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  • Review Article
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Measuring, modelling and projecting coastal land subsidence

A Publisher Correction to this article was published on 17 December 2020

This article has been updated

Abstract

Coastal subsidence contributes to relative sea-level rise and exacerbates flooding hazards, with the at-risk population expected to triple by 2070. Natural processes of vertical land motion, such as tectonics, glacial isostatic adjustment and sediment compaction, as well as anthropogenic processes, such as fluid extraction, lead to globally variable subsidence rates. In this Review, we discuss the key physical processes driving vertical land motion in coastal areas. Use of space-borne and land-based techniques and the associated uncertainties for monitoring subsidence are examined, as are physics-based models used to explain contemporary subsidence rates and to obtain future projections. Steady and comparatively low rates of subsidence and uplift owing to tectonic processes and glacial isostatic adjustment can be assumed for the twenty-first century. By contrast, much higher and variable subsidence rates occur owing to compaction associated with sediment loading and fluid extraction, as well as large earthquakes. These rates can be up to two orders of magnitude higher than the present-day rate of global sea-level rise. Multi-objective predictive models are required to account for the underlying physical processes and socio-economic factors that drive subsidence.

Key points

  • Realistic estimates of the impact of sea-level rise on coastal communities require knowledge of coastal subsidence.

  • Subsidence rates due to glacial isostatic adjustment and basin tectonics are steady, except in places that experience contemporary ice loss.

  • Processes such as natural sediment compaction, organic-matter oxidation, aquifer-system and hydrocarbon-reservoir compaction, and large earthquakes cause coastal-subsidence rates that are highly variable in space and time.

  • Human effects in the coastal zone can accelerate subsidence, with rates up to two orders of magnitude higher than present-day rates of geocentric sea-level rise.

  • State-of-the-art, physics-based numerical models enable quantification of present and prediction of future coastal subsidence for a range of different natural and anthropogenic processes.

  • Coastal subsidence is a highly complex problem with large spatio-temporal variability owing to multiple processes, requiring multidisciplinary approaches to characterize the driving mechanisms and to elucidate their individual contributions, as well as to enable predictions.

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Fig. 1: Conceptual model of mechanisms causing land subsidence in the coastal zone.
Fig. 2: Measuring coastal land subsidence.
Fig. 3: Worldwide observations of coastal land subsidence.
Fig. 4: Modelling vertical land motion.
Fig. 5: Observed, modelled and predicted aquifer-system compaction and vertical land motion due to earthquake cycle.
Fig. 6: Impact of land subsidence on coastal inundation.

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Change history

  • 17 December 2020

    A correction to this paper has been published: https://doi.org/10.1038/s43017-020-00134-8.

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Acknowledgements

The authors thank the reviewers for providing insightful comments and suggestions and J. Flocks for providing constructive comments on the manuscript. M.S. is supported by the US National Aeronautics and Space Administration (grant no. 80NSSC170567) and the US National Science Foundation (grant no. EAR-1735630). J.F. is supported by the US National Aeronautics and Space Administration (grant no. 80NSSC17K0566). T.E.T. has been supported by the US National Science Foundation (grant no. EAR-1349311). T.D. is supported by the US National Science Foundation (grant nos. EAR-1624795 and EAR-1624533). P.S.J.M. is supported by an EU Marie Skłodowska-Curie Individual Fellowship (grant no. 894476 — InSPiRED — H2020-MSCA-IF-2019). This work is a contribution to the PALSEA programme and International Geoscience Programme (IGCP) project 639. Any use of trade, firm or product names is for descriptive purposes only and does not imply endorsement by the US Government.

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Related links

Harris–Galveston Subsidence District: https://hgsubsidence.org/science-research/what-is-subsidence/

Nevada Geodetic Laboratory: http://geodesy.unr.edu/

P403 station: https://www.unavco.org/instrumentation/networks/status/nota/overview/P403

SONEL: http://www.sonel.org/-GPS-.html

UNAVCO: https://www.unavco.org/

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Shirzaei, M., Freymueller, J., Törnqvist, T.E. et al. Measuring, modelling and projecting coastal land subsidence. Nat Rev Earth Environ 2, 40–58 (2021). https://doi.org/10.1038/s43017-020-00115-x

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