作者
Dan H. Shugar,Mylène Jacquemart,David Shean,Shashank Bhushan,Kshitiz Upadhyay,Ashim Sattar,Wolfgang Schwanghart,Sara K. McBride,M. Van Wyk de Vries,Martin Mergili,Adam Emmer,César Deschamps-Berger,Mark McDonnell,Rakesh Bhambri,Simon Allen,Etienne Berthier,Jonathan L. Carrivick,John J. Clague,M. Dokukin,Stuart Dunning,Holger Frey,Simon Gascoin,Umesh K. Haritashya,Christian Huggel,Andreas Kääb,Jeffrey S. Kargel,J. L. Kavanaugh,Pascal G. Lacroix,David N. Petley,Summer Rupper,Mohd Farooq Azam,Simon J. Cook,A. P. Dimri,Mats Eriksson,Daniel Farinotti,Joel Fiddes,Kaushal Raj Gnyawali,Sandy Harrison,M. Jha,Michele Koppes,Abhishek Kumar,Silvan Leinss,Ulfat Majeed,Suraj Mal,Arnab Muhuri,Jeannette Noetzli,Frank Paul,Irfan Rashid,Kalachand Sain,Jakob F. Steiner,F. Ugalde,Cameron S. Watson,Matthew J. Westoby
摘要
On 7 Feb 2021, a catastrophic mass flow descended the Ronti Gad, Rishiganga, and Dhauliganga valleys in Chamoli, Uttarakhand, India, causing widespread devastation and severely damaging two hydropower projects. Over 200 people were killed or are missing. Our analysis of satellite imagery, seismic records, numerical model results, and eyewitness videos reveals that ~27x106 m3 of rock and glacier ice collapsed from the steep north face of Ronti Peak. The rock and ice avalanche rapidly transformed into an extraordinarily large and mobile debris flow that transported boulders >20 m in diameter, and scoured the valley walls up to 220 m above the valley floor. The intersection of the hazard cascade with downvalley infrastructure resulted in a disaster, which highlights key questions about adequate monitoring and sustainable development in the Himalaya as well as other remote, high-mountain environments.