Today I noticed the weird reflection pattern on a river on my way to school. As can be seen from the picture, the surface seems rough somewhere and smooth somewhere else. My question is: What causes this amazing phenomenon?
Some extra information:
- The pattern is steady, or at least the change is so slow that cannot be detected by naked eyes.
- Location: East China Normal University(Minhang Campus), Shanghai, China.
Clarification:
This question is not a duplicate of that one, because:
- The phenomenon described in this question only appears then it's rainy, while the lake surface always "appears darker in some areas".
- Darken surface is only observed "at the far area", and patches in my question is within 10 meters of me.
- The accepted answer to that question is "an interplay between the wind and the shoreline", but wind cannot produce a steady pattern.
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