This article is about transport and the capture of energy in ocean waves. Wave-power generation is not a widely-employed commercial technology, although there have been attempts to use it since at least 1890. When an object bobs up power of six pdf free download down on a ripple in a pond, it follows approximately an elliptical trajectory.
Motion of a particle in an ocean wave. The elliptical movement of a fluid particle flattens with decreasing depth. Waves are generated by wind passing over the surface of the sea. As long as the waves propagate slower than the wind speed just above the waves, there is an energy transfer from the wind to the waves.
A given wind speed has a matching practical limit over which time or distance will not produce larger waves. When this limit has been reached the sea is said to be “fully developed”. These pressure fluctuations at greater depth are too small to be interesting from the point of view of wave power. Example: Consider moderate ocean swells, in deep water, a few km off a coastline, with a wave height of 3 m and a wave energy period of 8 seconds. 36 kilowatts of power potential per meter of wave crest. In major storms, the largest waves offshore are about 15 meters high and have a period of about 15 seconds. According to the above formula, such waves carry about 1.