Abstract
Coastal wetlands provide essential ecosystem services but continue to decline globally, driving demand for effective restoration. Managed realignment, which relocates sea defenses landward to reinstate tidal exchange, is a key nature-based solution for creating self-sustaining wetlands. However, unpredictable restoration outcomes highlight the need for a framework to understand the underlying physical drivers and prioritize sites. Using four decades of satellite data from 69 global sites, we show that over 80% of the restoration projects maintained or expanded wetlands. These trajectories are primarily shaped by regional sediment supply, local tide-relative elevation, and internal tidal creek connectivity. Extending this framework globally, we estimate about 920 square kilometres of wetlands lost since the 1990s could be restored under current physical conditions. Recoverable areas in Asia, the Americas, and Europe exceed the 30% target of the Kunming-Montreal Global Biodiversity Framework. By linking outcomes to multi-scale physical contexts, our results provide a framework for prioritizing restoration and advancing global biodiversity and climate goals.
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Data availability
The primary datasets generated in this study have been deposited in the Figshare database under [https://doi.org/10.6084/m9.figshare.31143697]75. The tidal wetland restoration site data used in this study are available in the OMReg, NOAA Restoration Atlas [https://www.fisheries.noaa.gov/resource/map/restoration-atlas], and ACRN databases. The Landsat imagery used in this study is available in the U.S. Geological Survey database [http://earthexplorer.usgs.gov] and the Google Earth Engine database [https://earthengine.google.com]. The high-resolution historical imagery used in this study is available in Google Earth. The surface total suspended matter (TSM) data used in this study are available in the GlobColour archive database [http://hermes.acri.fr/]. The elevation data for European sites used in this study are available in the Flanders mapping portal for Belgium [https://www.vlaanderen.be/], the IGN portal for France [https://geoservices.ign.fr/], the BKG metadata portal for Germany [https://mis.bkg.bund.de/], the CNIG download portal for Spain [https://centrodedescargas.cnig.es/], the UK Environment Agency database via [https://data.gov.uk] for the UK, and the Google Earth Engine database under the catalog AHN Netherlands 0.5 m DEM for the Netherlands [https://developers.google.com/earth-engine/datasets/catalog/AHN_AHN2_05M_INT]. The elevation data for sites in the Americas used in this study are available in the Google Earth Engine database under the catalogs Canadian Digital Elevation Model for Canada [https://developers.google.com/earth-engine/datasets/catalog/NRCan_CDEM] and USGS 3DEP 1 m National Map for the United States [https://developers.google.com/earth-engine/datasets/catalog/USGS_3DEP_1m]. The elevation data for Australian sites used in this study are available in the Google Earth Engine database under the catalog Australian 5 M DEM https://developers.google.com/earth-engine/datasets/catalog/AU_GA_AUSTRALIA_5M_DEM. The local tidal data used in this study are available in the Reeds Nautical Almanac 202076, and in the NOAA Tides & Currents [https://tidesandcurrents.noaa.gov/], Fisheries and Oceans Canada [https://tides.gc.ca/en], and Australian Hydrographic Office [https://www.hydro.gov.au/prodserv/publications/ahp11.htm] databases. The global tidal wetland loss data used in this study are available in the Global Tidal Wetland Change Dataset database [https://developers.google.com/earth-engine/datasets/catalog/JCU_Murray_GIC_global_tidal_wetland_change_2019]. The TPXO tidal model data used to derive the global tidal range in this study are available at [https://www.tpxo.net/home]. The global wetland elevation data used in this study are available in the DeltaDTM v1.1 database under accession code 10.4121/21997565.v4 [https://doi.org/10.4121/21997565.v4]. The coastline base maps used in the figures are available from Natural Earth [https://www.naturalearthdata.com/].
Code availability
The custom code used to analyze the data in this study has been deposited in the Figshare database [https://doi.org/10.6084/m9.figshare.31143697].
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant Nos. 32501413 to J.R. and 32573518 to S.W.), the National Key R&D Program of China (Grant No. 2023YFD2401903 to S.W.), the Natural Science Foundation of Shanghai (Grant Nos. 24ZR1481200 to J.R. and 23ZR1479000 to S.W.), and the Central Public-interest Scientific Institution Basal Research Fund (ECSFR, CAFS; Grant No. 2025YC01 to J.R.).
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All authors contributed intellectual input to this study. J.R. and F.Z. designed the study. J.R. compiled the managed realignment database, conducted the analyses, created the figures, and wrote the first draft of the manuscript. S.W., T.Z. (Tingting), C.C., K.Z. and C.X. contributed to data processing, methodological development, and/or data curation. D.v.d.W., J.v.d.K. and T.J.B. provided conceptual input and domain expertise and contributed to interpretation of results. J.M., T.Z. (Ting), F.C. and P.Z. contributed to the interpretation of findings and critically revised the manuscript for important intellectual content. All authors reviewed, edited, and approved the manuscript.
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Ren, J., Wang, S., Zhang, T. et al. Hydro-geomorphological drivers across scales shape the trajectory of coastal wetland restoration.
Nat Commun (2026). https://doi.org/10.1038/s41467-026-71992-x
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DOI: https://doi.org/10.1038/s41467-026-71992-x
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