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Rainfall-induced landslides and debris flows in Mengdong Town, Yunnan Province, China
Yang, Hongjuan1,2; Yang, Taiqiang2,3; Zhang, Shaojie2; Zhao, Fuhu4; Hu, Kaiheng2; Jiang, Yuhong2
Source PublicationLANDSLIDES
Contribution Rank1
AbstractOn 2 September 2018, an intense rainstorm swept Mengdong Town in Yunnan Province of China, inducing a serious landslide and debris flow disaster with 10 deaths and 11 missing. Image interpretation, field survey, and slope stability analysis were used to examine the characteristics and initiation mechanism of this hazard. A total of 1774 landslide scars were identified, the area of which occupied 8.26% of the study region. Due to the spatial inhomogeneity of precipitation, these scars mainly concentrated along valleys in the lower part of the study area. Besides, well-forested hillslopes were more prone to landslides, indicating the limited role of trees in stabilizing slopes in extreme rainfall events. The initiation of landslides is mainly attributed to the week cohesion of the saturated clayey sand beneath the root zone, where the tensile resistance of roots was absent, and the increase of positive pore water pressure. Additionally, 288 landslide scars were situated adjacent to roads, demonstrating that the road construction activity had intensified the landslide disaster. Owing to the relatively low mobility of landslides, a considerable portion of landslide debris deposited on the valley floor in smaller watersheds (< 6.03 hm(2)), while the remaining portion entered high-order channels. In these channels, where stream power was relatively large, the woody debris and soil carried by landslides were entrained by streamflow, and debris flows were formed. Moreover, the magnitude of debris flow was amplified by the vertical and lateral erosion of the stream channel.
KeywordShallow landslide Multiple-occurrence regional landslide events Initiation mechanism Spatial distribution Forested slope Stream power
Indexed BySCI ; EI
WOS Research AreaEngineering ; Geology
WOS SubjectEngineering, Geological ; Geosciences, Multidisciplinary
WOS IDWOS:000505357900002
EI Accession NumberAccession number:20200207995622
Citation statistics
Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorZhang, Shaojie
Affiliation1.Chinese Acad Sci, Key Lab Mt Hazards & Earth Surface Proc, Chengdu 610041, Sichuan, Peoples R China;
2.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Sichuan, Peoples R China;
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China;
4.Chongqing Meteorol Observ, Chongqing 401147, 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
Corresponding 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
Yang, Hongjuan,Yang, Taiqiang,Zhang, Shaojie,et al. Rainfall-induced landslides and debris flows in Mengdong Town, Yunnan Province, China[J]. LANDSLIDES,2020,17(4):931-941.
APA Yang, Hongjuan,Yang, Taiqiang,Zhang, Shaojie,Zhao, Fuhu,Hu, Kaiheng,&Jiang, Yuhong.(2020).Rainfall-induced landslides and debris flows in Mengdong Town, Yunnan Province, China.LANDSLIDES,17(4),931-941.
MLA Yang, Hongjuan,et al."Rainfall-induced landslides and debris flows in Mengdong Town, Yunnan Province, China".LANDSLIDES 17.4(2020):931-941.
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