Habitats, such as coral reefs, can mitigate increasing flood damages through coastal protection services. We provide a fine-scale, national valuation of the flood risk reduction benefits of coral habitats to people, property, economies and infrastructure. Across 3,100 km of US coastline, the top-most 1 m of coral reefs prevents the 100-yr flood from growing by 23% (113 km2), avoiding flooding to 53,800 (62%) people, US$2.7 billion (90%) damage to buildings and US$2.6 billion (49%) in indirect economic effects. We estimate the hazard risk reduction benefits of US coral reefs to exceed US$1.8 billion annually. Many highly developed coastlines in Florida and Hawaii receive annual benefits of over US$10 million km–1, whereas US reefs critically reduce flooding of vulnerable populations. This quantification of spatial risk reduction can help to prioritize joint actions in flood management and environmental conservation, opening new opportunities to support reef management with hazard mitigation funding.
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Hallegatte, S., Green, C., Nicholls, R. J. & Corfee-Morlot, J. Future flood losses in major coastal cities. Nat. Clim. Change 3, 802–806 (2013).
Melillo, J. M. et al. (eds) Climate Change Impacts in the United States: The Third National Climate Assessment (US Global Change Research Program, 2014); https://doi.org/10.1038/s41893-021-00706-6
Klotzbach, P. P. J., Bowen, S. G., PielKe, R. G. R. & Bell, M. Continental U.S. hurricane landfall frequency and associated damage: observations and future risks. Bull. Am. Meteorol. Soc. 99, 1359–1376 (2018).
Church, J. A. et al. in Climate Change 2013: The Physical Science Basis (eds Stocker, T. F. et al.) 1137–1216 (Cambridge Univ. Press, 2013).
Vitousek, S. et al. Doubling of coastal flooding frequency within decades due to sea-level rise. Sci. Rep. 7, 1399 (2017).
Reguero, B. G., Losada, I. J. & Méndez, F. J. A recent increase in global wave power as a consequence of oceanic warming. Nat. Commun. 10, 205 (2019).
Reguero, B. G., Losada, I. J., Díaz-Simal, P., Méndez, F. J. & Beck, M. W. Effects of climate change on exposure to coastal flooding in Latin America and the Caribbean. PLoS ONE 10, e0133409 (2015).
Neumann, B., Vafeidis, A. T., Zimmermann, J. & Nicholls, R. J. Future coastal population growth and exposure to sea-level rise and coastal flooding—a global assessment. PLoS ONE 10, e0118571 (2015).
Kumar, L. & Taylor, S. Exposure of coastal built assets in the South Pacific to climate risks. Nat. Clim. Change 5, 992–996 (2015).
Temmerman, S. et al. Ecosystem-based coastal defence in the face of global change. Nature 504, 79–83 (2013).
Borsje, B. W. et al. How ecological engineering can serve in coastal protection. Ecol. Eng. 37, 113–122 (2011).
Narayan, S. et al. The effectiveness, costs and coastal protection benefits of natural and nature-based defences. PLoS ONE 11, e0154735 (2016).
Reguero, B. G., Beck, M. W., Bresch, D. N., Calil, J. & Meliane, I. Comparing the cost effectiveness of nature-based and coastal adaptation: a case study from the Gulf Coast of the United States. PLoS ONE 13, e0192132 (2018).
Ferrario, F. et al. The effectiveness of coral reefs for coastal hazard risk reduction and adaptation. Nat. Commun. 5, 3794 (2014).
Perry, C. T. et al. Caribbean-wide decline in carbonate production threatens coral reef growth. Nat. Commun. 4, 1402 (2013).
Gardner, T. A., Côté, I. M., Gill, J. A., Grant, A. & Watkinson, A. R. Long-term region-wide declines in Caribbean corals. Science 301, 958–960 (2003).
Beck, M. W. et al. The global flood protection savings provided by coral reefs. Nat. Commun. 9, 2186 (2018).
Reguero, B. G. et al. The risk reduction benefits of the Mesoamerican Reef in Mexico. Front. Mar. Sci. 7, 125 (2019).
Narayan, S. et al. The value of coastal wetlands for flood damage reduction in the Northeastern USA. Sci. Rep. 7, 9463 (2017).
Barbier, E. B., Burgess, J. C. & Dean, T. J. How to pay for saving biodiversity. Science 360, 486–488 (2018).
