Global long-term observations of coastal erosion and accretion

Scientific Reports
Lorenzo MentaschiLuc Feyen

Abstract

Changes in coastal morphology have broad consequences for the sustainability of coastal communities, structures and ecosystems. Although coasts are monitored locally in many places, understanding long-term changes at a global scale remains a challenge. Here we present a global and consistent evaluation of coastal morphodynamics over 32 years (1984-2015) based on satellite observations. Land losses and gains were estimated from the changes in water presence along more than 2 million virtual transects. We find that the overall surface of eroded land is about 28,000 km2, twice the surface of gained land, and that often the extent of erosion and accretion is in the order of km. Anthropogenic factors clearly emerge as the dominant driver of change, both as planned exploitation of coastal resources, such as building coastal structures, and as unforeseen side effects of human activities, for example the installment of dams, irrigation systems and structures that modify the flux of sediments, or the clearing of coastal ecosystems, such as mangrove forests. Another important driver is the occurrence of natural disasters such as tsunamis and extreme storms. The observed global trend in coastal erosion could be enhanced by Sea Level Rise ...Continue Reading

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Citations

Sep 29, 2019·Scientific Reports·Jonathan A WarrickGuy Gelfenbaum
Feb 8, 2020·Scientific Reports·Roshanka Ranasinghe
Jan 12, 2019·Scientific Reports·Gonéri Le CozannetDavid Salas-Y-Mélia
May 7, 2020·Nature Communications·Michalis I VousdoukasLuc Feyen
Dec 21, 2020·The Science of the Total Environment·Dominik PaprotnyMichalis I Vousdoukas
May 22, 2020·The Science of the Total Environment·Dhritiraj SenguptaAbhishek Banerjee
Feb 18, 2021·Scientific Reports·Nicolas PucinoDaniel Ierodiaconou
Aug 28, 2020·The Science of the Total Environment·Umberto AndrioloFilipa Bessa
Jun 6, 2021·The Science of the Total Environment·Emily Elhacham, Pinhas Alpert
Dec 27, 2021·The Science of the Total Environment·Miguel InácioPaulo Pereira

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Software Mentioned

MATLAB
- Earth
Google Earth Engine
OpenStreetMap
GSWE
- Engine

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