Publikationsdatum:
2022-10-27
Beschreibung:
Author Posting. © American Geophysical Union, 2020. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Earth Surface 125(8),(2020): e2020JF005558, doi:10.1029/2020JF005558.
Beschreibung:
Sediment supply is a primary factor in determining marsh response to sea level rise and is typically approximated through high‐resolution measurements of suspended sediment concentrations (SSCs) from adjacent tidal channels. However, understanding sediment transport across the marsh itself remains limited by discontinuous measurements of SSC over individual tidal cycles. Here, we use an array of optical turbidity sensors to build a long‐term, continuous record of SSC across a marsh platform and adjacent tidal channel. We find that channel and marsh concentrations are correlated (i.e., coupled) within tidal cycles but are largely decoupled over longer time scales. We also find that net sediment fluxes decline to near zero within 10 m of the marsh edge. Together, these results suggest that large sections of the marsh platform receive minimal sediment independent of flooding frequency or channel sediment supply. Marsh‐centric, as opposed to channel‐centric, measures of sediment supply may better characterize marsh platform vulnerability.
Beschreibung:
This work was funded by NSF Awards 1529245, 1654374, 1426981, 1637630, and 1832221, the NSF Graduate Research Fellowship Program, and the USGS Climate and Land Use Research and Development program. We thank D. Walters, J. Himmelstein, D. Nicks, R. Walker, T. Messerschmidt, and the Plum Island Ecosystems LTER, especially S. Kelsey for laboratory and field assistance. Additionally, we thank C. Friedrichs, G. Guntenspergen, and O. Duran Vinent for contributing ideas that helped develop the work, and the reviewers who helped improve the manuscript. This work is Contribution Number 3928 of the Virginia Institute of Marine Science. In memoriam of David Nicks.
Beschreibung:
2021-01-27
Schlagwort(e):
Salt marsh
;
Sediment transport
;
Turbidity
;
Flux convergence
;
Decoupling
Repository-Name:
Woods Hole Open Access Server
Materialart:
Article
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