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

Authors: Brown, S., Wadey, M.P., Nicholls, R.J., Shareef, A., Khaleel, Z., Hinkel, J., Lincke, D. and McCabe, M.V.

Journal: Journal of Flood Risk Management

eISSN: 1753-318X

DOI: 10.1111/jfr3.12567

Abstract:

The Maldives (land elevation approximately 1 m 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 1.9km2 1.8 m 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 ± 0.2 m of sea-level rise, with more severe, widespread flooding with 0.9 ± 0.2 m of sea-level rise. If the Paris Agreement goals are met, flooding is not anticipated this century. However, under a non-mitigation scenario, flooding could occur by the 2090s. Building seawalls 0.5, 1.0, and 1.5 m high could delay flooding for 0.2, 0.4, and 0.6 m 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.

http://eprints.bournemouth.ac.uk/32671/

Source: Scopus

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

Authors: Brown, S., Wadey, M.P., Nicholls, R.J., Shareef, A., Khaleel, Z., Hinkel, J., Lincke, D. and McCabe, M.V.

Journal: JOURNAL OF FLOOD RISK MANAGEMENT

Volume: 13

ISSN: 1753-318X

DOI: 10.1111/jfr3.12567

http://eprints.bournemouth.ac.uk/32671/

Source: Web of Science (Lite)

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

Authors: Brown, S., Wadey, M.P., Nicholls, R.J., Shareef, A., Khaleel, Z., Hinkel, J., Lincke, D. and McCabe, M.V.

Journal: Journal of Flood Risk Management

Publisher: Wiley-Blackwell

ISSN: 1753-318X

Abstract:

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.

http://eprints.bournemouth.ac.uk/32671/

Source: Manual