Doubling of coastal flooding frequency within decades due to sea-level rise | Scientific Reports

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Doubling of coastal flooding frequency within decades due to sea-level rise

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Doubling of coastal flooding frequency within decades due to sea-level rise

Received:
02 November 2016
Accepted:
23 March 2017
Published online:
18 May 2017

    Abstract

    Global climate change drives sea-level rise, increasing the frequency of coastal flooding. In most coastal regions, the amount of sea-level rise occurring over years to decades is significantly smaller than normal ocean-level fluctuations caused by tides, waves, and storm surge. However, even gradual sea-level rise can rapidly increase the frequency and severity of coastal flooding. So far, global-scale estimates of increased coastal flooding due to sea-level rise have not considered elevated water levels due to waves, and thus underestimate the potential impact. Here we use extreme value theory to combine sea-level projections with wave, tide, and storm surge models to estimate increases in coastal flooding on a continuous global scale. We find that regions with limited water-level variability, i.e., short-tailed flood-level distributions, located mainly in the Tropics, will experience the largest increases in flooding frequency. The 10 to 20 cm of sea-level rise expected no later than 2050 will more than double the frequency of extreme water-level events in the Tropics, impairing the developing economies of equatorial coastal cities and the habitability of low-lying Pacific island nations.

    https://www.nature.com/articles/s41598-017-01362-7?sf79780931=1

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