Sea to Shore
An average-sized wave can hit the shore with up to 35,000 horse- power per 1.6 kilometres of coast – or the amount in approximately 93 Ferrari 355 F1 racing cars. so shorelines are the perfect place to build wave-harvesting machines. One of the most popular is known as a tapered channel or "tapchan" device. It acts like the moat around a beach sandcastle, funnelling water from crashing waves through a channel into land-based reservoirs. As the water answers the call of gravity and drains back to the sea, it spins an electrical turbine. A contraption called the Wave Dragon puts the tapchan principle to work in the deep sea. A proto- type of this floating "overtopping" device has gone through 20,000 hours of testing in Danish waters.
Roll with it
Not all wave-energy converters work on top or alongside the sea. some, like the WaveRoller, are fully submerged. When professional diver Rauno Koivusaari noticed a bulkhead door on a wreck flapping back and forth at the bottom of the baltic sea, the idea for WaveRoller was born. Looking for a way to harness the power of "bottom waves," he developed devices that look like square sections of an airplane wing tethered to the ocean floor. As these wings sway back and forth in the undersea currents, they drive pistons that feed into a closed hydraulic system to produce energy. Each WaveRoller can produce up to 13 kilowatts of power and can be joined to others in a field to generate even more electricity. The system is being tested in waters off the Portuguese town of Peniche.
Sea to Shore