The natural coastal defenses provided by mangrove forests reduce annual flooding significantly in critical hotspots around the world. Without mangroves, flood damages would increase by more than $65 billion annually, and 15 million more people would be flooded, according to a new study published March 10 in Scientific Reports.
“Mangroves provide incredibly effective natural defenses, reducing flood risk and damages,” said Pelayo Menéndez, a postdoctoral fellow in the Institute of Marine Sciences at UC Santa Cruz and first author of the paper.
Climate change is increasing the risk of coastal flooding through its effects on sea level rise and the intensity of hurricanes. According to the study’s authors, conservation and restoration of natural defenses such as mangroves offers cost-effective ways to mitigate and adapt to these changes.
The researchers provided high-resolution estimates of the economic value of mangrove forests for flood risk reduction across more than 700,000 kilometers of coastlines worldwide. They combined engineering and economic models to provide the best analyses of coastal flood risk and mangrove benefits. Their results show when, where, and how mangroves reduce flooding, and they identified innovative ways to fund mangrove protection using economic incentives, insurance, and climate risk financing.
Read more at University of California - Santa Cruz
Image: This illustration shows the impact of storm surge on coastal infrastructure and people with and without mangrove forests. (Credit: © World Bank and Punto Aparte)