Reef rehabilitation across the globe

Discussion in 'Diving, Collecting and Environmental Discussions' started by viper357, 7 Jul 2007.

  1. viper357

    viper357 Admin MASA Contributor

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  3. KevinW

    KevinW

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    Hi Viper,

    Very interesting link!

    Has anyone heard of the South African Underwater Ecology Society? The email address given bounces and the links on DEAT's site also no longer function.
     
  4. Galibore

    Galibore Retired Moderator

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    Yes I saw a documentary on them long ago. Very interesting work being done.
     
  5. Carl

    Carl

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    Hi Guys

    Check out this for the rehab and construction of new reefs

    http://www.globalcoral.org/photo_galleries.htm

    To do this in our confined tanks appears to be a no-no as the processes leaches chlorine gass and some bad acids but. I spent hours surfing on this last night and even traced the patent, to start we need to look at this, imagine do this at Vetchs pier.

    Carl
     
  6. Rod

    Rod

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    Reef Balls

    I spoke to Don Hourahane (he lives/lived in Roodepoort) some years ago, he spoke of a project in New Zealand. As far as I know nothing came of it. The materials used, are apart from the roving, are the same as many of us are using to make artificial live rock, namely cement and some form of calcium carbonate or aragonite.
    I did see a program where the Americans were spending millions of dollars removing the "artificial reefs" made of old tyres which are causing an ecological disaster on the Florida Keys.
     
  7. Galibore

    Galibore Retired Moderator

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    I recently saw a program on a society also creating artificial reefs from plain old iron bar. I think there is a thread here on MASA about it.

    Within a couple of weeks the iron is covered in coralline and within a matter of two days the iron structures are teaming with shrimp, crabs, small fish and other crustaceans. It was amazing to see a structure made of rebar go from nothing to a full blown reef with SPS, anemones and lots of other life.
     
  8. Carl

    Carl

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    Hi Rod

    Good to see you here.

    This form of artficial reef is using a metal frame with some low voltage DC trough it.

    It uses the mineral accretion, or the Biorock® Process, by Prof Wolf Hibertz.

    Copied from his website

    Mineral accretion technology is a method which uses safe, low voltage electrical currents through seawater, causing dissolved minerals to crystallize out on structures, growing into a white limestone similar to that which makes up coral reefs and tropical white sand beaches. This material has a strength similar to concrete. It can be used to make growing artificial reefs on which corals grow at very rapid rates because the change in the environment produced by electrical currents speed up formation and growth of both chemical limestone rock and the skeletons of corals and other shell-bearing organisms.

    Check his site:
    http://www.wolfhilbertz.com

    See you soon

    Carl
     
  9. phat

    phat

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    carl some nice studying there man!! very very interesting!!
     
  10. Carl

    Carl

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    Phat

    you guys on the sea can we come build areef for you

    Carl
     
  11. phat

    phat

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    with pleasure dud but slums water is to cold
     
  12. KevinW

    KevinW

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    One thing with artificial reef, or any other artificail habitat or rehabilitation programme, is that you never have any certainty about what the outcomes will be. For example, Vetch's Pier is an artificial reef that was constructed (albeit as a breakwater for the harbour) some 100 years ago. What is interesting is that Vetch's and Limestone (the natural reef that Vetch's links to) are reasonably similar but that the existing North breakwater at the harbour entrance is very different. The breakwater is constructed of rock that is very similar, if not the same as was used for Vetch's, and, whilst it is not as old as Vetch's reef, it is not nearly as species rich. Long and short of it is that there is more to creating reef than placing some structure into the sea.

    As an aside creating reef is all very well and good, but it does usually come at the expense of a perfectly good sand habitat with its own ecology.
     
  13. Rod

    Rod

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    Hi Carl that is really interesting. I see that the advantage doesn't last if the current is switched off. I would love to see someone try it in an aquarium. You checked out the patent?
     
