Poster_NCAS_Summer_School_17.pdf (10.19 MB)
0/0

Extreme multi-basin flooding linked with extra-tropical cyclones [Poster]

Download (10.19 MB)
poster
posted on 08.09.2017 by Paolo De Luca, John Hillier, Robert Wilby, Nevil W. Quinn, Shaun Harrigan
Fluvial floods are typically investigated as ‘events’ at the single basin-scale, hence flood management authorities may underestimate the threat of flooding across multiple basins driven by large-scale and nearly concurrent atmospheric event(s). We pilot a national-scale statistical analysis of the spatio-temporal characteristics of extreme multi-basin flooding (MBF) episodes, using peak river flow data for 260 basins in Great Britain (1975-2014), a sentinel region for storms impacting northwest and central Europe. During the most widespread MBF episode, 108 basins (~46% of the study area) recorded Annual Maximum (AMAX) discharge within a 16-day window. Such episodes are associated with persistent cyclonic and westerly atmospheric circulations, atmospheric rivers, and precipitation falling onto previously saturated ground, leading to hydrological response times <40h and documented flood impacts. Furthermore, peak flows tend to occur after 0-13 days of very severe gales causing combined and spatially-distributed, yet differentially time-lagged, wind and flood damages. These findings have implications for emergency responders, insurers and contingency planners worldwide.

History

School

  • Social Sciences

Department

  • Geography and Environment

Published in

NCAS Climate Modelling Summer School - University of Cambridge 10th-22nd Sept 2017

Citation

DE LUCA, P. ... et al, 2017. Extreme multi-basin flooding linked with extra-tropical cyclones. Presented at the NCAS Climate Modelling Summer School, University of Cambridge, Cambridge, UK, 10th-22nd Sept 2017.

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2017

Notes

This is a poster presented at the NCAS Climate Modelling Summer School, University of Cambridge, Cambridge, UK, 10th-22nd Sept 2017.

Language

en

Exports

Logo branding

Keyword(s)

Exports