Dynamics of marsh-derived sediments in lagoon-type estuaries
Kalra, Tarandeep S.
MetadataShow full item record
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.
© The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Donatelli, C., Kalra, T. S., Fagherazzi, S., Zhang, X., & Leonardi, N. Dynamics of marsh-derived sediments in lagoon-type estuaries. Journal of Geophysical Research: Earth Surface, 125(12), (2020): e2020JF005751, doi:10.1029/2020JF005751.
Suggested CitationDonatelli, C., Kalra, T. S., Fagherazzi, S., Zhang, X., & Leonardi, N. (2020). Dynamics of marsh-derived sediments in lagoon-type estuaries. Journal of Geophysical Research: Earth Surface, 125(12), e2020JF005751.
The following license files are associated with this item:
Showing items related by title, author, creator and subject.
A nonlinear relationship between marsh size and sediment trapping capacity compromises salt marshes' stability Donatelli, Carmine; Zhang, Xiaohe; Ganju, Neil K.; Aretxabaleta, Alfredo L.; Fagherazzi, Sergio; Leonardi, Nicoletta (Geological Society of America, 2020-10-01)Global assessments predict the impact of sea-level rise on salt marshes with present-day levels of sediment supply from rivers and the coastal ocean. However, these assessments do not consider that variations in marsh ...
Seagrass impact on sediment exchange between tidal flats and salt marsh, and the sediment budget of shallow bays Donatelli, Carmine; Ganju, Neil K.; Fagherazzi, Sergio; Leonardi, Nicoletta (John Wiley & Sons, 2018-05-20)Seagrasses are marine flowering plants that strongly impact their physical and biological surroundings and are therefore frequently referred to as ecological engineers. The effect of seagrasses on coastal bay resilience ...
Nutrient enrichment induces dormancy and decreases diversity of active bacteria in salt marsh sediments Kearns, Patrick J.; Angell, John H.; Howard, Evan M.; Deegan, Linda A.; Stanley, Rachel H. R.; Bowen, Jennifer L. (Nature Publishing Group, 2016-09-26)Microorganisms control key biogeochemical pathways, thus changes in microbial diversity, community structure and activity can affect ecosystem response to environmental drivers. Understanding factors that control the ...