I finally took a peek at how giant wave pools work. It was not as I expected it to be. (I am not sure this is how a blizzard beach or typhoon lagoon works but it seems logical that they do)
I start you at page three of the article as the previous pages are regarding kiddie gentle wave pools. Don't click the video links as none of them work:
Just Add Water - How Wave Pools Work
(3,4, and 5 are the most pertinent)