Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 46, Issue 20, Pages 11178-11187Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2019GL083315
Keywords
lateral saltmarsh dynamics; sediment supply; wave fetch; sea level rise
Categories
Funding
- Coleg Cymraeg Cenedlaethol
- Welsh Government
- Higher Education Funding Council for Wales through Ser Cymru National Research Network for Low Carbon, Energy and Environment
- Natural Environment Research Council (NERC) C-SIDE Grant [NE/R010846/1]
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO) BE-SAFE Grant [850.13.011]
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO) TTW AllRisk [P21.2]
- NERC [NE/J015644/1, NE/N013573/1, NE/R010846/1, NE/J015350/1] Funding Source: UKRI
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Salt marshes often undergo rapid changes in lateral extent, the causes of which lack common explanation. We combine hydrological, sedimentological, and climatological data with analysis of historical maps and photographs to show that long-term patterns of lateral marsh change can be explained by large-scale variation in sediment supply and its wave-driven transport. Over 150 years, northern marshes in Great Britain expanded while most southern marshes eroded. The cause for this pattern was a north to south reduction in sediment flux and fetch-driven wave sediment resuspension and transport. Our study provides long-term and large-scale evidence that sediment supply is a critical regulator of lateral marsh dynamics. Current global declines in sediment flux to the coast are likely to diminish the resilience of salt marshes and other sedimentary ecosystems to sea level rise. Managing sediment supply is not common place but may be critical to mitigating coastal impacts from climate change.
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