Declining Sediments and Rising Seas: an Unfortunate Convergence for Tidal Wetlands

@article{Weston2013DecliningSA,
  title={Declining Sediments and Rising Seas: an Unfortunate Convergence for Tidal Wetlands},
  author={Nathaniel B. Weston},
  journal={Estuaries and Coasts},
  year={2013},
  volume={37},
  pages={1-23}
}
The availability of suspended sediments will be a dominant factor influencing the stability of tidal wetlands as sea levels rise. Watershed-derived sediments are a critical source of material supporting accretion in many tidal wetlands, and recent declines in wetland extent in several large river delta systems have been attributed in part to declines in sediment delivery. Little attention has been given, however, to changes in sediment supply outside of large river deltas. In this study… 
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182 Citations

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References

SHOWING 1-10 OF 57 REFERENCES
RESPONSES OF COASTAL WETLANDS TO RISING SEA LEVEL
Salt marsh ecosystems are maintained by the dominant macrophytes that regulate the elevation of their habitat within a narrow portion of the intertidal zone by accumulating organic matter and…
Rapid wetland expansion during European settlement and its implication for marsh survival under modern sediment delivery rates
Fluctuations in sea-level rise rates are thought to dominate the formation and evolution of coastal wetlands. Here we demonstrate a contrasting scenario in which land-use–related changes in sediment…
Coastal Wetland Vulnerability to Relative Sea-Level Rise: Wetland Elevation Trends and Process Controls
The distribution of tidal saline wetlands (e.g., salt marshes and mangroves) is increasingly impacted by global environmental change, including human alteration of the world’s coasts and sea-level…
The response of coastal marshes to sea‐level rise: Survival or submergence?
In order to maintain an elevation in the intertidal zone at which marsh vegetation can survive, vertical accretion of the marsh surface must take place at a rate at least equal to the rate of…
Increased Terrestrial to Ocean Sediment and Carbon Fluxes in the Northern Chesapeake Bay Associated With Twentieth Century Land Alteration
We calculated Chesapeake Bay (CB) sediment and carbon fluxes before and after major anthropogenic land clearance using robust monitoring, modeling and sedimentary data. Four distinct fluxes in the…
Watershed land use and river engineering drive wetland formation and loss in the Mississippi River birdfoot delta
The Mississippi River basin was developed for agriculture at an unprecedented scale and intensity within the last 200 yr. These changes favored erosion and sediment transport, which were subsequently…
Linking land use, erosion and sediment yields in river basins
Results obtained from erosion plots and catchment experiments provide clear evidence of the sensitivity of erosion rates to land use change and related human activity. Evidence for the impact of land…
Limits on the adaptability of coastal marshes to rising sea level
Assumptions of a static landscape inspire predictions that about half of the world's coastal wetlands will submerge during this century in response to sea‐level acceleration. In contrast, we use…
A coupled geomorphic and ecological model of tidal marsh evolution
  • M. Kirwan, A. Murray
  • Environmental Science
    Proceedings of the National Academy of Sciences
  • 2007
TLDR
A 3D model of tidal marsh accretion and channel network development that couples physical sediment transport processes with vegetation biomass productivity is developed that promotes a metastable equilibrium where the platform maintains elevation relative to a rapidly rising sea level.
Coastal eutrophication as a driver of salt marsh loss
TLDR
It is shown that nutrient levels commonly associated with coastal eutrophication increased above-ground leaf biomass, decreased the dense, below-ground biomass of bank-stabilizing roots, and increased microbial decomposition of organic matter, demonstrating that nutrient enrichment can be a driver of salt marsh loss.
...
...