Christopher J. Kingwell
Casey M. Stuht
Diana DiLeonardo
Travis E. Swanson, The Water Institute
Soupy Dalyander, The Water Institute
Barrier islands are shaped by a variety of short- and long-term environmental processes such as storms and relative sea level rise. These islands, found along the estuarine-marine interface, provide ecosystem services including storm surge and wave attenuation, erosion protection to inland marshes, habitat for fish and wildlife, and recreation. Natural resource managers require actionable information on how barrier island resilience and resistance change over time. This information strengthens managers’ understanding of how an island’s current state relates to past conditions and informs restoration focus. The U.S. Geological Survey and The Water Institute are collaborating on a study, which is being funded by the Louisiana Trustee Implementation Group, to develop indicators of resilience and resistance for barrier islands in Louisiana. Here, resilience captures island persistence on yearly to decadal time scales, and resistance captures persistence on event time scales of days to weeks. We have developed resilience indicators based on subaerial land and vegetation coverage from satellite imagery that capture the state of islands in the context of their long-term trajectories. Similarly, we have developed resistance indicators based on subaerial island configuration and water level recurrence as a proxy for evaluating island resistance to storms. Our approach utilizes readily available land cover products and elevation datasets to develop screening-level metrics related to barrier island resilience and resistance. The team developed additional targeted resilience and resistance indicators and associated analyses to provide detailed information for specific time periods or management applications (e.g., wildlife management). The team will present these results and illustrate how the metrics can be used to compare islands regionally along the Gulf Coast to evaluate the impact of restoration activities.