If not too warm & not too cold, a winter river can warm a cold lake from the bottom up.
https://physics.aps.org/articles/v16/s1
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@physics_magazine This was a big issue with our nuclear plants and the outflow water. As long it stayed on the top, the warmth went right away to the atmosphere. However, at freezing, the warmer water would dive and kill spawning fishies. Add a billion dollars, and there was an outfall tunnel with pipe dispersers.
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@physics_magazine OMG, thank you, thank you. I would like to thank all the little people who ignored me to get this award. :)
