Divergence of Sediment Fluxes Triggered by Sea-Level Rise Will Reshape Coastal Bays

Zhang, Xiaohe, Leonardi, Nicoletta, Donatelli, Carmine and Fagherazzi, Sergio
(2020) Divergence of Sediment Fluxes Triggered by Sea-Level Rise Will Reshape Coastal Bays. Geophysical Research Letters, 47 (13).

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Sediment budget and sediment availability are direct metrics for evaluating the resilience of coastal bays to sea‐level rise (SLR). Here we use a high‐resolution numerical model of a tidally dominated marsh‐lagoon system to explore feedbacks between SLR and sediment dynamics. SLR augments tidal prism and inundation depth, facilitating sediment deposition on the marsh platform. At the same time, our results indicate that SLR enhances ebb‐dominated currents and increases sediment resuspension, reducing the sediment‐trapping capacity of tidal flats and bays and leading to a negative sediment budget for the entire system. This bimodal distribution of sediments budget trajectories will have a profound impact on the morphology of coastal bays, increasing the difference in elevation between salt marshes and tidal flats and potentially affecting intertidal ecosystems. Our results also clearly indicate that landforms lower with respect to the tidal frame are more affected by SLR than salt marshes.

Item Type: Article
Uncontrolled Keywords: sea-level rise, salt marsh, sediment budget, numerical modeling, bed composition, tidal flats
Depositing User: Symplectic Admin
Date Deposited: 09 Sep 2020 08:45
Last Modified: 18 Jan 2023 23:34
DOI: 10.1029/2020GL087862
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3100382