Seafloor Carpet Harnesses Wave Energy

Many organizations around the world are looking at ways to harness the power of waves as a renewable energy source, but none are covering quite the same ground as a team of engineers from the University of California (UC), Berkeley. The seafloor carpet, a system inspired by the wave absorbing abilities of a muddy seabed, has taken exploring the potential of wave power to some intriguing new depths.

Muddy seabeds have long been known to absorb the impact of ocean waves. When a severe storm strikes in the Gulf of Mexico, local fisherman make for areas where they know the ocean floor to be heavily laden with mud, as the softer sub-surface takes the sting out of the waves and provides respite from the storm and violently surging seas.

Drawing inspiration from this, the UC team set about devising a system where the energy would not only be absorbed, but converted to usable energy.

A rubber mat forms the "carpet," which while sitting atop a grid of hydraulic actuators, cylinders and pumps, takes on the motion of the incoming waves. In moving up and down, the carpet creates hydraulic pressure in the cylinders, which is then piped back to shore to be converted to usable power.

The team emphasizes the durability and versatility as strengths of the system. As it is seabed-based, made from flexible non-corrosive materials and intended to be installed in shallow coastal water about 60 ft (18 m) deep, it should be able to "survive the strong momentum of the stormy seas." The team says the system can be easily transported and its modular design allows it to be scaled up or down in width, depending on environmental and energy demands.

In addition to offering an alternate source of energy, the conversion process produces seawater at high pressure, which can be used for desalination and distributing fresh water, a potential boon for residents in coastal regions prone to drought.

Source: gizmag.comAdded: 3 March 2014