IMHE OpenIR  > 山地灾害与地表过程重点实验室
Spatial features of debris flows and their rainfall thresholds in the Wenchuan earthquake-affected area
Guo, Xiaojun1,2,3; Cui, Peng1,2,4; Li, Yong1,2; Zhang, Jianqiang1,2; Ma, Li5; Mahoney, William B.6
Corresponding AuthorCui, Peng
2016
Source PublicationLANDSLIDES
ISSN1612-510X
EISSN1612-5118
Volume13Issue:5Pages:1215-1229
SubtypeArticle
AbstractThe 2008 Wenchuan earthquake greatly altered the thresholds for rainfall-triggered debris flows within the affected area. Debris flows were widely and densely distributed, and they exhibited a range of differing local rainfall thresholds. This study looked at 518 debris flow events that occurred post-earthquake in order to analyze their spatial characteristics. The duration D (in h) and the average rainfall intensity I (in mm/h) that triggered the debris flows were determined for 252 of these events in order to analyze the spatial features of rainfall thresholds. Results show that 49 % of debris flows occurred in the highest-intensity seismic zone, 58 % occurred within 10 km of active faults, and 49 % occurred in areas with humid climate. Rainfall thresholds in these three regions were persistently lower than others. Moreover, debris flows were most frequent in watersheds smaller than 5 km(2), and rainfall thresholds tended to decrease with a decrease in watershed size. Given the abundant loose materials available throughout the study area, 11 extreme debris flow-prone sub-regions were selected to illustrate the spatial features of rainfall thresholds in relation to local climate conditions. The lowest and highest I-D thresholds in the sub-regions examined were I = 5.94D (-0.70) (2 < D < 53) and I = 21.4D (-0.58) (3 < D < 50), respectively. The lowest and mean rainfall intensities needed to trigger debris flows were power-related with the local maximum 1- and 24-h rainfall. By normalizing the rainfall intensity (I) by mean annual precipitation (MAP), the I (MAP)-D thresholds were determined. Normalized results showed that the lowest and highest I (MAP)-D thresholds were I (MAP) = 0.0034D (-0.55) (2 < D < 53) and I (MAP) = 0.0090D (-0.40) (3 < D < 51), respectively. Such results are useful for debris flow forecasting based on empirical rainfall thresholds and have implications for hazard and risk assessment in this region.
KeywordDebris Flow I-d Relationship Spatial Distribution Rainfall Wenchuan Earthquake
WOS HeadingsScience & Technology ; Technology ; Physical Sciences
DOI10.1007/s10346-015-0608-z
WOS Subject ExtendedEngineering ; Geology
Indexed BySCI
WOS KeywordSHALLOW LANDSLIDES ; DURATION CONTROL ; CHINA ; INTENSITY ; INITIATION ; UPDATE ; NEPAL
Language英语
Quartile2区
TOP
WOS SubjectEngineering, Geological ; Geosciences, Multidisciplinary
WOS IDWOS:000385174600026
Funding OrganizationNational Natural Science Foundation(41301008) ; Key Deployment Project of the Chinese Academy of Sciences(KZZD-EW-05-01) ; National Key Technologies R&D Program of China(2012BAK10B04)
Citation statistics
Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/18127
Collection山地灾害与地表过程重点实验室
Affiliation1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Hazards, Chengdu 610041, Peoples R China
2.Asian Network Debris Flow, Chengdu 610041, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Chinese Acad Sci, Ctr Excellencein Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
5.Sichuan Meteorol Adm, Chengdu 610072, Peoples R China
6.Int Eros Control Assoc, Denver, CO 80207 USA
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. Spatial features of debris flows and their rainfall thresholds in the Wenchuan earthquake-affected area[J]. LANDSLIDES,2016,13(5):1215-1229.
APA Guo, Xiaojun,Cui, Peng,Li, Yong,Zhang, Jianqiang,Ma, Li,&Mahoney, William B..(2016).Spatial features of debris flows and their rainfall thresholds in the Wenchuan earthquake-affected area.LANDSLIDES,13(5),1215-1229.
MLA Guo, Xiaojun,et al."Spatial features of debris flows and their rainfall thresholds in the Wenchuan earthquake-affected area".LANDSLIDES 13.5(2016):1215-1229.
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