[Coral-List] Coral Reef Restorations can be Optimized to Reduce Flood Risk

Fri May 14 17:39:07 UTC 2021

Congratulations to Floortje E. Roelvink, Curt D. Storlazzi, Ap R. van Dongeren and Stuart G. Pearson for a truly ground-breaking study!

John

John W. McManus, PhD.
Professor, Marine Biology and Ecology
Rosenstiel School of Marine and Atmospheric Science (RSMAS)
University of Miami.
Website: http://www.rsmas.miami.edu/people/faculty-index/?p=john-mcmanus
ResearchGate site: http://www.researchgate.net/profile/John_Mcmanus4
Linked-In site: https://www.linkedin.com/in/john-mcmanus-a4873813/
Biographical news article: https://www.bloomberg.com/news/features/2016-12-22/coverup-in-the-south-china-sea

If you lose a diamond ring in the bedroom, don't search for it in the living room just because the light there is better.

Attachments area

________________________________
From: Coral-List <coral-list-bounces at coral.aoml.noaa.gov> on behalf of Storlazzi, Curt D via Coral-List <coral-list at coral.aoml.noaa.gov>
Sent: Wednesday, May 12, 2021 1:16 PM
To: coral-list at coral.aoml.noaa.gov <coral-list at coral.aoml.noaa.gov>
Cc: Storlazzi, Curt D <cstorlazzi at usgs.gov>; Floortje Roelvink <Floortje.Roelvink at deltares.nl>; Stuart Pearson <Stuart.Pearson at deltares.nl>; ap.vandongeren at deltares.nl <ap.vandongeren at deltares.nl>
Subject: [Coral-List] Coral Reef Restorations can be Optimized to Reduce Flood Risk

Colleagues,

Please find below the news release associated with a new open-access article published today in Frontiers in Marine Science (https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.frontiersin.org%2Farticles%2F10.3389%2Ffmars.2021.653945%2Ffull&data=04%7C01%7Cjmcmanus%40rsmas.miami.edu%7Ceb68a8478340431fe75708d916bc4a3d%7C2a144b72f23942d48c0e6f0f17c48e33%7C0%7C1%7C637565820231007673%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=7N0bbDcybh2KBVfQwotVRJHn2ghHWhaBFspPI%2BoLw6E%3D&reserved=0) that links coral reef restoration to coastal hazard risk reduction, possibly allowing pre-disaster mitigation, post-disaster restoration, and insurance funding to be used for coral reef restoration. Enjoy!

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Coral Reef Restorations can be Optimized to Reduce Flood Risk

By Tania Fitzgeorge-Balfour, science writer

A new study published to the open access publisher Frontiers sets out guidelines to maximize the benefits of reef restoration, not only for the coral ecosystem, but also to protect local communities from coastal flooding. Researchers simulated waves travelling over different reef profiles at various stages of restoration and found that to reduce the risk of flooding, the upper fore reef and middle reef flat, typically characterized by physically-robust coral species, should be targeted for restoration.

New guidelines for coral reef restoration aiming to reduce the risk of flooding in tropical coastal communities have been set out in a new study that simulated the behavior of ocean waves travelling over and beyond a range of coral reef structures. Published in Frontiers in Marine Science<https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.frontiersin.org%2Farticles%2F10.3389%2Ffmars.2021.653945%2Ffull%3Futm_source%3Dfweb%26utm_medium%3Dnblog%26utm_campaign%3Dba-sci-fmars-restoring-coral-reefs-flood-prevention&data=04%7C01%7Cjmcmanus%40rsmas.miami.edu%7Ceb68a8478340431fe75708d916bc4a3d%7C2a144b72f23942d48c0e6f0f17c48e33%7C0%7C1%7C637565820231007673%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=OxLNW44wkW1jL184j78XRRUWFrvUbkYsj5fktAlT8zk%3D&reserved=0>, these guidelines hope to optimize restoration efforts not only for the benefit of the ecosystem, but also to protect the coast and people living on it.

“Our research reveals that shallow, energetic areas such as the upper fore reef and middle reef flat, typically characterized by physically-robust coral species, should be targeted for restoration to reduce coastal flooding,” says Floortje Roelvink, lead author on the paper and researcher at Deltares, a Dutch research institute. “This will benefit both coral ecosystems and human coastal populations that rely on them for tourism, fisheries, and recreation.”

Important Structures

Coral reefs help to sustain the economy of 500m people in tropical coastal communities and can offer protection from wave-driven flooding and coastal erosion, especially in the face of climate change. Reef restoration, which involves coral planting and reef management to improve the health, abundance, and biodiversity of the ecosystem, has been suggested as a way of reducing flood risk.

“Our research can help guide the design of coral reef restorations to best increase the resiliency of coastal communities from flooding,” says Curt Storlazzi, US Geological Survey research geologist and project lead. “Such information can increase the efficiency of coral restoration efforts, assisting a range of stakeholders in not only coral reef conservation and management, but also coastal hazard risk reduction.”

“Although we know that coral reefs can efficiently attenuate ocean wave energy and reduce coastal flooding, knowledge of specifically where to locate and design coral reef restorations on specific types of reefs is lacking,” explains Ap van Dongeren, coastal morphology specialist at Deltares and project co-lead. “We were keen to fill this knowledge gap because the costs and practical constraints of reef recovery efforts necessitate an approach to design and restoration that produces the most benefit for all.”

Reef by Design

To first understand the range of naturally occurring reef shapes, such as fringing reefs, straight sloping reefs, convex reefs and reefs with an offshore shelf, the researchers analyzed a database of more than 30,000 coral reef profiles across the US, including those in the Mariana, Hawaii, and Virgin Islands.  Using these reef profiles, they numerically ‘designed’ reef restorations to be both feasible from an operational and ecological perspective and to have an expected beneficial impact on coastal flooding. The researchers established that reef restorations should not be placed too deep because of operational constraints and limit on the wave reduction efficiency. Restorations should also not be too shallow, to prevent the drying of reef restorations and reef degradation due to thermal intolerance.

Different types of coral restorations were also investigated – ‘green’, entailing solely outplanting corals, or ‘gray-green hybrid’ restorations, entailing emplacement of structures (such as ReefBalls) and then outplanting corals on top of them. The team then used a numerical model to simulate waves travelling over both the restored and unrestored coral reef profiles to see how far those waves ran up the coast, providing an indication of the effect of the different reef restorations on coastal flooding.

“We hope this study will motivate others to continue and expand on this research, among others by conducting field and laboratory experiments to validate our findings,” concludes Roelvink.

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Curt D. Storlazzi, Ph.D.

U.S. Geological Survey
Pacific Coastal and Marine Science Center
2885 Mission Street
Santa Cruz, CA 95060
https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.usgs.gov%2Fstaff-profiles%2Fcurt-d-storlazzi&data=04%7C01%7Cjmcmanus%40rsmas.miami.edu%7Ceb68a8478340431fe75708d916bc4a3d%7C2a144b72f23942d48c0e6f0f17c48e33%7C0%7C1%7C637565820231007673%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=UigLTw3Mp4pLZvNPM2d%2BLq8Z6K01sA8iTTh6EFZU6rc%3D&reserved=0

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