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What are some strategies for reducing ship, sonar, and
seismic airgun array noise in the oceans in order to
reduce negative effects on marine mammals?

I have also posted this to sci.physics.acoustics and 
other groups so you might want to check for replies 
there as well if you are interested.

-- 
David Dalton  d...@nfld.com   http://www.nfld.com/~dalton (home page)
http://www.nfld.com/~dalton/nf.html Newfoundland&Labrador Travel & Music
http://www.nfld.com/~dalton/dtales.html Salmon on the Thorns (mystic page)
   "Here I go again...back into the flame" (Sarah McLachlan)

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On Feb 24, 7:37=A0pm, David Dalton <dal...@nfld.com> wrote:
> What are some strategies for reducing ship, sonar, and
> seismic airgun array noise in the oceans in order to
> reduce negative effects on marine mammals?

  Reduce the use of noise-generating propulsion technologies like
propellers.

  Wooden ships and iron men? I don't think that'll work for oil
tankers.

  Know about the Dyson fan AKA "air multiplier"? Rework its fluid
dynamics for water.

  "Seismic airgun arrays" are going out of style in favor of passive
systems.

  It's worth doing even ignoring benefits to wildlife because
turbulence is expensive.

> I have also posted this to sci.physics.acoustics and
> other groups so you might want to check for replies
> there as well if you are interested.

  Meh.


  Mark L. Fergerson

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On Sat, 25 Feb 2012 00:07:50 -0330, David Dalton wrote:

> What are some strategies for reducing ship, sonar, and
> seismic airgun array noise in the oceans

You should ask the US navy.  They have been in the noise
reduction business for decades.  Maybe, however, most of
their work is still classified.

One result of the cold war game of silence has been a
propeller that reduces or eliminates cavitation at high
rotational speeds.  Cavitation can produce some serious
noise.

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In article <d...@news.eternal-september.org>,
 David Dalton <d...@nfld.com> wrote:

> What are some strategies for reducing ship, sonar, and
> seismic airgun array noise in the oceans in order to
> reduce negative effects on marine mammals?
> 
> I have also posted this to sci.physics.acoustics and 
> other groups so you might want to check for replies 
> there as well if you are interested.

I also just posted to sci.military.naval and other groups.

-- 
David Dalton  d...@nfld.com   http://www.nfld.com/~dalton (home page)
http://www.nfld.com/~dalton/nf.html Newfoundland&Labrador Travel & Music
http://www.nfld.com/~dalton/dtales.html Salmon on the Thorns (mystic page)
   "Here I go again...back into the flame" (Sarah McLachlan)

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>What are some strategies for reducing ship, sonar, and
>seismic airgun array noise in the oceans in order to
>reduce negative effects on marine mammals?
>
>I have also posted this to sci.physics.acoustics and 
>other groups so you might want to check for replies 
>there as well if you are interested.

Ships can be made quieter and sonar can be made more sensitive, so it
requires less energy, but your last requirement puzzles me. Isn't the
purpose of seismic airguns to make noise?

Steve

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