气候变化领域集成服务门户(CCPortal): New insights into the delayed initiation of a debris flow in southwest China

CCPortal

DOI	10.1007/s11069-021-04803-9
	New insights into the delayed initiation of a debris flow in southwest China
	Peng T.; Chen N.; Hu G.; Tian S.; Han Z.; Liu E.
发表日期	2021
ISSN	0921030X
起始页码	2855
结束页码	2877
卷号	108 期号:3
英文摘要	On 6 July 2020, 3 h 40 min after rainfall stopped, a delayed debris-flow disaster occurred due to colluvium deposits in a hollow region (CDH) in the Chenghuangmiao Gully, Sichuan Province, China, resulting in 4 deaths and 27 injuries. This study explores the initiation process of the delayed debris flow and the cause for the delay. Field investigations, catchment geometry interpretation, laboratory tests, theoretical calculations, and fluid–solid coupling numerical simulation were performed to obtain landslide parameters and understand the mechanisms of the event. Results show that (1) the event was a giant low-frequency viscous debris flow. (2) It was initiated by the delayed landslide process under the influence of back-end confluence. (3) The debris-flow discharge in the main gully increased over 19.5 min. (4) The seepage process inside the CDH continued for 3 h 20 min after the rainfall stopped before the pore pressure and reduction in strength were sufficient to initiate the debris flow. This research provides new insights on delayed debris-flow disasters and can be a reference for improving disaster management systems, especially monitoring and early warning systems, thereby avoiding future casualties. © 2021, The Author(s), under exclusive licence to Springer Nature B.V.
关键词	Delayed debris flow Fluid–solid coupling Hollow deposits Landslide initiation
语种	英语
来源期刊	Natural Hazards
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206490
作者单位	Key Lab of Mountain Hazards and Surface Process, Institute of Mountain Hazards and Environment (IMHE), Chinese Academy of Sciences (CAS), Chengdu, 610041, China; University of Chinese Academy of Sciences (UCAS), Beijing, 100049, China; Academy of Plateau Science and Sustainability, Xining, 810016, China; School of Civil Engineering, Central South University, Changsha, 410075, China; State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resources and Hydropower, Sichuan University, Chengdu, 610065, China
推荐引用方式 GB/T 7714	Peng T.,Chen N.,Hu G.,et al. New insights into the delayed initiation of a debris flow in southwest China[J],2021,108(3).
APA	Peng T.,Chen N.,Hu G.,Tian S.,Han Z.,&Liu E..(2021).New insights into the delayed initiation of a debris flow in southwest China.Natural Hazards,108(3).
MLA	Peng T.,et al."New insights into the delayed initiation of a debris flow in southwest China".Natural Hazards 108.3(2021).