artificial reefs are used to prevent coastal erosion. They can be designed to act in multiple ways. Some are designed to force waves to deposit their energy offshore rather than directly on the coastline. Other reefs are designed to hold sediment on beaches. These reefs trap the sediment. These reefs are custom-designed for each unique zone.[25]

Examples

Florida

Florida is the site of many artificial reefs, many created from deliberately sunken ships, including Coast Guard cutters Duane and Bibb and the U.S. Navy landing ship Spiegel Grove.[26]

Osborne Reef

{{main article|Osborne Reef}}

In the early 1970s, more than 2,000,000 used vehicle tires were dumped off the coast of Fort Lauderdale, Florida to form an artificial reef. However, the tires were not properly secured to the reef structures, and ocean currents broke them loose, sending them crashing into the developing reef and its natural neighbors. As of 2009, fewer than 100,000 of the tires had been removed after more than 10 years of efforts.[27]

Neptune Reef

Neptune Memorial Reef was originally conceived as an art project that would gradually decay. Burial at sea became a way of financing the project. As of 2011, about 200 "placements" had occurred. Cremated remains are mixed with concrete and either encased in columns or molded into sea-star, brain-coral, {{convert|15|ft|m}} castings of lions or other shapes before entering the water.[26]

Ex-USS Massachusetts

In 1921 the US battleship {{USS|Massachusetts|BB-2|2}} was scuttled in shallow water off the coast of Pensacola, Florida and then used as a target for experimental artillery. In 1956 the ship was declared the property of the state of Florida by the Florida Supreme Court. Since 1993 the wreck has been a Florida Underwater Archaeological Preserve and is included in the National Register of Historic Places. She serves as an artificial reef and diving spot.

Ex-USS Oriskany

The world's largest artificial reef was created by the purposeful sinking of the 44,000 ton aircraft carrier {{USS|Oriskany|CV-34|6}} off the coast of Pensacola, Florida, in 2006.[28]

Ex-USNS Hoyt S. Vandenberg

The second-largest artificial reef is USNS Hoyt S. Vandenberg, a former World War II era troop transport that served as a spacecraft-tracking ship after the war. The Vandenberg was scuttled seven miles off Key West on May 27, 2009, in {{convert|140|ft|m}} of clear water.[29] Supporters expected the ship to draw recreational divers away from natural reefs, allowing those reefs to recover from damage from overuse.[30]

Ex-USS Spiegel Grove

The ex-USS {{USS|Spiegel Grove|LSD-32|2}} is located on Dixie Shoal, {{convert|6|mi|km}} off the Florida Keys in the Florida Keys National Marine Sanctuary. Her exact location is {{Coord|25|04|00.23|N|80|18|00.7|W |region:US_type:landmark |display=inline}}.

North Carolina

Ex-USS Yancey

{{USS|Yancey|AKA-93|6}} was sunk as an artificial reef off Morehead City, North Carolina, 1990. She is lying on her starboard side at a depth of {{convert|160|ft|m|abbr=on}}

Ex-USCGC Spar

{{ship|USCGC|Spar|WLB-403|6}} was scuttled in October 2004 in {{convert|108|ft|m}} of water, {{convert|30|mi|km|0}} off Morehead City, North Carolina, where she serves as an artificial reef.[31]

Ex-USS Indra

{{USS|Indra|ARL-37|6}} was sunk as an artificial reef, 4 August 1992 in {{convert|60|ft|m}} of water.
Its coordinates are {{Coord|34|33|55|N|76|58|30|W|type:landmark|display=inline,title}}.[32]

Ex-USS Aeolus

{{USS|Aeolus|ARC-3|6}} was sunk to form an artificial reef in August 1988. The ex-Aeolus, located about 22 miles from Beaufort Inlet in {{convert|110|ft|-1}} of water, is regularly visited by divers.

