The linked article is a perfect example. Created to fit one specific location where it just might work and produce a pittance of energy twice every day. I'm curious if it will survive the first real test: a good storm. Never mind the power that it generates. But for sure a lot of money got blown on this.
Yes. Single waves can be 10 meters or more, the resulting currents and direction changes can easily affect the ocean up to 100 meters down from the surface.
Really, marine engineering is an art, and anything that isn't solidly anchored is going to be the oceans plaything sooner or later.
