Debris flows triggered by storm Boris (September 2024) in the Czech Flysch Carpathians
摘要
Storm Boris brought heavy rainfall to Central Europe in mid-September 2024, triggering otherwise rare debris flows in the Czech Carpathians. Over 65 debris flows were documented, with the largest surpassing 1 km in length. These flows originated from steep watersheds that experienced nearly 300 mm of rainfall between September 13 and 15, with peak intensities reaching 40 mm.h−1. While primarily affecting remote forested areas, the event caused significant damage to forest land, roads, and hiking trails, marking some of the worst impacts in decades for Central European medium–high mountains. Although debris flows have not historically been considered a major hazard in the Czech Carpathians, their increased future frequency due to stronger cyclones driven by climate change cannot be ruled out.