Delaware

Redbird Reef

{{main article|Redbird Reef}}

In late 2000, the MTA New York City Transit decided to retire an outdated fleet of subway cars to make room for new R142 and R142A trains. The obsolete subway cars, (nicknamed "Redbirds"), had run on the IRT lines in the New York City Subway system for 40 years. Each car was stripped, decontaminated, loaded on a barge, and sunk in the Atlantic Ocean off the coast of Delaware. Some cars had number plates removed because of rust, which were then auctioned off on eBay. A total of 1200 subway cars were sunk for this project.

In September 2007, the MTA approved a further contract worth $6 million{{Citation needed|date=May 2009}}, to send 1600 of its retired subway cars to be used as artificial reefs. The old models were sheathed in stainless steel, except for the plastic front ends, which were removed before sinking. The retired fleet included old work trains and cars damaged beyond repair.

Mexico

Cancun Underwater Museum

Since November 2009, artist Jason deCaires Taylor has created more than 400 life size sculptures off the coast of Cancun, Mexico at the Cancun Underwater Museum. The coral reefs in this region suffered heavy degradation due to repetitive hurricane abuse. This project was funded by The National Marine Park and the Cancun Nautical Association. It was designed to emulate coral reefs using a neutral ph clay. Taylor constructed unique settings depicting daily activities ranging from a man watching TV to a 1970s replica of a Volkswagen Beetle. This artificial reef relieved pressure from the nearby Manchones Reef.[33]

Australia

Since the late 1990s, the Australian government has been providing decommissioned warships for use as artificial reefs for recreational scuba diving. So far, seven ships have been sunk:

  • {{HMAS|Swan|DE 50|6}} at Dunsborough in Western Australia during December 1997.[34]
  • {{HMAS|Perth|D 38|6}} at Albany in Western Australia during November 2001.[35]
  • {{HMAS|Hobart|D 39|6}} in Yankalilla Bay in South Australia during November 2002.[36]
  • {{HMAS|Brisbane|D 41|6}} off the Sunshine Coast in Queensland during July 2005.[37]
  • {{HMAS|Canberra|FFG 02|6}} at a site west of the entrance to Port Phillip Bay in Victoria during October 2009.[38]
  • {{HMAS|Adelaide|FFG 01|6}} off Terrigal on the New South Wales Central Coast during April 2011
  • {{HMAS|Tobruk|L 50|6}} off Hervey Bay on the Queensland Coast on 29th June 2018 [39]

Gibraltar

The Gibraltar Reef was first proposed by Eric Shaw in 1973. Initial experiments with tires proved unsuccessful as the tires were swept away by currents or buried underneath sand. In 1974, boats from local marinas and the Gibraltar Port Authority were donated. The first two were barges that were sunk in Camp Bay. In 2006, a 65-ton wooden boat, True Joy (also referred to as Noah's Ark) was sunk there as well, followed by {{MV|New Flame}}, a mid-sized bulk carrier, in 2007.

In 2013, more than 70 concrete blocks were sunk, each one square meter in size with protruding metal bars. This led to heated debate between the United Kingdom and Spain, with Gibraltar accusing Spain of over forty incursions into their waters per month[40] and Spain accusing Gibraltar of including metal bars in the reef to stop Spanish fishermen trawling the seabed for fish. The dropping led to a diplomatic conflict between the two countries because Gibraltar was a British Overseas Territory.

India

Temple Reef

The surfing reef Temple reef is off the coast of Pondicherry, India constructed of fully recycled materials such as concrete, rocks, trees, palms, and iron bars. It is located at a depth of {{convert|18|m|ft}}.

Dubai

Pearl of Dubai is an art-inspired Lost City off the coast of Dubai. The site encompasses five acres and is located at the World Islands. At a depth of {{convert|10|to|20|m|ft}}, the site is designed as an ancient lost city, complete with temples and statues using regional design cues from 800 BC.[41]

Philippines

Underwater Chocolate Hills is an artificial reef project undertaken by Spindrift Reefs Dive Center[42] off the coast of Panglao Island in the Philippines. It consists of broken coral harvested by local divers, who attach it to wire structures. The structures are built in the same shape as the Chocolate Hills, which can be found in the Bohol Region. The intent is to create a new dive site and new marine habitat.

