Modeling Marsh‐Forest Boundary Transgression in Response to Storms and Sea‐Level Rise

The lateral extent and vertical stability of salt marshes experiencing rising sea levels depend on interacting drivers and feedbacks with potential for nonlinear behaviors. A two‐dimensional transect model was developed to examine changes in marsh and upland forest lateral extent and to explore cont...

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Bibliographic Details
Published in:Geophysical research letters 2020-09, Vol.47 (17), p.n/a
Main Authors: Carr, J., Guntenspergen, G., Kirwan, M.
Format: Article
Language:English
Subjects:
forest retreat
Forests
Lateral stability
marsh migration
modeling
Salt marshes
Saltmarshes
Sea level
Sea level rise
Slopes
Storms
Vertical stability
Water levels
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Summary:The lateral extent and vertical stability of salt marshes experiencing rising sea levels depend on interacting drivers and feedbacks with potential for nonlinear behaviors. A two‐dimensional transect model was developed to examine changes in marsh and upland forest lateral extent and to explore controls on marsh inland transgression. Model behavior demonstrates limited and abrupt forest retreat with long‐term upland boundary migration rates controlled by slope, sea‐level rise (SLR), high water events, and biotic‐abiotic interactions. For low to moderate upland slopes the landward marsh edge is controlled by the interaction of these inundation events and forest recovery resulting in punctuated transgressive events. As SLR rates increase, the importance of the timing and frequency of water‐level deviations diminishes, and migration rates revert back to a slope‐SLR‐dominated process. Key Points Upland transgression depends on the sequence of water‐level deviations and slope Punctuated transgressive events drive the forest boundary upslope and inland With high sea‐level rise rates, retreat rates tend to revert to a slope‐sea‐level rise‐dominated process
ISSN:0094-8276
1944-8007
DOI:10.1029/2020GL088998