IMHE OpenIR  > 山地灾害与地表过程重点实验室
Characteristics of earthquake-triggered landslides and post-earthquake debris flows in Beichuan County
Zhuang Jianqi1,2,3; Cui Peng1,2; Hu Kaiheng1,2; Chen Xiaoqing1,2; Ge Yonggang1,2
Corresponding AuthorCui, P(崔鹏)
2010
Source PublicationJOURNAL OF MOUNTAIN SCIENCE
ISSN1672-6316
EISSN1993-0321
Volume7Issue:3Pages:246-254
SubtypeArticle
AbstractField investigations and aerial photography after the earthquake of May 12, 2008 show a large number of geo-hazards in the zone of extreme earthquake effects. In particular, landslides and debris flows, the geo-hazards that most threaten post-disaster reconstruction, are widely distributed. We describe the characteristics of these geo-hazards in Beichuan County using high-resolution remote sensing of landslide distribution, and the relationships between the area and volume of landslides and the peak-discharges of debris flows both pre- and post-earthquake. The results show: 1) The concentration (defined as the number of landslide sources per unit area: Lc) of earthquaketriggered landslides is inversely correlated with distance from the earthquake (D(F)) fault. The relationship is described by the following equation: Lc = 3.2264exp(-0.0831D(F)) (R(2) = 0.9246); 2) 87 % of the earthquake-triggered landslides were less than 15x10(4) m(2) in area, and these accounted only for 50% of the total area; 84% of the landslide volumes were less than 60x10(4) m(3), and these accounted only for 50% of the total volume. The probability densities of the area and volume distributions are correlated: landslide abundance increases with landslide area and volume up to maximum values of 5x10(4) m(2) and 30x10(4) m(3), respectively, and then decreases exponentially. 3) The area (AL) and volume (VL) of earthquake-triggered landslides are correlated as described with the following equation: VL=6.5138AL(1.0227) (R(2) = 0.9131); 4) Characteristics of the debris flows changed after the earthquake because of the large amount of landslide material deposited in the gullies. Consequently, debris flow peak-discharge increased following the earthquake as described with the following equation: Vpost = 0.8421Vpre(1.0972) (R(2) = 0.9821) (Vpre is the peak discharge of pre-earthquake flows and the Vpost is the peak discharge of post-earthquake flows). We obtained the distribution of the landslides based on the above analyses, as well as the magnitude of both the landslides and the post-earthquake debris flows. The results can be useful for guiding post-disaster reconstruction and recovery efforts, and for the future mitigation of these geo-hazards. However, the equations presented are not recommended for use in site-specific designs. Rather, we recommend their use for mapping regional seismic landslide hazards or for the preliminary, rapid screening of sites.
Keyword5.12 Earthquake Landslide Debris Flow Magnitude Beichuan County
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
DOI10.1007/s11629-010-2016-0
WOS Subject ExtendedEnvironmental Sciences & Ecology
Indexed BySCI
WOS KeywordSTATISTICAL-ANALYSIS ; CALIFORNIA ; BASIN
Language英语
Quartile4区
TOP
WOS SubjectEnvironmental Sciences
WOS IDWOS:000280555900005
Funding OrganizationNational Key Fundamental Research Program of China (973)(2008CB425802) ; Chinese Academy Sciences(KZCX2-YW-Q03-5)
Citation statistics
Cited Times:26[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/5588
Collection山地灾害与地表过程重点实验室
Affiliation1.Chinese Acad Sci, Key Lab Mt Hazards & Land Surface Proc, Chengdu 610041, Peoples R China
2.Chinese Acad Sci, Inst Mt Hazards & Environm, 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
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GB/T 7714
Zhuang Jianqi,Cui Peng,Hu Kaiheng,et al. Characteristics of earthquake-triggered landslides and post-earthquake debris flows in Beichuan County[J]. JOURNAL OF MOUNTAIN SCIENCE,2010,7(3):246-254.
APA Zhuang Jianqi,Cui Peng,Hu Kaiheng,Chen Xiaoqing,&Ge Yonggang.(2010).Characteristics of earthquake-triggered landslides and post-earthquake debris flows in Beichuan County.JOURNAL OF MOUNTAIN SCIENCE,7(3),246-254.
MLA Zhuang Jianqi,et al."Characteristics of earthquake-triggered landslides and post-earthquake debris flows in Beichuan County".JOURNAL OF MOUNTAIN SCIENCE 7.3(2010):246-254.
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