See also

  • Artificial reefs in Japan
  • Artificial Reef Society of British Columbia
  • Artificial wave
  • Biorock
  • Fish aggregating device
  • Marine debris
  • Multi-purpose reef
  • Scuttling
  • Ship graveyard
  • Sinking ships for wreck diving sites
  • Spawning bed
  • Underwater sculptures

References

1. ^[https://www.theguardian.com/science/blog/2016/sep/20/from-concrete-to-coral-breeze-blocks-make-a-splash-regenerating-reefs From concrete to coral: breeze blocks make a splash regenerating reefs]
2. ^[https://asia.nikkei.com/Life-Arts/Life/Cambodia-volunteers-step-up-battle-against-illegal-fishing Cambodia volunteers step up battle against illegal fishing]
3. ^{{cite book|first=Thomas Wayne |last=Williams |title=A Case Study of Artificial Reef Decision-Making in the Florida Keys |publisher=Virginia Commonwealth University |url=http://etd.vcu.edu/theses/available/etd-08042006-093035/unrestricted/williamstw_phd.pdf |format=pdf |accessdate=20 December 2006 |deadurl=yes |archiveurl=https://web.archive.org/web/20080530102045/http://etd.vcu.edu/theses/available/etd-08042006-093035/unrestricted/williamstw_phd.pdf |archivedate=30 May 2008 }}
4. ^{{cite web|first1=Ron |last1=Hess |first2=Denis |last2=Rushworth |first3=Michael V. |last3=Hynes |first4=John E. |last4=Peters |title=Disposal Options for Ships |publisher=Rand Corporation |url=http://192.5.14.110/pubs/monograph_reports/MR1377/MR1377.ch5.pdf |format=pdf |accessdate=20 December 2006 |deadurl=yes |archiveurl=https://web.archive.org/web/20070629110318/http://192.5.14.110/pubs/monograph_reports/MR1377/MR1377.ch5.pdf |archivedate=June 29, 2007}}
5. ^{{cite web|title=Fisheries Technologies for Developing Countries |publisher=National Academies Press |url=http://www.nap.edu/nap-cgi/skimit.cgi?recid=1024&chap=85-114 |accessdate=20 December 2006}} {{dead link|date=April 2015}}
6. ^{{Cite web|publisher=Gulf States Marine Fisheries Commission |title=Guidelines For Marine Artificial Reef Materials |url=http://www.gsmfc.org/pubs/SFRP/Guidelines_for_Marine_Artificial_Reef_Materials_January_1997.pdf |format=pdf |accessdate=20 December 2006 |deadurl=yes |archiveurl=https://web.archive.org/web/20070110005135/http://www.gsmfc.org/pubs/SFRP/Guidelines_for_Marine_Artificial_Reef_Materials_January_1997.pdf |archivedate=January 10, 2007 }}
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8. ^1 {{cite web|url=http://www.globalcoral.org/wp-content/uploads/2013/11/BIOROCK_TECHNOLOGY_july1114.pdf |publisher=Global Coral Reef Alliance |title=Biorock Benefits |format=pdf |date=July 2014 |accessdate=5 April 2015}}
9. ^{{Cite news|first = First|last = Last|title = Council officers surf reef fact-finding mission Down Under cost £8,429|url = http://www.bournemouthecho.co.uk/news/3753513.Council_officers_surf_reef_fact_finding_mission_Down_Under_cost___8_429/?ref=arc|work = Bournemouth Echo|date = 2008-10-14|accessdate = 2012-03-05}}
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11. ^{{Cite news|first = Evan|last = Fontaine|title = SANDBAGGED After years of unspectacular closeouts, Pratte's Reef is removed from El Segundo|url = http://www.surfline.com/surf-news/after-years-of-unspectacular-closeouts-prattes-reef-is-removed-from-el-segundo-sandbagged_19261/|work = Surfline|date = 2008-10-11|accessdate = 2012-03-05}}
