Comment by 317070
2 days ago
The issue is clarified with a map like this: https://i.redd.it/rontertecjqd1.jpeg
Most regions have very small tidal ranges. That doesn't mean they have small tidal currents (think of fjords or straights for example), but it does make it more likely.
And in those fjords and straights, I reckon yhese solutions will compete with boat traffic.
Fascinating. I wouldn't have expected the English Channel to have the strongest tides. I would have expected it to be the Atlantic coast of Ireland or France.
Earth without land masses would have around 0.5m to 1.5m of tides, depending if it is springs or neaps. All the higher amplitude tides are caused by resonance in the sea. The North Sea and the Channel and Irish straight are quite resonant.
Naively, you'd expect the tidal current to be proportional to (tidal range/water depth). Which causes that map to be a lot less informative.