The formation and development of debris flows in large watersheds after the 2008 Wenchuan Earthquake

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地灾害与地表过程重点实验室

	The formation and development of debris flows in large watersheds after the 2008 Wenchuan Earthquake
	Guo, Xiaojun1,2,3 ; Cui, Peng1,2 ; Li, Yong1,2 ; Zou, Qiang 1,3; Kong, Yingde1,3
刊名	LANDSLIDES
	2016
卷号	13 期号:1 页码:25-37
关键词	Debris flows Triggering rainfall Formation Large watershed Wenchuan earthquake
ISSN号	1612-510X
通讯作者	Cui, Peng
英文摘要	The Wenchuan earthquake has caused abundance of loose materials supplies for debris flows. Many debris flows have occurred in watersheds in area beyond 20 km(2), presenting characteristics differing from those in small watersheds. The debris flows yearly frequency decreases exponentially, and the average debris flow magnitude increases linearly with watershed size. The rainfall thresholds for debris flows in large watersheds were expressed as I = 14.7 D (-0.79) (2 h < D < 56 h), which is considerably higher than those in small watersheds as I = 4.4 D (-0.70) (2 h < D < 37 h). A case study is conducted in Ergou, 39.4 km(2) in area, to illustrate the formation and development processes of debris flows in large watersheds. A debris flow develops in a large watershed only when the rainfall was high enough to trigger the wide-spread failures and erosions on slope and realize the confluence in the watershed. The debris flow was supplied by the widely distributed failures dominated by rill erosions (14 in 22 sources in this case). The intermittent supplying increased the size and duration of debris flow. While the landslide dam failures provided most amounts for debris flows (57 % of the total amount), and amplified the discharge suddenly. During these processes, the debris flow velocity and density increased as well. The similar processes were observed in other large watersheds, indicating this case is representative.
WOS标题词	Science & Technology ; Technology ; Physical Sciences
类目[WOS]	Engineering, Geological ; Geosciences, Multidisciplinary
研究领域[WOS]	Engineering ; Geology
关键词[WOS]	RAINFALL INTENSITY ; SHALLOW LANDSLIDES ; DURATION CONTROL ; INITIATION ; COLORADO
收录类别	SCI
语种	英语
WOS记录号	WOS:000369433900003
公开日期	2016-04-26
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/15086]
专题	成都山地灾害与环境研究所_山地灾害与地表过程重点实验室中国科学院水利部成都山地灾害与环境研究所
作者单位	1.Chinese Acad Sci, Key Lab Mt Surface Proc & Hazards, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China 2.Asian Network Debris Flow, Chengdu 610041, Peoples R China 3.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Guo, Xiaojun,Cui, Peng,Li, Yong,et al. The formation and development of debris flows in large watersheds after the 2008 Wenchuan Earthquake[J]. LANDSLIDES,2016,13(1):25-37.
APA	Guo, Xiaojun,Cui, Peng,Li, Yong,Zou, Qiang,&Kong, Yingde.(2016).The formation and development of debris flows in large watersheds after the 2008 Wenchuan Earthquake.LANDSLIDES,13(1),25-37.
MLA	Guo, Xiaojun,et al."The formation and development of debris flows in large watersheds after the 2008 Wenchuan Earthquake".LANDSLIDES 13.1(2016):25-37.