Subj : ES Picture of the Day 30  2022
To   : All
From : Dan Richter
Date : Wed Mar 30 2022 12:00:54

 EPOD - a service of USRA

The Earth Science Picture of the Day (EPOD) highlights the diverse processes
and phenomena which shape our planet and our lives. EPOD will collect and
archive photos, imagery, graphics, and artwork with short explanatory
captions and links exemplifying features within the Earth system. The
community is invited to contribute digital imagery, short captions and
relevant links.


 Skypools on Surface Waves

   March 30, 2022

    IMG_8493

   Photographer:  Patti Weeks

   Summary Author:  Patti Weeks

   Shown above is an abstract image containing distorted sunlit
    reflections of the sky, clouds, and a fishing dock on a pond
   stirred up by the wind. The optical result is a mixture of wavy lines,
   swirls and a complex phenomenon called  skypools. However, viewing
   the picture from a different perspective, it could be said the abstract
   photo looks like a landscape consisting of meandering rivers, oxbow
   lakes, ponds, sandbars, and cliffs.

   Skypools are seen as distorted swirls and pools on the surface of
   gently moving bodies of water. The wind creates  vibrational
    surface waves that move the water up and down. From this motion,
   crests and troughs are formed in the constantly changing curvature of
   the water surface. We do not see straight line images, as normally seen
   in the spectral reflection of a mirror, but instead  diffuse
   reflections are visible on the waves at various degrees of  convex
   and concave angles in addition to overlapping lines of sight from
   point-to-point. The distorted images change from moment to moment,
   meaning if another viewer at a different vantage point took a photo at
   the exact same time as this photo, the image would be completely
   different.  Watch this video to see the motion of the ever-changing
   skypools and distorted reflections. Skypools are generally seen when
   the angle of the viewer’s sight is greater than 15 degrees, which
   coincides with when most of the surface of the wave is visible. Only
   when the wind stops can the water return to a relative  state of
   equilibrium. Photo taken on February 10, 2022.

   Photo details: Apple iPhone 11 Pro; 6 mm, f/2, 1/122 second exposure,
   ISO-32
     * River Park North, Greenville, North Carolina Coordinates: 35.627,
       -77.360

Related EPODs

    Skypools on Surface Waves  Great Salt Lake’s Mirabilite Mounds
    La Cascata di Fondo and Orion The Hunter  Waterfall in the
   Desert  Knik Arm Tides of Alaska  The Law of the (Colorado) River
    More...

Hydrology Links

     *  Current Sea Surface Temperature
     *  NOAA Ocean Explorer Gallery
     *  Ocean Color
     *  What is hydrology?
     *  Tides and Currents
     *  Water Resources of the United States
     *  World Waterfall Database
     *  The USGS Water Science School
     *  World Water Database
     *  The World’s Water
     *  USGS Surface Water Information Pages

-
   Earth Science Picture of the Day is a service of the  Universities
   Space Research Association.

https://epod.usra.edu
 
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