Dynamics of Marsh-Derived Sediments in Lagoon-Type Estuaries

Donatelli, Carmine, Kalra, Tarandeep Singh, Fagherazzi, Sergio, Zhang, Xiaohe and Leonardi, Nicoletta
(2020) Dynamics of Marsh-Derived Sediments in Lagoon-Type Estuaries. JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE, 125 (12).

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<jats:title>Abstract</jats:title><jats:p>Salt marshes are valuable ecosystems that must trap sediments and accrete in order to counteract the deleterious effect of sea level rise. Previous studies have shown that the capacity of marshes to build up vertically depends on both autogenous and exogenous processes including ecogeomorphic feedbacks and sediment supply from in‐land and coastal ocean. There have been numerous efforts to quantify the role played by the sediments coming from marsh edge erosion on the resistance of salt marshes to sea level rise. However, the majority of existing studies investigating the interplay between lateral and vertical dynamics use simplified modeling approaches, and they do not consider that marsh retreat can affect the regional‐scale hydrodynamics and sediment retention in back‐barrier basins. In this study, we evaluated the fate of the sediments originating from marsh lateral loss by using high‐resolution numerical model simulations of Jamaica Bay, a small lagoonal estuary located in New York City. Our findings show that up to 42% of the sediment released during marsh edge erosion deposits on the shallow areas of the basin and over the vegetated marsh platforms, contributing positively to the sediment budget of the remaining salt marshes. Furthermore, we demonstrate that with the present‐day sediment supply from the ocean, the system cannot keep pace with sea level rise even accounting for the sediment liberated in the bay through marsh degradation. Our study highlights the relevance of multiple sediment sources for the maintenance of the marsh complex.</jats:p>

Item Type: Article
Uncontrolled Keywords: marsh erosion, sediment recycling, sea level rise, Jamaica Bay
Depositing User: Symplectic Admin
Date Deposited: 08 Dec 2020 16:24
Last Modified: 04 Sep 2023 19:29
DOI: 10.1029/2020JF005751
Open Access URL: https://doi.org/10.1029/2020JF005751
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3109652