2025 CSDMS meeting-108

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Coupling Cross-shore and Alongshore Processes to Explore Long Term Coastline Morphodynamics

Dylan McDougall, Duke University Durham North Carolina, United States. dylan.mcdougall@duke.edu

Brad Murray, Duke University Durham North Carolina, United States. abmurray@duke.edu

Mark Piper, CSDMS Boulder Colorado, United States. mark.piper@colorado.edu

Sea level rise and changes in storm climate will modify the intensity of cross-shore sediment transport processes in the coming decades and centuries. Chief among these processes is the opening of tidal inlets on barrier islands which can affect nearby erosion rates and shoreline positions on a decadal time scale. In addition, shoreline change related to sea level rise and overwash deposition could vary alongshore in ways that could be dynamically coupled to patterns of coastline sculpting from gradients in alongshore sediment flux.

To examine how cross-shore and alongshore patterns interact, we will couple the BarrieR island and Inlet Environment (BRIE) model to the Coastline Evolution Model (CEM). BRIE has also been coupled to Barrier3D, which resolves cross-shore processes at higher resolutions. CEM was previously used to hindcast the component of coastline change patterns arising from alongshore sediment flux gradients, without including the components related to inlets or overwash. Coupled model experiments using BRIE, Barrier3D and CEM exploring how contrasting sets of processes dynamically interact will inform upcoming work to improve long term hindcasting and forecasting of shoreline change on complex coastlines.