The spatially variable effects of mangroves on flood depths and losses from storm surges in Florida
Mangroves modify storm surges with impacts to property damages from tropical cyclones (TC), but the magnitude of these effects and their spatial variability are not well understood especially at sub-county scales. We use high-resolution storm surge flood and loss models to examine variation in the effects of mangroves on these losses spatially and by storm intensity in Florida. We estimate that mangroves reduce storm surge losses to properties by $67.5 million annually in Collier County in western Florida with over half the cumulative benefits from storm surges with return periods under 30 years. We estimate the benefits of mangroves during hurricanes Irma (2017) and Ian (2022) as US$ 725 Million and $4.1 Billion. We show that flood depths and losses are always lower for properties landward of mangroves but can increase for properties seaward or between mangroves, underlining the importance of nuanced descriptions of variability in mangrove effects during storms.
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