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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, Qiang1,3; Kong, Yingde1,3
Corresponding AuthorCui, Peng
2016
Source PublicationLANDSLIDES
ISSN1612-510X
EISSN1612-5118
Volume13Issue:1Pages:25-37
SubtypeArticle
AbstractThe 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.
KeywordDebris Flows Triggering Rainfall Formation Large Watershed Wenchuan Earthquake
WOS HeadingsScience & Technology ; Technology ; Physical Sciences
DOI10.1007/s10346-014-0541-6
WOS Subject ExtendedEngineering ; Geology
Indexed BySCI
WOS KeywordRAINFALL INTENSITY ; SHALLOW LANDSLIDES ; DURATION CONTROL ; INITIATION ; COLORADO
Language英语
Quartile2区
TOP
WOS SubjectEngineering, Geological ; Geosciences, Multidisciplinary
WOS IDWOS:000369433900003
Funding OrganizationNational Natural Science Foundation(41301008) ; Key Deployment Project of Chinese Academy of Sciences(KZZD-EW-05-01) ; National Key Technologies R&D Program of China(2012BAK10B04)
Citation statistics
Cited Times:23[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/15086
Collection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
Affiliation1.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
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
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.
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