To stop a tidal wave you need to stop the momentum of the wave. These waves are very big so it would be hard, but, if you were to level out the sea bed with machinery, pushing the sand outwards from after the swimming zones, leveling it out basically, the wave would lose momentum due to the level and start crashing earlier.
But that is expensive, so, maybe if they were to place turbines out at sea that absorb the waves power to generate electricity, big ones, they would, if secure, slow the wave down, and cycle a lot of it out to the bottom of the wave, making a huge dent in the wave.
This would be a sound investment as it will generate a lot of clean electrcity too as well as denting the wave down to size.



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