Hydrometeorological triggers of debris flows derived from historical archives and tree-ring data: Insights from the Swiss National Park

作者：Jiazhi Qie, Christophe Corona, Adrien Favillier, Stefanie Gubler, Tamara Estermann, Markus Stoffel · 发表于：The Science of The Total Environment · 年份：2025 · DOI：10.1016/j.scitotenv.2025.178880 · 被引用次数：5 · 研究领域：Landslides and related hazards、Cryospheric studies and observations、Fire effects on ecosystems

Data on past debris flows is normally scarce and biased towards large events or catchments close to settlements. Reconstructing past process activity with dendrogeomorphic approaches can help develop unbiased and spatially comprehensive timeseries, typically at annual resolution. Likewise, hydrometeorological data are often limited by low spatial or temporal resolutions, especially as one goes back in time. In the Swiss National Park (Swiss Alps), we rely on a comprehensive dataset of precisely dated debris flows covering the last >35 years and on annually-dated dendrogeomorphic timeseries of past activity at some of these sites. The completeness of records allows evaluation of different hydrometeorological datasets to assess triggers of debris flows: (i) a highly resolved, spatially explicit (1 × 1 km, hourly records) dataset extending back to 2005; (ii) daily-resolved station records available since 1917; and (iii) spatially resolved (1 × 1 km) daily temperature and precipitation fields reconstructed back to 1763. All datasets have some skills to capture debris-flow triggering storms but also limitations: While the meteorological station lacks spatial resolution and does not capture localized, convective storms well, the highly-resolved, spatially-explicit timeseries remains excessively short for the time being. As for the long-term precipitation fields, the dataset has limited skills in capturing localized, convective precipitation. We also show that debris flows only rare...