Re: [Paddlewise] Water Motion Within a Wave (was: How a Kayak Turns)

Ya... you're right. The animation doesn't fit the description. So, isn't
*that* interesting.

Craig Jungers
Royal City, WA


On 1/22/07, Dave Kruger <kdruger_at_pacifier.com> wrote:
>
> Well, this topic has generated more uncertainty than I had expected.  Bob
> Myers and I have a discussion going on, back channel, in which each of us
> is hedging on which of the diagrams we each submitted might be "correct."
> I'll confess I'm at sea, so to speak.
>
> However, I'm pretty certain of this:  Craig, watch that animation in your
> second link closely and you will see that the _motion_ of the blue dots
> does not correspond to what the _language_ in the first link says, if "As
> a
> wave arrives" is taken to mean "beginning with the trough," and "forward"
> is taken to mean "in the same direction as the wave is traveling."
>
> In fact, the animation in the second link shows the water moving _back_,
> UP
> the face (like you said originally), until the crest arrives;  then the
> water moves _forward_ and down. (I took out the ":" so the link will come
> up without editing)
>
> Craig wrote:
>
> > Here is a quick quote from http://www.mos.org/oceans/motion/wind.html
> >
> > 'As a wave arrives it lifts water particles. These travel forward,
> > then down and back so that each particle completes a circle. "
> >
> > Of course, there could be some confusion as to what constitutes the
> > "face" of a wave and what is the "back". For me, the face is the
> > frontside of a moving wave and the water particles are moving down
> > that face. Even though the water rises, the particles in the water on
> > the face of that wave are falling.
>
> > Counter-intuitive, I know.
>
> And, at odds with the animation in the second site [below], I believe.
>
> > An excellent animation of various wave motions can be found at:
> > http://www.kettering.edu/~drussell/Demos/waves/wavemotion.html
> > The animation of water waves (3rd animation down) clearly shows how
> > the particles of water behave in a wave.
>
> --
> Dave Kruger
> Astoria, OR
***************************************************************************
PaddleWise Paddling Mailing List - Any opinions or suggestions expressed
here are solely those of the writer(s). You must assume the entire
responsibility for reliance upon them. All postings copyright the author.
Submissions:     PaddleWise_at_PaddleWise.net
Subscriptions:   PaddleWise-request_at_PaddleWise.net
Website:         http://www.paddlewise.net/
***************************************************************************