The tool, CoastSat helped the researchers process 38 years of Landsat satellite photos to find correlations in beach width and ENSO cycles across more than 8000km of sandy coastline. Interestingly, they found that beaches on the southeast coast of Australia narrow during the La Niña phase and widen during El Niño periods. However, beaches on the other side of the Pacific experienced erosion during El Niño and recovered during La Niña.
For Australia, if a La Niña is predicted to arrive in the next six months, coastal communities prone to erosion should prepare for storms stripping away sand. Our recent repeat La Niñas brought large waves and heavy erosion along the New South Wales and southern Queensland coast. During this period, houses almost fell into the sea in the NSW Central Coast, while wild waves made a new passage through Bribie Island.
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