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15. ^{{cite web|title=Wrecks and Obstructions Database|url=http://www.nauticalcharts.noaa.gov/hsd/wrecks_and_obstructions.html|website=NOAA}}
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19. ^{{cite news|last1=Allen|first1=Greg|title=Fallout from Bad '70s Idea: Auto Tires in Ocean Reef|url=https://www.npr.org/templates/story/story.php?storyId=11462066|accessdate=8 March 2016|publisher=NPR|date=5 July 2007}}
20. ^{{cite news|last1=Fleshler|first1=David|title=Fixing a catastrophe: Divers removing 90,000 tires from ocean|url=http://www.sun-sentinel.com/local/broward/fl-tire-removal-20150514-story.html|accessdate=8 March 2016|publisher=Sun Sentinel|date=15 May 2015}}
21. ^{{cite news|last1=Ferrer|first1=Sandra|title=France hits reverse on sinking tyres for artificial reefs|url=http://phys.org/news/2015-05-france-reverse-tyres-artificial-reefs.html|accessdate=8 March 2016|publisher=Phys.org|date=22 May 2015}}
22. ^{{cite news|last1=Fleshler|first1=David|title=Push is on to remove thousands of tires on ocean floor in Fort Lauderdale|url=http://www.sun-sentinel.com/local/broward/fl-ocean-tire-removal-20160630-story.html|accessdate=4 July 2016|publisher=Sun Sentinel|date=30 June 2016}}
23. ^{{cite web|title=The Osborne Tire Reef|url=http://www.projectbaseline.org/gulfstream/project-baseline-gulfstream-projects/the-osborne-tire-reef/|website=projectbaseline.org|publisher=Project Baseline|accessdate=14 March 2016|deadurl=yes|archiveurl=https://web.archive.org/web/20160314214913/http://www.projectbaseline.org/gulfstream/project-baseline-gulfstream-projects/the-osborne-tire-reef/|archivedate=14 March 2016|df=}}
24. ^{{cite web|last1=Gaskill|first1=Melissa|title=Scuba Divers Left Picking Up Pieces After Tire Artificial Reef Projects Fail|url=http://www.sportdiver.com/scuba-diving-rubber-tire-artificial-reefs-france-florida|website=sportdiver.com|accessdate=28 May 2016}}
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27. ^{{cite news|title=Florida tire reef removal ends for the year |first=Jim |last=Peppard |url=http://www.wtsp.com/news/mostpop/story.aspx?storyid=111967&provider=top |publisher=WTSP |location=St. Petersburg, Florida |date=21 August 2009 |accessdate=5 April 2015 |archiveurl=https://www.webcitation.org/5uenyZyK1?url=http://www.wtsp.com/news/mostpop/story.aspx?storyid=111967&provider=top |archivedate=1 December 2010 |deadurl=yes }}
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29. ^{{cite web|url=http://my.att.net/s/editorial.dll?fromspage=cg/news/ne_details.htm&eeid=6592684&eetype=article&render=y&ch=ne&s=na |title=WWII-era ship becomes sunken reef off Key West |work=AT&T Online News |date=27 May 2009 |accessdate=18 July 2009}} {{dead link|date=April 2015}}
30. ^{{cite news |url=https://www.nytimes.com/aponline/2009/05/25/us/AP-US-Sinking-The-Vandenberg.html |title=Ship to Become 2nd Largest Intentional Reef |agency=Associated Press |work=New York Times |date=25 May 2009 |accessdate=25 May 2009}} {{dead link|date=April 2015}}
