Nature-based measures can reduce inland propagation of extreme sea levels , with vertical reduction in water levels ranging from 5 to 50 cm/km behind large mangroves and marshes . They also attenuate wind-driven waves and reduce shoreline erosion , and this can be by as much as 90% over stretches of 10-100 m for dense mangrove and marsh vegetation  and up to 40% for dunes . Coral reefs on average reduce wave energy by 97% . Seagrass meadows attenuate wind waves to a lesser extent, and are only effective in water <0.2 m deep .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report