The outburst flood and narrowed river flow eroded 2.76 × 10 6 m 3 of deposits and reactivated the Aniangzhai landslide. Large amounts of sediment entered the Xiaojinchuan River and formed a barrier lake. On June 17, 2020, a rainstorm-induced debris flow event with a volume of 2.4 × 10 5 m 3 occurred in the Meilong catchment, Danba County, Sichuan Province, Southwest China, which triggered a debris flow–outburst flood–landslide hazard chain. Predicting the multi-hazard chain’s evolution and intervening in its cascading effects by artificial countermeasures face major challenges due to the spatial and temporal variability of controlling factors. 5Sichuan Metallurgical Geological Survey Bureau, Chengdu, Chinaĭelivery of large volumes of sediment by debris flows in a short time into rivers often initiates a hazardous chain reaction in alpine valleys.4Sichuan Institute of Land and Space Ecological Restoration and Geological Hazard Prevention, Chengdu, China.
3University of Chinese Academy of Sciences, Beijing, China.2Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, China.1Key Laboratory of Mountain Hazards and Earth Surface Processes, Chinese Academy of Sciences, Chengdu, China.Lan Ning 1,2,3 Kaiheng Hu 1,2* Zhang Wang 1,2,3 Hong Luo 4 Haokun Qin 5 Xiaopeng Zhang 1,2,3 Shuang Liu 1,2