31. ^{{cite web|last1=Hudy|first1=Paul|title=North Carolina Shipwrecks|url=http://www.nc-wreckdiving.com/shipwrecks.html|website=nc-wreckdiving.com|accessdate=15 July 2015}}
32. ^{{cite web|author=Mobile Riverine Force Association |title=History of The USS Indra (ARL-37) |url=http://www.mrfa.org/arl-37.htm |date=October 4, 1999 |accessdate=October 20, 2014 |deadurl=yes |archiveurl=https://web.archive.org/web/20150223025710/http://www.mrfa.org/arl-37.htm |archivedate=February 23, 2015 }}
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34. ^{{cite web|title=HMAS Swan - History |url=http://www.michaelmcfadyenscuba.info/viewpage.php?page_id=454 |publisher=Michael McFayden's Scuba Diving Web Site |accessdate=5 April 2015}}
35. ^{{cite web|title=Welcome to the official former HMAS Perth Website |url=http://www.hmasperth.com.au/ |accessdate=12 July 2012 |deadurl=yes |archiveurl=https://web.archive.org/web/20120320234914/http://www.hmasperth.com.au/ |archivedate=March 20, 2012 }}
36. ^{{cite web|title=Dive the Ex-HMAS Hobart |url=http://www.exhmashobart.com.au/index.html |accessdate=5 April 2015 |deadurl=yes |archiveurl=https://web.archive.org/web/20150227163904/http://www.exhmashobart.com.au/index.html |archivedate=27 February 2015 |df= }}
37. ^{{cite web|title=Ex-HMAS Brisbane Conservation Park |url=http://www.derm.qld.gov.au/parks/ex-hmas-brisbane/index.html |accessdate=12 July 2012 |deadurl=yes |archiveurl=https://web.archive.org/web/20120511025943/http://www.derm.qld.gov.au/parks/ex-hmas-brisbane/index.html |archivedate=May 11, 2012 }}
38. ^{{cite web|title=ex-HMAS Canberra Reef |url=http://www.hmascanberra.com.au/ |publisher=Dive the ex-HMAS Canberra |accessdate=5 April 2015}}
39. ^{{cite web|title=Ex-HMAS Tobruk scuttled off the Queensland coast to become dive wreck |url=http://www.abc.net.au/news/2018-06-29/ex-hmas-tobruk-scuttled-off-the-queensland-coast/9923758 |publisher=ABC |accessdate=29 June 2018}}
40. ^{{cite web|url=http://www.express.co.uk/news/world/443937/GIBRALTAR-We-are-just-one-shot-away-from-military-conflict-warns-MP-amid-new-standoff |title=Gibraltar: We are just one shot away from military conflict, warns MP amid new standoff |work=Daily Express |last=Bennett |first=Owen |date=19 November 2013 |accessdate=5 April 2015}}
41. ^{{cite news|url=https://www.telegraph.co.uk/travel/destinations/middleeast/dubai/10937905/The-worlds-largest-underwater-theme-park-planned-in-Dubai.html |title=The world’s largest underwater theme park planned in Dubai |work=The Telegraph |last=Kim |first=Soo |date=1 July 2014 |accessdate=5 April 2015}}
42. ^{{cite web|title=Spindrift Reefs Dive Center|url=http://spindriftreefs.com|deadurl=yes|archiveurl=https://web.archive.org/web/20160109035147/http://spindriftreefs.com/|archivedate=2016-01-09|df=}}

External links

  • Eastern Carolina Artificial Reef Association
  • Organization for Artificial Reefs
  • Florida Artificial Reef Program
  • Reef Ball Foundation
  • {{Cite web|url=http://artificialreefsocietybc.ca|title=Artificial Reef Society of BC|website=Artificial Reefs ARSBC|access-date=2017-10-05}}
{{coastal management}}{{DEFAULTSORT:Artificial Reef}}

3 : Artificial reefs|Ship disposal|Recreational diving
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