Impact of warmer climate periods on flood hazard in the European Alps

Wilhelm, B.; Rapuc, W.; Amann, B.; Anselmetti, F. S.; Arnaud, F.; Blanchet, J.; Brauer, A.; Czymzik, M.; Giguet-Covex, C.; Gilli, A.; Glur, L.; Grosjean, M.; Irmler, R.; Nicolle, M.; Sabatier, P.; Swierczynski, T.; Wirth, S. B. (2022). Impact of warmer climate periods on flood hazard in the European Alps. Nature geoscience, 15(2), pp. 118-123. Nature Publishing Group 10.1038/s41561-021-00878-y

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Flooding is a pervasive natural hazard—costly in both human and economic terms—and climate change will probably exacer- bate risks around the world. Mountainous areas, such as the densely populated European Alps, are of particular concern as topography and atmospheric conditions can result in large and sudden floods. In addition, the Alps are experiencing a high warming rate, which is probably leading to more heavy rainfall events. Here, we compile palaeoflood records to test the still uncertain impact these climatic trends might have on flood frequency and magnitude in the European Alps. We demonstrate that a warming of 0.5–1.2 °C, whether naturally or anthropogenically forced, led to a 25–50% decrease in the frequency of large (≥10 yr return period) floods. This decreasing trend is not conclusive in records covering less than 200 years but persistent in those ranging from 200 to 9,000 years. By contrast, extreme (>100 yr) floods may increase with a similar degree of warming in certain small alpine catchments impacted by local intensification of extreme rainfall. Our results show how long, continuous palaeoflood records can be used to disentangle complex climate–flooding relationships and assist in improving risk assessment and management at a regional scale.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geography > Physical Geography > Unit Paleolimnology
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Institute of Geological Sciences
08 Faculty of Science > Institute of Geological Sciences > Quaternary Geology
08 Faculty of Science > Institute of Geography

UniBE Contributor:

Anselmetti, Flavio and Grosjean, Martin

Subjects:

500 Science > 550 Earth sciences & geology
900 History > 910 Geography & travel

ISSN:

1752-0894

Publisher:

Nature Publishing Group

Language:

English

Submitter:

Flavio Anselmetti

Date Deposited:

28 Jan 2022 06:43

Last Modified:

17 Jun 2022 13:16

Publisher DOI:

10.1038/s41561-021-00878-y

BORIS DOI:

10.48350/164927

URI:

https://boris.unibe.ch/id/eprint/164927

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