  14. Carl

    Carl

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    Hi Rod

    Heres an abriefed version:

    Patent - 4,246,075, Hilbertz, W.H., Mineral accretion of large surface
    [SIZE=+1]structures, building components and elements[/SIZE]
    [SIZE=+0]Jan. 20, 1981.[/SIZE] Summary: Wolf Hilbertz' first patent on the process of seament
    production by electroaccretion. By topic heading:
    I. Background of the Invention - A very brief summary of the mineral
    content of ocean water and past attempts to utilize electrodeposition of
    minerals for corrosion protection of metallic marine structures.
    II. Summary of the Invention - A description of Hilbertz' proposal to
    use shaped metallic cathodes as accretion forms for the creation of
    building components. So far as electrical power requirements, he states
    that the: "...current may be of a density of up to 15000 mA/sq.ft. with
    an electric field potential between the electrodes of up to 30,000 volts."
    III. Detailed Description of the Invention
    IIIa. General Discussion - A description of the mineral content in ocean
    water and their use by living organisms. Non biological mineral
    extraction methods such as stalactite formation and electroaccretion are
    described in terms of the chemical and physical mechanisms. The
    results of X-ray diffraction analysis of sea water accreted material is
    given. The composition of the electroaccreted material in Hilbertz'
    experiments turned out to be mostly Mg(OH)2 with small amounts of
    calcium compounds.
    IIIb. Electrodeposition of Minerals onto Large Complex Surfaces as
    Structures - This section contains some descriptions of electroaccretion
    test runs. Steel mesh was used as the cathode material. Listed as
    possible anode materials were : "...iron, steel, lead, platinum,
    columbium..." A test was described where the voltage applied between
    the anode and the cathode was 6 volts and the current density 189
    mA/ft2. After an accretion time of 170 hours accretion thickness on
    the cathode material ranged from 2.5 cm to 2.3 mm. Hilbertz states the
    general rule that the slower the accretion rate, the stronger the resultant
    material. Phasing, the alternation of electrodeposition with biological
    accretion is described briefly. No claims were made so far as this
    producing materials with superior structural properties. The
    possibilities of having the cathode and anode alternate roles by
    reversing the electrical drive polarity was briefly described as a
    possibility without detailing any experimental data on this technique.
    IIIc. Specific Engineering and Architectural Applications - In this
    section Hilbertz describes a proposal for electroaccreting structures for
    OTECs, repairing them in place if they suffer damage and pumping
    water by electrolytic bubble lift.
    IIId. Advantages of Mineral Accretion Technology - The principle
    advantage claimed over conventional construction technology for
    marine applications is the ability to effect in-place repair of the
    structure.
    IV. Claims - three pages of legalese detailing the process of
    electroaccretion of structures in fluid electrolytes such as sea water.


    Carl
     
  15. Dober Man

    Dober Man

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    There is a "reef" called junk reef a little further out from Limestone reef. This is where rubble and old cables etc was dumoed many years ago. There is not much there with regard to corals, but the fish are teeming there.
    So as Carl said, there is more to building a reef than dumping the "base" there.
     
  16. Mekaeel

    Mekaeel Moderator MASA Contributor

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    are you talking about the "tires" EJ?
     
  17. Dober Man

    Dober Man

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    Nope, the tyres is a haven for shrimp and big eels. Junk reef is further out to sea.
     
  18. Mekaeel

    Mekaeel Moderator MASA Contributor

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    ok,havent dived there.yeah the tires got lotsa eels and big butterflys
     
  19. viper357

    viper357 Thread Starter Admin MASA Contributor

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    Subject: Reef Ball Foundation on CNN This Week & Weekend--Larry King & Others

    The CNN Heroes piece on Todd Barber is scheduled to air this Thursday, March 6th on Larry King Live, 9-10P ET. It will reair on CNN USA, Headline News, CNN International and CNN en Espanol. Please see the air schedule below. This is a TENTATIVE air schedule. Breaking news could preempt us at anytime and they don’t always reair the piece.



    The Todd Barber web material will be available for viewing on March 6th. You can also go there to get a sneak peak at the segment and check out the web extra. Visit our website at CNN Heroes - Special Reports from CNN.com.



    Thank you so much for all of your help. I hope that you all enjoy the segment and I look forward to hearing your feedback.



    Best,

    Leslie Askew





    CNN USA AIR SCHEDULE

    Thursday 9-10P/12-1A (LKL)

    Friday 8-9A, 11A-12P (American Morning, CNN Newsroom)

    Saturday 10-11A, 5-6P





    HEADLINE NEWS AIR SCHEDULE

    Friday 1:30-2P

    Friday 5-6P

    Friday 8-9P/10-11P/1-2A (Nancy Grace)

    Saturday 8:30-9A





    CNN en ESPANOL AIR SCHEDULE

    Monday:

    - Premiere in Panorama Mundial 9pm EST



    Tuesday:

    - Al Dia 7am

    - Nuestro Mundo 2pm

    - Encuentro 6pm

    - Directo 7pm



    Sunday:

    - Mirador Mundial 7pm





    CNN INTERNATIONAL AIR SCHEDULE

    Friday 2A, 7A, 12P, 8P

    Weekend Run of Network
     
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