ADCIRC Prediction System for Modeling Compound Flooding

In this presentation we provide an overview of the ADCIRC Prediction System (APS). This system utilizes ECMWF’s ecFlow workflow package to run the ADCIRC+SWAN core. Forcing includes astronomical tides, meteorological data from the MetGet multi-model meteorological API and river flow. Water level data from tide gauges are used to compute low frequency error surfaces that are included as a pseudo forcing in a data assimilation step to correct for unmodeled processes. Model output is processed and made available via GeoServer for visualization on multiple web platforms, including the Terria-based APSViz website. Ongoing work includes an interface to the HEC-RAS model and the inclusion of rain on the ADCIRC unstructured grid.

Depending on the meteorological model selected from MetGet, APS can be run for both synoptic (e.g., using GFS or NAM meteorological forcing) and tropical (e.g., HWRF, COAMPS-TC, GAHM parametric vortex model with NHC forecast parameters) events. Examples will be provided from 2022 Hurricane Ian and 2023 Hurricane Idalia.