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Hindcast of Hurricane Sally impacts on barrier islands in the Gulf of Mexico

April 15, 2023

We performed XBeach and ADIRC+SWAN model simulations of Hurricane Sally over Dauphin and Petit Bois Islands off the Alabama-Mississippi coast to evaluate the morphologic response. Simulated water levels compared well with NOAA tide gauge observations to the east of Dauphin Island with a high model skill of 0.9. In addition, the XBeach model results of water levels, mean current speeds and significant wave heights agreed with ADCIRC+SWAN simulations near the offshore boundary and in the channel. Qualitative comparisons between the XBeach simulations and post-storm lidar observations confirmed model predictions of overwash. However, XBeach predicted minor breaches in Dauphin Island, which were not observed. This effort is part of a larger project in which several hydrodynamic and morphodynamic models will be coupled to produce hindcasts over a 15-year period for a larger region along the coast. These evaluations will provide local managers with strategic tools to make decisions about various coastal restoration alternatives.

Publication Year 2023
Title Hindcast of Hurricane Sally impacts on barrier islands in the Gulf of Mexico
DOI 10.1142/9789811275135_0204
Authors Donya P. Frank-Gilchrist, Davina Passeri, Matthew V. Bilskie
Publication Type Conference Paper
Publication Subtype Conference Paper
Index ID 70243156
Record Source USGS Publications Warehouse
USGS Organization St. Petersburg Coastal and Marine Science Center