Modeling Marsh Dynamics Using a 3-D Coupled Wave-Flow-Sediment Model

Salt marshes are dynamic biogeomorphic systems that respond to external physical factors, including tides, sediment transport, and waves, as well internal processes such autochthonous soil formation. Predicting the fate of requires a modeling framework accounts for these in coupled fashion. In this study, we implement two new marsh 3-D COAWST (coupled-ocean-atmosphere-wave transport) model. The added erosion edge scarp caused by lateral wave thrust from surface waves vertical accretion driven biomass production on platform. released during causes change bathymetry, thereby modifying wave-energy reaching edge. Marsh due is considered single vegetation species determined hydroperiod parameters (tidal datums) elevation cells. Tidal datums stored at user-defined intervals hindcast (on order days) used update growth formulation. Idealized domains utilized verify formulation show dynamics leading horizontal retreat simulations Reedy Dinner Creeks within Barnegat Bay estuary system demonstrate model capability account both realistic complex. dominated organic deposition interior, whereas mineral estuarine sediments occurs predominantly along channel edges. ability capture can be extended simulate impacts future storms relative sea-level rise (RSLR) scenarios salt-marsh ecomorphodynamics.