Would this work to reduce or prevent Gulf hurricanes?

Yes, great suggestion.

I would like someone to try. It beats nuking them.

I suppose on a purely theoretical level, the idea might be feasible, but we are quite a ways away from achieving such an enormous feat of hydro-engineering.

Sounds like a plot from the movie Twisters. Studies have been done which say no.

A University of Miami study found that it would take 100 times the amount of energy used by the entire United States to weaken a hurricane by 15%

The pumps would have to be impractically large to raise enough cold water to have any effect. The dense cold water that is pumped up will tend to fall back down into deeper levels making the whole exercise futile.

I think two additional thoughts, one that the pumps’ motors would be ruined by the salt water and two, what about all of the marine life whose environments would be ruined by the churning?

I wondered about the marine life too.

Any large project like that would probably cause unforeseen unintended consequences.

^^ kinda like cars have.

^^or fossil fuels in general!