A supply-limited torrent that does not feel the heat of climate change

Jiazhi Qie (), Adrien Favillier, Frédéric Liébault, Juan Antonio Ballesteros Cánovas, Jérôme Lopez-Saez, Sébastien Guillet, Loïc Francon, Yihua Zhong, Markus Stoffel () and Christophe Corona
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Jiazhi Qie: University of Geneva
Adrien Favillier: University of Geneva
Frédéric Liébault: IGE
Juan Antonio Ballesteros Cánovas: University of Geneva
Jérôme Lopez-Saez: University of Geneva
Sébastien Guillet: University of Geneva
Loïc Francon: University of Geneva
Yihua Zhong: University of Geneva
Markus Stoffel: University of Geneva
Christophe Corona: University of Geneva

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Debris-flow activity in the Alps is anticipated to undergo pronounced changes in response to a warming climate. Yet, a fundamental challenge in comprehensively assessing changes in process activity is the systematic lack of long-term observational debris-flow records. Here, we reconstruct the longest, continuous time series (1626-2020) of debris flows at Multetta, a supply-limited torrential system in the Eastern Swiss Alps. Relying on growth-ring records of trees that were damaged by debris flows, we do not detect significant changes in the frequency or magnitude over time. This seeming absence of a direct climatic influence on debris-flow initiation aligns with the regular distribution of repose time patterns, indicating a dependence of local process activity on sediment discharge and recharge. This stark difference in process behavior between our supply-limited site and transport-limited catchments has implications for assessing torrential hazard and risk mitigation in a context of global warming.

Date: 2024
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DOI: 10.1038/s41467-024-53316-z

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