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Demonstrating the value of beaches for adaptation to future coastal flood risk

Abstract: Cost-effective coastal flood adaptation requires a realistic valuation of losses, costs and benefits considering the uncertainty of future flood projections and limited resources for adaptation. Here we present an approach to quantify the flood protection benefits of beaches accounting for the dynamic interaction of storm erosion, long-term shoreline evolution and flooding. We apply the method in Narrabeen-Collaroy (Australia) considering uncertainty in different shared socioeconomic pathways, sea-level rise projections, and beach conditions. By 2100, results show that failing to consider erosion can underestimate flood damage by a factor of 2 and maintaining present-day beach width can avoid 785 million AUD worth assets from flood damage. By 2050, the flood protection and recreational benefits of holding the current mean shoreline could bemore than 150 times the cost of nourishment. Our results give insight on the benefits of beaches for adaptation and can help accelerate financial instruments for restoration.

 Fuente: Nature Communications, 2023, 14, 3474

 Publisher: Nature Publishing Group

 Year of publication: 2023

 No. of pages: 11

 Publication type: Article

 DOI: 10.1038/s41467-023-39168-z

 ISSN: 2041-1723

 Spanish project: PID2021-126506OB-100

 European project: info:eu-repo/grantAgreement/EC/H2020/101003598/EU/COASTAL CLIMATE CORE SERVICES/CoCliCo/

 Publication Url: https://doi.org/10.1038/s41467-023-39168-z

Authorship

MOISES ALVAREZ CUESTA

LE COZANNET, GONÉRI