Harris, D. L. et al. Coral reef structural complexity provides important coastal protection from waves under rising sea levels. Sci. Adv. 4, eaao4350 (2018).
Reguero, B. G., Beck, M. W., Agostini, V. N., Kramer, P. & Hancock, B. Coral reefs for coastal protection: a new methodological approach and engineering case study in Grenada. J. Environ. Manag. 210, 146–161 (2018).
Yates, K. K., Zawada, D. G., Smiley, N. A. & Tiling-Range, G. Divergence of seafloor elevation and sea level rise in coral reef ecosystems. Biogeosciences 14, 1739–1772 (2017).
Spalding, M. D. & Brown, B. E. Warm-water coral reefs and climate change. Science 350, 769–771 (2015).
Hughes, T. P. et al. Global warming and recurrent mass bleaching of corals. Nature 543, 373–377 (2017).
Hoegh-Guldberg, O. et al. Coral reefs under rapid climate change and ocean acidification. Science 318, 1737–1742 (2007).
Bayraktarov, E. et al. The cost and feasibility of marine coastal restoration. Ecol. Appl. 26, 1055–1074 (2016).
Duarte, C. M. et al. Rebuilding marine life. Nature 580, 39–51 (2020).
Redirecting Army Corps of Engineers Civil Works Resources During National Emergencies (Congressional Research Service, 2019); https://fas.org/sgp/crs/natsec/IF11084.pdf
Sun, F. & Carson, R. T. Coastal wetlands reduce property damage during tropical cyclones. Proc. Natl Acad. Sci. USA 117, 5719–5725 (2020).
Arkema, K. K. et al. Coastal habitats shield people and property from sea-level rise and storms. Nat. Clim. Change 3, 913–918 (2013).
Pascal, N. et al. Economic valuation of coral reef ecosystem service of coastal protection: a pragmatic approach. Ecosyst. Serv. 21, 72–80 (2016).
Menéndez, P., Losada, I. J., Torres-Ortega, S., Narayan, S. & Beck, M. W. The global flood protection benefits of mangroves. Sci. Rep. 10, 4404 (2020).
Barbier, E. B. Valuing the storm protection service of estuarine and coastal ecosystems. Ecosyst. Serv. 11, 32–38 (2015).
Whelchel, A. W., Reguero, B. G., van Wesenbeeck, B. & Renaud, F. G. Advancing disaster risk reduction through the integration of science, design and policy into eco-engineering and several global resource management processes. Int. J. Disaster Risk Reduct. 32, 29–41 (2018).
Gibbs, A. E., Cole, A. D., Lowe, E., Reguero, B. G. & Storlazzi, C. D. Projected flooding extents and depths based on 10-, 50-, 100-, and 500-year wave-energy return periods, with and without coral reefs, for the States of Hawaii and Florida, the Territories of Guam, American Samoa, Puerto Rico, and the U.S. Virgin Islands, and the Commonwealth of the Northern Mariana Islands US Geological Survey data release (USGS, 2019); https://doi.org/10.5066/P9KMH2VX
National Coastal Population Report. Population Trends from 1970 to 2020 (NOAA, 2013).
Highfield, W. E., Norman, S. A. & Brody, S. D. Examining the 100-year floodplain as a metric of risk, loss and household adjustment. Risk Anal. 33, 186–191 (2013).
Quataert, E., Storlazzi, C., van Rooijen, A., Cheriton, O. & van Dongeren, A. The influence of coral reefs and climate change on wave-driven flooding of tropical coastlines. Geophys. Res. Lett. 42, 2015GL064861 (2015).
Storlazzi, C. D. et al. Most atolls will be uninhabitable by the mid-21st century because of sea-level rise exacerbating wave-driven flooding. Sci. Adv. 4, eaap9741 (2018).
Brander, L. M. & van Beukering, P. The Total Economic Value of U.S. Coral Reefs: A Review of The Literature (NOAA, 2013).
Hughes, T. P. et al. Global warming impairs stock–recruitment dynamics of corals. Nature 568, 387–390 (2019).
Marsooli, R., Lin, N., Emanuel, K. & Feng, K. Climate change exacerbates hurricane flood hazards along US Atlantic and Gulf Coasts in spatially varying patterns. Nat. Commun. 10, 3785 (2019).
