Land raising as a solution to sea-level rise: an analysis of coastal flooding on an artificial island in the Maldives

Brown, Sally, Wadey, Matthew P., Nicholls, Robert J. ORCID:, Shareef, Ali, Khaleel, Zammath, Hinkel, Jochen, Lincke, Daniel and McCabe, Maurice V. (2020) Land raising as a solution to sea-level rise: an analysis of coastal flooding on an artificial island in the Maldives. Journal of Flood Risk Management, 13 (S1). ISSN 1753-318X

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The Maldives (land elevation approximately 1m above mean sea-level) is often associated with the threat of rising sea-levels. Land scarcity due to population pressure is also a major issue. In the late 1990s a new 1.9km^2 2m high artificial island, Hulhumalé was created for urban expansion, including an allowance for sea-level rise. This paper assesses flood exposure through an extreme water level scenario on Hulhumalé taking into account sea-level rise and analyses potential adaptation options to extend island life. Results indicate that overtopping is likely to occur with 0.6±0.2m of SLR, with more severe, widespread flooding with 0.9±0.2m of sea-level rise. If the Paris Agreement goals are met, flooding is not anticipated this century, but under a non-mitigation scenario, flooding could occur by the 2090s. Building seawalls 0.5m, 1.0m and 1.5m high could delay flooding for 0.2m, 0.4m and 0.6m of sea-level rise, respectively. Land raising has been successful in Hulhumalé in reducing flood risk simultaneous to addressing development needs. Whilst new land claim and raising can be cost-effective, raising developed land provides greater challenges, such as timeliness with respect to infrastructure design lives or financial costs. Thus the transferability and long-term benefits of land raising requires further consideration.

Item Type: Article
Uncontrolled Keywords: adaptation,defence,flooding,island,land claim,sea-level rise,environmental engineering,geography, planning and development,safety, risk, reliability and quality,water science and technology ,/dk/atira/pure/subjectarea/asjc/2300/2305
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Depositing User: LivePure Connector
Date Deposited: 04 Dec 2019 02:14
Last Modified: 22 Oct 2022 05:32
DOI: 10.1111/jfr3.12567

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