Fascinating, thanks Mitch. I like the idea of an aquatic audio "channel".
--- In Mitch Hill <> wrote:
>
> On 5/10/2012 3:45 PM, soundings23 wrote:
> > Doing some more hydrophone recordings today. Just a thought ... does de=
pth affect the sound? I'd kind of expect it too, at greater pressure I'd i=
magine sound to travel differently in what is a denser medium (if that's th=
e right way to describe it)?
> >
> > Tony
> >
> >
> Fundamentally, depth alone does not affect sound, however there are some=
> unique effects of depth that can alter the path sound takes to get to
> the hydrophone, primarily what is refereed to in oceanography as the
> "Thermocline", a level at which temperature of the surface waters and
> temperature of waters of the deep ocean go through a transition or
> inversion and act as a mirror to sound. This zone can be also used to
> advantage as a channel that can carry underwater sound great distances.
>
> However the thermocline is at greater depths than most of us need be
> concerned about it, typically below 600 feet.
>
> Another concern is the air/water interface which also acts as a mirror
> to sound, as is a very flat clean bottom such as a sand flat which will
> also act as a sound mirror.
>
> --
> --
> Mitch Hill
>
> (Sent from HP DV6T)
>
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