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Study: As Sea Levels Rise, Island ‘Drowning’ Is Not Inevitable

by Mr. Alan Williams
June 12, 2020, 9:37 AM
in News and Opinion
Reading Time: 3 mins read
A A
2

coral reef islandCoral reef islands across the world could naturally adapt to survive the impact of rising sea levels, according to new research.

The increased flooding caused by the changing global climate has been predicted to render such communities – where sandy or gravel islands sit on top of coral reef platforms – uninhabitable within decades.

However, an international study led by the University of Plymouth (UK) suggests that perceived fate is far from a foregone conclusion.

The research, published in Science Advances, for the first time uses numerical modeling of island morphology alongside physical model experiments to simulate how reef islands – which provide the only habitable land in atoll nations – can respond when sea levels rise.

The results show that islands composed of gravel material can evolve in the face of overtopping waves, with sediment from the beach face being transferred to the island’s surface.

This means the island’s crest is being raised as sea level rises, with scientists saying such natural adaptation may provide an alternative future that can potentially support near-term habitability, albeit with additional management challenges, possibly involving sediment nourishment, mobile infrastructure, and flood-proof housing.

The research was led by Gerd Masselink, Professor of Coastal Geomorphology in Plymouth, working with colleagues at the University of Auckland (New Zealand) and Simon Fraser University (Canada).

Professor Masselink, who heads Plymouth’s Coastal Processes Research Group, said:

“In the face of climate change and sea-level rise, coral reef islands are among the most vulnerable coastal environments on the planet. Previous research into the future habitability of these islands typically considers them inert structures unable to adjust to rising sea level. Invariably, these studies predict significantly increased risk of coastal flooding and island inundation, and the concept of ‘island loss’ has become entrenched in discourses regarding the future of coral reef island communities. In turn, this has led to attention being focused on either building structural coastal defenses or the exodus of island communities, with limited consideration of alternative adaptation strategies.

“It is important to realize that these coral reef islands have developed over hundreds to thousands of years as a result of energetic wave conditions removing material from the reef structure and depositing the material towards the back of reef platforms, thereby creating islands. The height of their surface is actually determined by the most energetic wave conditions, therefore overtopping, flooding, and island inundation are necessary, albeit inconvenient and sometimes hazardous, processes required for island maintenance.”

Co-author Professor Paul Kench, currently Dean of Science at Simon Fraser University, Canada, said:

“The model provides a step-change in our ability to simulate future island responses to sea-level rise and better resolve what the on-ground transformations will look like for island communities. Importantly, our results suggest that island drowning within the next few decades is not universally inevitable. Understanding how islands will physically change due to sea-level rise provides alternative options for island communities to deal with the consequences of climate change. It is important to stress there is no one-size-fits-all strategy that will be viable for all island communities – but neither are all islands doomed.”

For the research, scientists created a scale model of Fatato Island, part of the Funafuti Atoll in Tuvalu, and placed it in the Coastal Ocean and Sediment Transport (COAST) Lab at the University of Plymouth.

It was then subjected to a series of experiments designed to simulate predicted sea level rises with the results showing that the island’s crest rose with the rising sea level while retreating inland, as a result of water overwashing the island and depositing sediment on the island’s surface.

Read rest at University Of Plymouth

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Comments 2

  1. Graham McDonald says:
    5 years ago

    Which ‘doomed’ island recently built a new airfield for their tourist trade? Could it be that the native inhabitants know more about their islands and the ocean, probably from oral history, than “scientists” from far away places using computer models?

    Reply
  2. Dr K.A. Rodgers says:
    5 years ago

    Rediscovering Charles Darwin’s “Coral Reefs”.

    Reply

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