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Author: dechuckadechucka Date: Aug 18, 2008 16:31
Next door neighbour stupidly dropped his car keys into his farm dam while
out on his kayak. Knowing I was a diver he asked if I could try and find
them. OK we are 670m but I have dived at higher altitudes and the dam was
only 7-8ms deep so no problems.
Interestingly the water temp at the surface was about 5C and than I hit a
distinct thermocline at 3ms and the temp was 8C. Surely even with not much
wind the colder heavier water should sink below the warmer water. The dam in
question is quite large probably 1/2 a hectare and has got good inflow from
a small stream. Wondered how the warm water could sit on the bottom even
knowing that Sydney's bad smog is caused by an inversion layer where cold
air traps the warm air and pollution in the basin.
Anybody else experienced this and any theories on why it can happen
PS I soon got out of the water without his keys, far to bloody cold and he
can afford some new ones. Only had a 5mm Farmer John with hood
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Author: Greg MossmanGreg Mossman Date: Aug 18, 2008 18:19
On Aug 18, 4:31Â pm, "dechucka" vomithotmail.com> wrote:
> Anybody else experienced this and any theories on why it can happen
You're in Australia, so the thermoclines are naturally upside down?
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Author: dechuckadechucka Date: Aug 18, 2008 18:41
"Greg Mossman" qnet.com> wrote in message
news:3e81546a-dd3d-42a8-9510-9ab34c95575a@v26g2000prm.googlegroups.com...
On Aug 18, 4:31 pm, "dechucka" vomithotmail.com> wrote:
> Anybody else experienced this and any theories on why it can happen
+You're in Australia, so the thermoclines are naturally upside down?
and the water in the toilet runs backward> I have seen it on the Simpson's
so it must be true ( along with the killer Koalas )
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Author: dechuckadechucka Date: Aug 18, 2008 18:44
>
> "Greg Mossman" qnet.com> wrote in message
> news:3e81546a-dd3d-42a8-9510-9ab34c95575a@v26g2000prm.googlegroups.com...
> On Aug 18, 4:31 pm, "dechucka" vomithotmail.com> wrote:
>>> Anybody else experienced this and any theories on why it can happen
>
> +You're in Australia, so the thermoclines are naturally upside down?
>
> and the water in the toilet runs backward> I have seen it on the Simpson's
> so it must be true ( along with the killer Koalas )
ps why in America are the toilet bowls so full of water. That shits me off
but not as much as the european ones with the plate thingy at the back so
you can give it a good look before you flush it.
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Author: Joerg HahnJoerg Hahn Date: Aug 19, 2008 03:15
Hi dechuka,
dechucka wrote:
> Interestingly the water temp at the surface was about 5C and than I hit a
> distinct thermocline at 3ms and the temp was 8C.
Hmmm, temperature meter is misaligned?
If you would have mesured 2C and 4C there would be the easy
explanation of the Abnormity of Water, having the max
density at 4C, which lead to invers layers in water and lets
ice swim.
That density thingi you have also with different solutions
of salt in water which even can override the effects of
temperature to the layers.
Joerg
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Author: Lee BellLee Bell Date: Aug 19, 2008 04:57
> Interestingly the water temp at the surface was about 5C and than I hit a
> distinct thermocline at 3ms and the temp was 8C.
Wind chill of the surface water?
Heat retention of deeper water as above water temperature cools near surface
water?
Spring feeding warmer water below surface?
Other source of warm water such as an electrical generating plant?
Lee
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Author: Bryan HeitBryan Heit Date: Aug 19, 2008 07:20
On Aug 18, 7:31Â pm, "dechucka" vomithotmail.com> wrote:> Next door neighbour stupidly dropped his car keys into his farm dam while
> out on his kayak. Knowing I was a diver he asked if I could try and find
> them. OK we are 670m but I have dived at higher altitudes and the dam was
> only 7-8ms deep so no problems.
>
> Interestingly the water temp at the surface was about 5C and than I hit a
> distinct thermocline at 3ms and the temp was 8C. Surely even with not much
> wind the colder heavier water should sink below the warmer water. The dam in
> question is quite large probably 1/2 a hectare and has got good inflow from
> a small stream. Wondered how the warm water could sit on the bottom even
> knowing that Sydney's bad smog is caused by an inversion layer where cold
> air traps...
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Author: Greg MossmanGreg Mossman Date: Aug 19, 2008 07:43
On Aug 19, 7:20Â am, Bryan Heit gmail.com> wrote:
> Most likely explanation is that the lake was undergoing a turnover.
> Here in the north this usually occurs in the spring and fall, and it
> plays a central role in the ecology of most lakes.
>
> Basically, what happens is over the summer you get a layer of warmer
> water over the layer of colder water. Â By the end of summer this warm
> layer tends to be quite thick. Â When fall comes (or a cold front, etc)
> the upper layers of water cool, faster then they sink. Â This creates a
> layer of colder water at the surface. Â Eventually the sinking of this
> cold water will mix the whole lake, but for brief periods you can have
> a colder surface than the layer immediately underneath it.
Sure, in Canada maybe, but how cold does it get in Australia?
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Author: Bryan HeitBryan Heit Date: Aug 19, 2008 08:17
On Aug 19, 10:43Â am, Greg Mossman qnet.com> wrote:> On Aug 19, 7:20Â am, Bryan Heit gmail.com> wrote:
>>> Most likely explanation is that the lake was undergoing a turnover.
>> Here in the north this usually occurs in the spring and fall, and it
>> plays a central role in the ecology of most lakes.
>
>> Basically, what happens is over the summer you get a layer of warmer
>> water over the layer of colder water. Â By the end of summer this warm
>> layer tends to be quite thick. Â When fall comes (or a cold front, etc)
>> the upper layers of water cool, faster then they sink. Â This creates a
>> layer of colder water at the surface. Â Eventually the sinking of this
>> cold water will mix the whole lake, but for brief periods you can have
>> a colder surface than...
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Author: Douglas W. Popeye FrederickDouglas W. Popeye Frederick Date: Aug 19, 2008 09:02
> Next door neighbour stupidly dropped his car keys into his farm dam while
> out on his kayak. Knowing I was a diver he asked if I could try and find
> them. OK we are 670m but I have dived at higher altitudes and the dam was
> only 7-8ms deep so no problems.
>
> Interestingly the water temp at the surface was about 5C and than I hit a
> distinct thermocline at 3ms and the temp was 8C. Surely even with not much
> wind the colder heavier water should sink below the warmer water. The dam
> in question is quite large probably 1/2 a hectare and has got good inflow
> from a small stream. Wondered how the warm water could sit on the bottom
> even knowing that Sydney's bad smog is caused by an inversion layer where
> cold air traps the warm air and pollution in the basin.
>
> Anybody else experienced this and any theories on why it can happen
>
>
> PS I soon got out of the water without his keys, far to bloody cold and he
> can afford some new ones. Only had a 5mm Farmer John with hood ...
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