Coastal marsh response to historical and future sea-level acceleration
Quaternary Science Reviews
By: M. Kirwan and S. Temmerman
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Abstract
We consider the response of marshland to accelerations in the rate of sea-level rise by utilizing two previously described numerical models of marsh elevation. In a model designed for the Scheldt Estuary (Belgium-SW Netherlands), a feedback between inundation depth and suspended sediment concentrations allows marshes to quickly adjust their elevation to a change in sea-level rise rate. In a model designed for the North Inlet Estuary (South Carolina), a feedback between inundation and vegetation growth allows similar adjustment. Although the models differ in their approach, we find that they predict surprisingly similar responses to sea-level change. Marsh elevations adjust to a step change in the rate of sea-level rise in about 100 years. In the case of a continuous acceleration in the rate of sea-level rise, modeled accretion rates lag behind sea-level rise rates by about 20 years, and never obtain equilibrium. Regardless of the style of acceleration, the models predict approximately 6-14 cm of marsh submergence in response to historical sea-level acceleration, and 3-4 cm of marsh submergence in response to a projected scenario of sea-level rise over the next century. While marshes already low in the tidal frame would be susceptible to these depth changes, our modeling results suggest that factors other than historical sea-level acceleration are more important for observations of degradation in most marshes today.
Suggested Citation
Kirwan, M., and Temmerman, S., 2009, Coastal marsh response to historical and future sea-level acceleration: Quaternary Science Reviews, v. 28, no. 17-18, p. 1801-1808, https://doi.org/10.1016/j.quascirev.2009.02.022.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Coastal marsh response to historical and future sea-level acceleration |
| Series title | Quaternary Science Reviews |
| DOI | 10.1016/j.quascirev.2009.02.022 |
| Volume | 28 |
| Issue | 17-18 |
| Year Published | 2009 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Quaternary Science Reviews |
| First page | 1801 |
| Last page | 1808 |