A new device that can triple the amplitude of a water wave by concentrating it into a small, shallow space has been unveiled by researchers in China and the US. As well as concentrating waves incident on the device, it does not reflect a significant amount of wave energy back into open water. As a result, the team believes that their prototype could soon be scaled-up to tap into the enormous potential for power generation provided by the oceans.
As waves crash into coastlines around the world, they dissipate a vast amount of kinetic energy. Over previous decades, there have been numerous attempts to collect this abundant source of renewable energy by concentrating waves into small areas, where their combined energy can be harvested more efficiently. However, the unwanted reflection of a sizable portion of wave energy from harvesting systems diminishes the actual amount of energy that is collected.
Now, an international team led by Huanyang Chen at Xiamen University and Zhenyu Wang at Zhejiang University have created a device that minimizes wave reflection. To do this, they built an annular structure consisting of a central open region surrounded by 50 thin, vertical metal sheets extending radially outwards from the centre (see figure). The top of the device stands above the incoming waves and the device has a solid floor that slopes up from the outer edges – gradually decreasing the water depth towards the centre.
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