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

Author

Listed:
  • Alexandra Toimil

    (IHCantabria - Instituto de Hidráulica Ambiental de la Universidad de Cantabria
    French Geological Survey)

  • Iñigo J. Losada

    (IHCantabria - Instituto de Hidráulica Ambiental de la Universidad de Cantabria)

  • Moisés Álvarez-Cuesta

    (IHCantabria - Instituto de Hidráulica Ambiental de la Universidad de Cantabria)

  • Gonéri Cozannet

    (French Geological Survey)

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 be more 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.

Suggested Citation

  • Alexandra Toimil & Iñigo J. Losada & Moisés Álvarez-Cuesta & Gonéri Cozannet, 2023. "Demonstrating the value of beaches for adaptation to future coastal flood risk," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-39168-z
    DOI: 10.1038/s41467-023-39168-z
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