What... No Pictures?
Rick ;o)
On Tue, Sep 17, 2013 at 5:32 PM, Ken Norton <ken@xxxxxxxxxxx> wrote:
> > Isle Royale came to my attention through this list, otherwise I might
> > never have known of it.
>
> So, when do you want to go?
>
>
> > I fly over/past it periodically on trips between Toronto and Thunder
> > Bay, so I see it from FL220 or so. The island is long and thin, vaguely
> > east-west, and along the shores there are parallel and much smaller
> > island-lets with gaps between.
>
> Yup. Lots of shoreline irregularities. :)
>
>
> > These gaps act as irregular, natural diffraction gratings, and -
> > depending on the prevailing wind - the water between the small islands
> > and the main usually shows interference patterns.
>
> I think there are several factors in play.
>
> 1. Long wave action of Lake Superior. These are mostly broken up by
> the shoals surrounding the Islands, but enough gaps exist that they
> flow through any openings. However, as they traverse the openings,
> there is a phase shift and directional change.
>
> 2. The coves are long and narrow. A long wave coming in from Lake
> Superior will effectively change direction to line up with the cove.
>
> 3. Wind direction. The wind direction and current flow are at almost
> 90 degrees of each other. This will cause a dual wave action on the
> long coves where you have the waves travelling with the wind and other
> waves going sideways.
>
> 4. Rocky shorelines. The waves bounce off of the rocks and also
> refract around every imaginable point. This is happening from a
> wind-direction, current-direction, and long-wave direction
> perspective. So, you may end up with three distinctly different wave
> patterns on the coves as well as varying forms of refraction along the
> shoreline.
>
> 5. Water clarity. The water is very clear. The bottom shapeshifts and
> the bottom, which is mostly very large rocks and gravel, alters the
> visual stance.
>
> 6. Given the viewing distance, and the multiple beat patterns and
> extremely short peak-to-peak distance, you are very likely
> experiencing a prismatic effect, which gives the waves on the coves
> colors. A couple years ago, even some of the Google Earth images
> showed this.
>
>
> > I think of the coincidence that list members have photographed there,
> > uniting the photographic concepts of diffraction and interference and
> > the natural effects in the water.
>
> Coincidence? There were FOUR E-1s in our little group. I think that
> must have messed something up.
>
>
> --
> Ken Norton
> ken@xxxxxxxxxxx
> http://www.zone-10.com
> --
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>
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