In rare conditions, those waves arrive in an organized way or almost in phase, leading to an unusual case of constructive interference that can double the height of the resulting wave. (sciencedaily.com)
When two waves overlap, they combine in mathematically predictable ways: Where their peaks line up — a phenomenon known as constructive interference — they combine to form larger waves. (discovermagazine.com)
Having every turbine turn in the opposite direction of its neighbors, the researchers found, also increases their efficiency, perhaps because the opposing spins decrease the drag on each turbine, allowing it to spin faster (Dabiri got the idea for using this type of constructive interference from his studies of schooling fish). (treehugger.com)