Storlazzi, C. D., Cheriton, O. M., van Hooidonk, R., Zhao, Z. & Brainard, R. Internal tides can provide thermal refugia that will buffer some coral reefs from future global warming. Sci. Rep. 10, 13435 (2020).
Cinner, J. E. et al. Bright spots among the world’s coral reefs. Nature 535, 416–419 (2016).
Mumby, P. J., Hastings, A. & Edwards, H. J. Thresholds and the resilience of Caribbean coral reefs. Nature 450, 98–101 (2007).
McCreless, E. & Beck, M. W. Rethinking our global coastal investment portfolio. J. Ocean Coast. Econ. 3, 6 (2016).
Reguero, B. G. et al. Financing coastal resilience by combining nature-based risk reduction with insurance. Ecol. Econ. 169, 106487 (2020).
Hawaiian Islands National Shoreline Management Study (USACE, 2018).
Fletcher, C. H. et al. National Assessment of Shoreline Change: Historical Shoreline Change in the Hawaiian Islands (USGS, 2012).
Williams, A., Rangel-Buitrago, N. G., Pranzini, E. & Anfuso, G. The management of coastal erosion. Ocean Coast. Manag. 156, 4–20 (2018).
Scawthorn, C. et al. HAZUS-MH flood loss estimation methodology. I: Overview and flood hazard characterization. Nat. Hazards Rev. 7, 60–71 (2006).
Scawthorn, C. et al. HAZUS-MH flood loss estimation methodology. II. Damage and loss. Assess. Nat. Hazards Rev. 7, 72–81 (2006).
Reguero, B. G., Menéndez, M., Méndez, F. J., Mínguez, R. & Losada, I. J. A Global Ocean Wave (GOW) calibrated reanalysis from 1948 onwards. Coast. Eng. 65, 38–55 (2012).
Camus, P., Mendez, F. J. & Medina, R. A hybrid efficient method to downscale wave climate to coastal areas. Coast. Eng. 58, 851–862 (2011).
Booij, N., Ris, R. & Holthuijsen, L. A third generation wave model for coastal region. I: Model description and validation. J. Geophys. Res. 104, 7649–7666 (1999).
Hoeke, R., Storlazzi, C. & Ridd, P. Hydrodynamics of a bathymetrically complex fringing coral reef embayment: wave climate, in situ observations and wave prediction. J. Geophys. Res. Ocean. 116, C04018 (2011).
Storlazzi, C. D., Elias, E. P. L. & Berkowitz, P. Many atolls may be uninhabitable within decades due to climate change. Sci. Rep. 5, 14546 (2015).
Taebi, S. & Pattiaratchi, C. Hydrodynamic response of a fringing coral reef to a rise in mean sea level. Ocean Dyn. 64, 975–987 (2014).
Storlazzi, C. D. et al. Rigorously Valuing the Role of U.S. Coral Reefs in Coastal Hazard Risk Reduction (USGS, 2019); https://doi.org/10.3133/ofr20191027
Thieler, E. R., Himmelstoss, E. A., Zichichi, J. L. & Miller, T. L. Digital Shoreline Analysis System (DSAS) version 3.0: An ArcGIS Extension for Calculating Shoreline Change (USGS, 2005).
Méndez, F. J., Menéndez, M., Luceño, A. & Losada, I. J. Estimation of the long-term variability of extreme significant wave height using a time-dependent Peak Over Threshold (POT) model. J. Geophys. Res. Ocean. 111, C07024 (2006).
Extreme Water Levels—Annual Exceedance Probability Curves (NOAA, accessed 1 March 2020); https://tidesandcurrents.noaa.gov/est/
Van Dongeren, A. et al. Numerical modeling of low-frequency wave dynamics over a fringing coral reef. Coast. Eng. 73, 178–190 (2013).
Roelvink, D. et al. Modelling storm impacts on beaches, dunes and barrier islands. Coast. Eng. 56, 1133–1152 (2009).
Pomeroy, A., Lowe, R. J., Symonds, G., Van Dongeren, A. R. & Moore, C. The dynamics of infragravity wave transformation over a fringing reef. J. Geophys. Res. 117, C11022 (2012).
Quataert, E., Storlazzi, C., van Dongeren, A. & McCall, R. The importance of explicitly modelling sea-swell waves for runup on reef-lined coasts. Coast. Eng. 160, 103704 (2020).
