Formation and characteristics of post-earthquake debris flow: a case study from Wenjia gully in Mianzhu, Sichuan, SW China

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

	Formation and characteristics of post-earthquake debris flow: a case study from Wenjia gully in Mianzhu, Sichuan, SW China
	Ni, H. Y.1; Zheng, W. M.1; Tie, Y. B.1; Su, P. C.2; Tang, Y. Q.1; Xu, R. G.1; Wang, D. W.1; Chen, X. Y.1
刊名	NATURAL HAZARDS
	2012-03-01
卷号	61 期号:2 页码:317-335
关键词	Wenchuan earthquake Wenjia gully Debris flow Formation mechanism Characteristic
ISSN号	0921-030X
通讯作者	Ni, H. Y.
英文摘要	During the three flood seasons following the Wenchuan earthquake in 2008, two catastrophic groups of debris flow events occurred in the earthquake-affected area: the 2008-9-24 debris flow events, which had a serious impact on rebuilding; and the 2010-8-13/14 debris flow events, which destroyed much of the progress made in rebuilding. The Wenjia gully is a typical post-earthquake debris flow gully and at least five debris flows have occurred there. As far as the 2010-8-13 debris flow is concerned, the deposits of the Wenjia gully debris flow reached a volume of 3.1 x 10(6) m(3) in volume and hundreds of newly built houses were buried. This study took the Wenjia gully debris flow as an example and discussed the formation and characteristics of post-earthquake debris flow on the basis of field investigations and a remote sensing interpretation. The conclusions drawn from the investigation and analysis were as follows: (1) Post-earthquake debris flows were a joint result of both the earthquake and heavy rainfall. (2) Gully incision and loose material provision are key processes in the initiation and occurrence of debris flows and a cycle can be presented as the following process: runoff-erosion-collapse-engulfment-debris flow-further erosion-further collapse-further engulfment-debris flow enlargement. (3) The amount of rainfall that triggered debris flows from the Wenjia gully was significantly less than the average daily rainfall, while the intraday rainfall threshold decreased by at least 23.3%. (4) The occurrence mechanism of Wenjia gully debris flow was an erosion type and there was a positive relationship between debris flow magnitude and rainfall, which fitted an exponential model. (5) There were five representative characteristics of Wenjia gully debris flow: the long duration of the occurring process; the long distance of deposition chain conversion during the process of damage; magnification in the scale of debris flow; and the high frequency of debris flow events.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences ; Water Resources
研究领域[WOS]	Geology ; Meteorology & Atmospheric Sciences ; Water Resources
关键词[WOS]	WENCHUAN EARTHQUAKE ; RAINFALL INTENSITY ; SHALLOW LANDSLIDES ; DURATION CONTROL ; COLORADO ; TAIWAN ; RANGE ; ALPS
收录类别	SCI
语种	英语
WOS记录号	WOS:000299955600002
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/9929]
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
作者单位	1.China Geol Survey, Chengdu Inst Geol & Mineral Resources, Chengdu 610081, Peoples R China 2.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China
推荐引用方式 GB/T 7714	Ni, H. Y.,Zheng, W. M.,Tie, Y. B.,et al. Formation and characteristics of post-earthquake debris flow: a case study from Wenjia gully in Mianzhu, Sichuan, SW China[J]. NATURAL HAZARDS,2012,61(2):317-335.
APA	Ni, H. Y..,Zheng, W. M..,Tie, Y. B..,Su, P. C..,Tang, Y. Q..,...&Chen, X. Y..(2012).Formation and characteristics of post-earthquake debris flow: a case study from Wenjia gully in Mianzhu, Sichuan, SW China.NATURAL HAZARDS,61(2),317-335.
MLA	Ni, H. Y.,et al."Formation and characteristics of post-earthquake debris flow: a case study from Wenjia gully in Mianzhu, Sichuan, SW China".NATURAL HAZARDS 61.2(2012):317-335.