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

Scientific Reports
By: , and 

Links

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.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Doubling of coastal flooding frequency within decades due to sea-level rise
Series title Scientific Reports
DOI 10.1038/s41598-017-01362-7
Volume 7
Year Published 2017
Language English
Publisher Nature
Contributing office(s) Pacific Coastal and Marine Science Center
Description Article number: 1399; 9 p.
First page 1
Last page 9