Overview of the Coastal Storm Model Development and Results for the Deer Island Restoration Study Using the Engineering With Nature® Toolkit

The Coastal and Hydraulics Laboratory of the US Army Engineer Research and Development Center presents this study as a comprehensive numeri-cal model development and validation approach that can be employed to simulate winds, waves, and water levels during significant storm events for the Deer Island Restoration Project in Mississippi. Leveraging validated storms from the South Atlantic Coastal Study, this research utilized the Coastal Storm Modeling System with the coupled Advanced Circulation (ADCIRC) and Steady-State Spectral Wave (STWAVE) models. As part of this effort, the ADCIRC mesh was updated to encompass the Deer Island region and two variations on elevated water level scenarios were incorpo-rated. Specifically, 10 validated storms were simulated, with varying sea-level conditions, to represent a range of feasibility-level proxy events from a 1- to 10,000-year annual exceedance frequency. The modeling outcomes provide a detailed depiction of water levels, wave heights, and storm surge impacts on Deer Island under different sea-level rise scenarios. These re-sults offer critical insights into the potential effects of the restoration pro-ject on Deer Island and the surrounding areas. The findings can inform decision-makers and contribute to formulating effective guidelines for res-toration projects within the Mississippi region and in coastal areas facing similar challenges worldwide.