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Re: [PSUBS-MAILIST] a passing thought
I'm imagining that if the water is deep that the boats on the surface would go
up and back down a bit, just to make up a number say 20 feet. But this wouldn't
happen suddenly so they wouldn't notice it, with all the waves rocking the boat
around anyway. Just from guessing it seems if they went up 20 feet and back
down in 20 seconds it doesn't seem like you would feel it much. But if you were
in a sumbarine you wouldn't really move up and down 20 feet with the water in
20 seconds like you do on a boat so you would see up to 20 feet on your depth
gage.
Alex
On 30-May-2010 Marc de Piolenc wrote:
> The motion of water under wave action is roughly cycloidal. The
> amplitude is not perceptible in deep water, but increases in shoaling
> water - which, for the purpose of a huge soliton like a tsunami wave,
> could be deeper than we usually associate with wave action. Once the
> bottom shoals enough to make the wave break, the motion becomes more
> complex...
>
> As the wave passed, the sub's occupants would presumably feel both
> up-and-down and fore-and-aft motion, but because of the constraint of
> the interfaces above and below, I would expect the latter to be stronger
> than the former. I would not expect the depth gauge to give any
> indication of altered static pressure, because the sub's position in the
> water column would remain more or less the same.
>
> Further, respondent knoweth not.
>
> Marc
>
> On 5/30/2010 2:11 PM, David Bartsch wrote:
>> Do you feel it would be a large back and forth motion or that the
>> depth indicators would show a sudden increase in depth pressure for a
>> brief moment or both?
>>
>> David Bartsch
>>
>> > Date: Sun, 30 May 2010 14:04:14 +0800
>> > From: piolenc@archivale.com
>> > To: personal_submersibles@psubs.org
>> > Subject: Re: [PSUBS-MAILIST] a passing thought
>> >
>> > In deep water, you wouldn't notice a thing. In shallow water, you would
>> > notice a definite surge...
>> >
>> > Marc
>> >
>> > On 5/30/2010 1:44 PM, David Bartsch wrote:
>> > > In what seems like a daily increase in seismic activity World wide, I
>> > > remembered a particular Indonesian tsunami in which entire coastal
>> > > villages were completely destroyed.
>> > > Local fishermen upon returning home from a day at sea found the harbors
>> > > from which their boats operated from were no more and a sea of
>> > > destruction and debris was all that remained.
>> > > This enormous wave of energy had passed under them undetected...
>> > >
>> > > What would such an event have been like if experienced while submerged
>> > > in a submarine?
>> > >
>> > > David Bartsch
>> > >
>> > >
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God saved Noah, but Noah had to build an ark!
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