Global morphodynamic response of deltas to sea-level rise in the 21st century

This is a Preprint and has not been peer reviewed. This is version 2 of this Preprint.

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Authors

Jaap H Nienhuis 

Abstract

River deltas will likely experience significant land loss because of relative sea-level rise (RSLR), but predictions have remained elusive. Here, we use global data of RSLR and river sediment supply to build a validated model of delta response to RSLR for all ~10,000 deltas globally. Applying this model to predict future delta change, we find that all IPCC RCP sea-level scenarios lead to a net delta loss by the end of the 21st century, ranging from -52 ± 36 (1 s.d.) km2yr-1 for RCP2.6 to -808 ± 80 km2yr-1 for RCP8.5. We find that river dams, subsidence, and sea-level rise have had a comparable influence on reduced delta growth over the past decades, but that by 2100 under RCP8.5 more than 80% of delta land loss will be caused by climate-change driven sea-level rise.

DOI

https://doi.org/10.31223/osf.io/4w8u6

Subjects

Earth Sciences, Geomorphology, Hydrology, Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics, Sedimentology

Keywords

Erosion, River Delta, Sea-level rise, climate change, land loss, RCP, river dams, subsidence

Dates

Published: 2020-05-06 21:59

Last Updated: 2020-05-07 07:25

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License

CC BY Attribution 4.0 International

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