Modeling marsh dynamics using a 3-D coupled wave-flow-sediment model
Kalra, Tarandeep S.
Ganju, Neil K.
Aretxabaleta, Alfredo L.
Carr, Joel A.
Moriarty, Julia M.
MetadataShow full item record
Salt marshes are dynamic biogeomorphic systems that respond to external physical factors, including tides, sediment transport, and waves, as well as internal processes such as autochthonous soil formation. Predicting the fate of marshes requires a modeling framework that accounts for these processes in a coupled fashion. In this study, we implement two new marsh dynamic processes in the 3-D COAWST (coupled-ocean-atmosphere-wave sediment transport) model. The processes added are the erosion of the marsh edge scarp caused by lateral wave thrust from surface waves and vertical accretion driven by biomass production on the marsh platform. The sediment released from the marsh during edge erosion causes a change in bathymetry, thereby modifying the wave-energy reaching the marsh edge. Marsh vertical accretion due to biomass production is considered for a single vegetation species and is determined by the hydroperiod parameters (tidal datums) and the elevation of the marsh cells. Tidal datums are stored at user-defined intervals as a hindcast (on the order of days) and used to update the vertical growth formulation. Idealized domains are utilized to verify the lateral wave thrust formulation and show the dynamics of lateral wave erosion leading to horizontal retreat of marsh edge. The simulations of Reedy and Dinner Creeks within the Barnegat Bay estuary system demonstrate the model capability to account for both lateral wave erosion and vertical accretion due to biomass production in a realistic marsh complex. The simulations show that vertical accretion is dominated by organic deposition in the marsh interior, whereas deposition of mineral estuarine sediments occurs predominantly along the channel edges. The ability of the model to capture the fate of the sediment can be extended to model to simulate the impacts of future storms and relative sea-level rise (RSLR) scenarios on salt-marsh ecomorphodynamics.
© The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Kalra, T. S., Ganju, N. K., Aretxabaleta, A. L., Carr, J. A., Defne, Z., & Moriarty, J. M. Modeling marsh dynamics using a 3-D coupled wave-flow-sediment model. Frontiers in Marine Science, 8, (2021): 740921, https://doi.org/10.3389/fmars.2021.740921.
Suggested CitationKalra, T. S., Ganju, N. K., Aretxabaleta, A. L., Carr, J. A., Defne, Z., & Moriarty, J. M. (2021). Modeling marsh dynamics using a 3-D coupled wave-flow-sediment model. Frontiers in Marine Science, 8, 740921.
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 ...
Natural-abundance radiocarbon as a tracer of assimilation of petroleum carbon by bacteria in salt marsh sediments Wakeham, Stuart G.; McNichol, Ann P.; Kostka, Joel E.; Pease, Tamara K. (2005-12-29)The natural abundance of radiocarbon (14C) provides unique insight into the source and cycling of sedimentary organic matter. Radiocarbon analysis of bacterial phospholipid lipid fatty acids (PLFAs) in salt-marsh sediments ...