Utilizing electricity to combat coastal erosion
Northwestern University researchers have found that a mild electric current can strengthen marine coastlines, reducing erosion caused by climate change and rising sea levels. Inspired by shell-dwelling sea life, the researchers used dissolved minerals in seawater to create a natural cement between sand grains using electrical energy. This innovative method, detailed in a study published in a Nature Portfolio journal, offers a sustainable and cost-effective solution for protecting coastal areas.
Traditional erosion mitigation methods such as sea walls and injected cement are expensive and not long-lasting. Sea walls can also erode over time, causing them to collapse. In contrast, the researchers’ technique uses a mild electric current to turn dissolved minerals in seawater into solid minerals that bind sand particles together, creating a rock-like solid. This process can be reversed by switching the electrodes, making it eco-friendly and harmless to marine life.
The treated sand, which can withstand environmental stressors, costs only $3 to $6 per cubic meter compared to up to $70 for conventional methods. The technique can also be used to repair cracked reinforced concrete structures and stabilize soil slopes, offering versatile applications for coastal protection. Future plans include testing the method on actual beaches to assess its effectiveness outside the laboratory.
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Michael Thompson earned his degree in Agricultural Engineering from Purdue University in the USA, specializing in precision agriculture and smart farming technologies. His work revolves around the development of automated systems that increase farm efficiency and reduce environmental impact. Michael is now a senior engineer at a leading agri-tech company, where he designs innovative solutions for modern agriculture.