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#467122 03/19/17 11:51 PM
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If the water temperature in winter has some very light floating ice, how is the water temperature 6 feet deep in a one acre lake? Georgia.

Is it the same as the surface or warmer?


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Warmer.

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water is most dense at 39 degrees...when ice capped the near surface temperature is usually 32-34 degrees. If there is little to know current on the body of water, that 39 degree water will be at or near the bottom


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Actually in most ice covered ponds/lakes 39 degree water will be at or near the bottom and up to within a foot or two of the surface. At the very bottom the water in a 1"-3" zone layer can be 40F-41F from the residual summer accumulated heat radiating from the pond bottom.


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Originally Posted By: Bill Cody
Actually in most ice covered ponds/lakes 39 degree water will be at or near the bottom and up to within a foot or two of the surface. At the very bottom the water in a 1"-3" zone layer can be 40F-41F from the residual summer accumulated heat radiating from the pond bottom.


Interesting!


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Originally Posted By: Bill Cody
Actually in most ice covered ponds/lakes 39 degree water will be at or near the bottom and up to within a foot or two of the surface. At the very bottom the water in a 1"-3" zone layer can be 40F-41F from the residual summer accumulated heat radiating from the pond bottom.


I wonder if the higher temps on bottom can also be from decaying matter? Kinda like compost giving off heat.

Last edited by farmallsc; 03/20/17 07:58 PM.


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The heat from the bottom organics decomposition is minor compared to geothermal heat released from the sediment. The bottom becomes a heat sink during summer providing the pond is destratified. At least that is what my limnology book states.

Last edited by Bill Cody; 03/21/17 09:45 AM.

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Originally Posted By: Bill Cody
The heat from the bottom organics decomposition is minor compared to geothermal heat released from the sediment. The bottom becomes a heat sink during summer providing the pond is destratified. At least that is what my limnology book states.



I have no doubt that you're right. I was just thinking out loud. laugh

Last edited by farmallsc; 03/21/17 10:23 AM.



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