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Modelling urban floods at sub-metre resolution: challenges or opportunities for flood risk management?

Modelling urban floods at sub-metre resolution: challenges or opportunities for flood risk management?
Modelling urban floods at sub-metre resolution: challenges or opportunities for flood risk management?
In this study, we investigate the influence of fine-scale changes in the elevation of urban terrains on the dynamics and final distribution of flood inundation generated by intense rainfall. Numerical experiments have been performed combining two-dimensional shallow water model with extremely fine-resolution (10 cm) terrain data. Our results reveal that localised, decimetric-scale alterations in the elevation of streets can lead to remarkable differences in the flood inundation. These results confirm the important role played by finely resolved and accurate terrain data in capturing flow patterns that have a central impact on model predictions of flood inundation. Also, we argue that the observed sensitivity of flood inundation to small-scale topographical features paves the way to new opportunities for flood risk management measures. In particular, engineering flood resilient urban surfaces using fine-resolution models has a potential to considerably reduce flood impacts at a relatively low cost.
S855–S865
de Almeida, Gustavo A. M.
f6edffc1-7bb3-443f-8829-e471b6514a7e
Bates, Bates
e8df13bc-adab-4877-a8fc-14c812e32bd2
Ozdemir, Hasan
ba849256-8fee-4f6d-9433-7c11c479581e
de Almeida, Gustavo A. M.
f6edffc1-7bb3-443f-8829-e471b6514a7e
Bates, Bates
e8df13bc-adab-4877-a8fc-14c812e32bd2
Ozdemir, Hasan
ba849256-8fee-4f6d-9433-7c11c479581e

de Almeida, Gustavo A. M., Bates, Bates and Ozdemir, Hasan (2016) Modelling urban floods at sub-metre resolution: challenges or opportunities for flood risk management? Journal of Flood Risk Management, 11 (S2), S855–S865. (doi:10.1111/jfr3.12276).

Record type: Article

Abstract

In this study, we investigate the influence of fine-scale changes in the elevation of urban terrains on the dynamics and final distribution of flood inundation generated by intense rainfall. Numerical experiments have been performed combining two-dimensional shallow water model with extremely fine-resolution (10 cm) terrain data. Our results reveal that localised, decimetric-scale alterations in the elevation of streets can lead to remarkable differences in the flood inundation. These results confirm the important role played by finely resolved and accurate terrain data in capturing flow patterns that have a central impact on model predictions of flood inundation. Also, we argue that the observed sensitivity of flood inundation to small-scale topographical features paves the way to new opportunities for flood risk management measures. In particular, engineering flood resilient urban surfaces using fine-resolution models has a potential to considerably reduce flood impacts at a relatively low cost.

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deAlmeida_et_al_JFRM.pdf - Accepted Manuscript
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More information

Accepted/In Press date: 19 September 2016
e-pub ahead of print date: 7 November 2016
Organisations: Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 401091
URI: https://eprints.soton.ac.uk/id/eprint/401091
PURE UUID: 73be2f08-72f8-40f3-8c4a-4bae312c91d9
ORCID for Gustavo A. M. de Almeida: ORCID iD orcid.org/0000-0002-3291-3985

Catalogue record

Date deposited: 07 Oct 2016 09:16
Last modified: 10 Dec 2019 06:23

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