Long-term sea level rise modeling of a basin-tidal inlet system reveals sediment sinks.

Autor: Hanegan KC; Moffatt and Nichol, 601 Poydras St, Suite 1860, New Orleans, LA, 70130, USA., FitzGerald DM; Boston University, Department of Earth and Environment, 685 Commonwealth Avenue, Boston, MA, 02215, USA., Georgiou IY; The Water Institute, 2021 Lakeshore Dr., Suite 310, New Orleans, LA, 70122, USA. igeorgiou@thewaterinstitute.org., Hughes ZJ; Boston University, Department of Earth and Environment, 685 Commonwealth Avenue, Boston, MA, 02215, USA.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2023 Nov 06; Vol. 14 (1), pp. 7117. Date of Electronic Publication: 2023 Nov 06.
DOI: 10.1038/s41467-023-42895-y
Abstrakt: Much of the world's population lives close to coastlines and this proximity is becoming increasingly impactful because of sea-level rise (SLR). Barrier islands and backbarrier saltmarshes, which comprise >10% of these coasts, are particularly susceptible. To better understand this risk, we model backbarrier morphologic and hydrodynamic evolution over a 200-year period of SLR, incorporating an erodible bed and a range of grain sizes. Here, we show that reduction in intertidal area creates negative feedback, shifting transport of coarse sediment (silt and sand) through the inlet from net export to net import. Imposing a modest marsh vertical accretion rate decreases the period of silt and sand import to 40 years (years 90 to 130) before being exported again. Clay is continuously exported thereby decreasing inorganic deposition on marshes and threatening their sustainability. Simulated marsh loss increases tidal prism and the volume of sand contained in ebb deltas, depleting coastal sand resources.
(© 2023. The Author(s).)
Databáze: MEDLINE
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