Jim Argeropoulos wrote:
The local coast guard station does it to protect their dock in the winter. Water near the pump doesn't freeze over and I expect it's pretty thin up near the open area.
I'm not sure if they use water or air. I can't tell from shore, but it doesn't look like air.
I'm pretty sure it's water. If they were bubbling air that would oxygenate the water and make it more likely for fish to congregate there, which might bring their own problems. So long as the top of the water stays "roiled", ice won't form there until it gets really cold.
Concerning the use of bubblers in natural swimming pools, Paul's guest in the podast says she isn't convinced about the effectiveness of the bubblers as pumping devices. Paul expresses the same concern. They are missing something here: the bublers function as airlift pumps, and can be very effective and powerful if the air flow is driven up.
Air lift pumps are used a lot in water treatment plants, they move the full flow of the plant (albeit on small heights) and are incredibly simple and reliable. Using air lift pump technology that dubbles as a bubbler is an_excellent_technical solution, i.m.h.o.
It does not have to be all open, it can be stages and creative, it does not need to be all one pool.