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Paul Simon Kench, Author providedĪnd as the sea level rises, flooding events on atoll islands are expected to become more frequent and extreme.
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Overwash from powerful waves deposits sediment on an island’s shoreline. Our recent study, conducted alongside coastal scientist Eddie Beetham, suggests that hugely disruptive and potentially life-threatening extreme weather events may actually be required for the long-term survival of atoll islands and their communities. So while the process of wave overtopping can be very disruptive and damaging to island communities, it also seems to nurture the long-term resilience of these islands, enabling them to persist despite rising sea levels. On the other hand, when waves overwash such islands during extreme weather events, new sediment from their surrounding coral reefs is typically deposited on the island, increasing its elevation. On the one hand, these islands are among the most sensitive to the effects of climate change, with sea-level rise and potentially increasing storminess expected to make coastal flooding events more frequent and intense. Communities living on coral atoll islands, which rarely rise more than four metres above the surface of the sea, face a strange paradox.