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|Title: ||Extreme multi-basin flooding linked with extra-tropical cyclones [Poster]|
|Authors: ||De Luca, Paolo|
Hillier, John K.
Wilby, Robert L.
Quinn, Nevil W.
|Issue Date: ||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.|
|Abstract: ||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.|
|Description: ||This is a poster presented at the NCAS Climate Modelling Summer School, University of Cambridge, Cambridge, UK, 10th-22nd Sept 2017.|
|Version: ||Accepted for publication|
|Publisher Link: ||https://www.ncas.ac.uk/en/climate-modelling-summer-school|
|Appears in Collections:||Conference Papers and Contributions (Geography)|
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