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Pressure variations with depth of water

 
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administration
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Joined: 24 Oct 2004
Posts: 47
Location: Nearwater

PostPosted: Mon Dec 06, 2004 6:01 pm    Post subject: Pressure variations with depth of water Reply with quote

Pressure variations

All know that the tide rises and falls but with this comes the physics of

pressure variations so it is realised that anything living their must be able to adapt or bear this variation.
Maybe some organisms make use of this pressure

differential!?? I cannot believe that some do not.


Working out the differential for example in a 5 meter tidal range:

P=pressure in Bars (our atmosphere

in air is average of 1)
d=depth of water in meters
P=(d/10)+1

so at low tide (exposed to air): d=0
P=(0/10)+1
P=1

& at high tide

(take a 5 meter Neap Tide): d=5
P=(5/10)+1
P=1.5

A 50% increase then 50% decrease is a signicant amount of pressure variation to deal with twice a

day.


After thinking about it a little further, we worked out that the maximum pressure differential would occur for organisms that resided at the low water

mark...
In the case of the 5 meter example above, anything that resided either nearer the shore or further out to sea would experience progressively less

difference.
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natalie
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Joined: 24 Oct 2004
Posts: 37
Location: Nearwater

PostPosted: Sat Dec 11, 2004 3:26 pm    Post subject: Reply with quote

Interesting.....
If they did make a use of the pressure differential for benefit, I wonder if it would be in the 3rd and 4th hour of both the tide

rise and fall, as it is the biggest differential in height, therefore presure change.

I'm refering to the rule of 12s where 3/12 of the tidal height shift in both the said

hours.

Natalie
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Abigail



Joined: 04 Dec 2004
Posts: 10
Location: Cornwall

PostPosted: Thu Feb 17, 2005 6:20 pm    Post subject: Reply with quote

It isnt uncommon that the wildlife exploit all that they can about their environment, so wouldnt be suprised. Just hadnt thought about it. Very

interesting.
Abi
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