IMG_9609

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This is the mouth of a stream (coming in from the right) at the Ragged Mountain Reservoir's lower lake. The pine needles floating on the surface would move about 3 feet towards the lake proper, then reverse course. The cycle would complete every 10 seconds or so. It was a windy day, so I believe there was a resonance fed by gusts of wind.

I believe my dad is taking video of the phenomenon here.

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Content
lake
photography
physics
pine needle
stream
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Charlottesville, VA *
Ragged Mountain Reservoir
USA *
Virginia *
shore
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