Montaggioni, L. F. History of Indo-Pacific coral reef systems since the last glaciation: development patterns and controlling factors. Earth Sci. Rev. 71, 1–75 (2005).
Perry, C. T. et al. Loss of coral reef growth capacity to track future increases in sea level. Nature 558, 396–400 (2018).
Kopp, R. E. et al. Probabilistic 21st and 22nd century sea-level projections at a global network of tide-gauge sites. Earth’s Future 2, 383–406 (2014).
Hughes, T. P. Catastrophes, phase shifts and large-scale degradation of a Caribbean coral reef. Science 265, 1547–1551 (1994).
Alvarez-Filip, L., Dulvy, N. K., Gill, J. A., Côté, I. M. & Watkinson, A. R. Flattening of Caribbean coral reefs: region-wide declines in architectural complexity. Proc. R. Soc. B 276, 3019–3025 (2009).
Wood, N. J., Ratliff, J. & Peters, J. Community Exposure to Tsunami Hazards in California (USGS, 2013).
2010 Statistics of U.S. businesses (SUSB) Annual Datasets by Establishment Industry Database (U.S. Census Bureau, accessed 22 February 2018); https://www.census.gov/data/tables/2010/econ/susb/2010-susb-annual.html
Olsen, A., Zhou, Q., Linde, J. & Arnbjerg-Nielsen, K. Comparing methods of calculating expected annual damage in urban pluvial flood risk assessments. Water 7, 255–270 (2015).
Buckley, M. L., Lowe, R. J., Hansen, J. E., van Dongeren, A. R. & Storlazzi, C. Mechanisms of wave‐driven water level variability on reef‐fringed coastlines. J. Geophys. Res. Oceans 123, 3811–3831 (2018).
Roeber, V. & Bricker, J. D. Destructive tsunami-like wave generated by surf beat over a coral reef during Typhoon Haiyan. Nat. Commun. 6, 7854 (2015).
Van Zanten, B. T., Van Beukering, P. J. H. & Wagtendonk, A. J. Coastal protection by coral reefs: a framework for spatial assessment and economic valuation. Ocean Coast. Manag. 96, 94–103 (2014).
Beetham, E. & Kench, P. S. Predicting wave overtopping thresholds on coral reef-island shorelines with future sea-level rise. Nat. Commun. 9, 3997 (2018).
Pearson, S. G., Storlazzi, C. D., van Dongeren, A. R., Tissier, M. F. & Reniers, A. J. H. A Bayesian-based system to assess wave-driven flooding hazards on coral reef-lined coasts. J. Geophys. Res. Ocean. 122, 10099–10117 (2017).
Anderson, T. R. et al. Modeling multiple sea level rise stresses reveals up to twice the land at risk compared to strictly passive flooding methods. Sci. Rep. 8, 14484 (2018).
Parodi, M. U. et al. Uncertainties in coastal flood risk assessments in small island developing states. Nat. Hazards Earth Syst. Sci. 20, 2397–2414 (2020).
Barnard, P. L. et al. Dynamic flood modeling essential to assess the coastal impacts of climate change. Sci. Rep. 9, 4309 (2019).
Tomás, A. et al. A methodology to estimate wave-induced coastal flooding hazard maps in Spain. J. Flood Risk Manag. 9, 289–305 (2016).
Menéndez, P., Losada, I. J., Torres-Ortega, S., Toimil, A. & Beck, M. W. Assessing the effects of using high-quality data and high-resolution models in valuing flood protection services of mangroves. PLoS ONE 14, e0220941 (2019).
We thank L. Erikson for her important insight and useful comments during the preparation of this article. This research was financially supported by the US Department of Interior, USGS through the Coastal and Marine Hazards and Resources Program’s Coral Reef Project and the US Department of Interior, Office of Insular Affairs. Additional support was provided by a Kingfisher Foundation grant to M.W.B. Any use of trade, firm or product names is for descriptive purposes only and does not imply endorsement by the US government.
The authors declare no competing interests.
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Reguero, B.G., Storlazzi, C.D., Gibbs, A.E. et al. The value of US coral reefs for flood risk reduction. Nat Sustain 4, 688–698 (2021). https://doi.org/10.1038/s41893-021-00706-6
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