IMHE OpenIR
Effects of loose deposits on debris flow processes in the Aizi Valley, southwest China
Liu Mei1,2; Zhang Yong1,2; Tian Shu-feng1,2; Chen Ning-sheng1; Mahfuzr Rahman1,3; Javed Iqbal1,4
Corresponding AuthorChen Ning-sheng(chennsh@imde.ac.cn)
2020
Source PublicationJOURNAL OF MOUNTAIN SCIENCE
ISSN1672-6316
EISSN1993-0321
Volume17Issue:1Pages:156-172
SubtypeArticle
Contribution Rank1
AbstractLoose deposits, rainfall and topography are three key factors that triggering debris flows. However, few studies have investigated the effects of loose deposits on the whole debris flow process. On June 28, 2012, a catastrophic debris flow occurred in the Aizi Valley, resulting in 40 deaths. The Aizi Valley is located in the Lower Jinsha River, southwestern Sichuan Province, China. The Aizi Valley debris flow has been selected as a case for addressing loose deposits effects on the whole debris flow process through remote sensing, field investigation and field experiments. Remote sensing interpretation and laboratory experiments were used to obtain the distribution and characteristics of the loose deposits, respectively. A field experiment was conducted to explore the mechanics of slope debris flows, and another field investigation was conducted to obtain the processes of debris flow formation, movement and amplification. The results showed that loose deposits preparation, slope debris flow initiation, gully debris flow confluence and valley debris flow amplification were dominated by the loose deposits. Antecedent droughts and earthquake activities may have increased the potential for loose soil sources in the Aizi Valley, which laid the foundation for debris flow formation. Slope debris flow initiated under rainfall, and the increase in the water content as well as the pore water pressure of the loose deposits were the key factors affecting slope failure. The nine gully debris flows converged in the valley, and the peak discharge was amplified 3.3 times due to a blockage and outburst caused by a large boulder. The results may help in predicting and assessing regional debris flows in dry-hot and seismic-prone areas based on loose deposits, especially considering large boulders.
KeywordAizi Valley Loose deposits Debris flow process Slope debris flow Boulder blockage Discharge amplification
DOI10.1007/s11629-019-5388-9
Indexed BySCI
WOS KeywordWENCHUAN EARTHQUAKE AREA ; SICHUAN PROVINCE ; LANDSLIDE DAMS ; HAZARD PREDICTION ; YIELD-STRESS ; DISCHARGE ; SUSCEPTIBILITY ; MECHANISM ; DROUGHTS ; PLATEAU
Language英语
Funding ProjectNational Natural Science Foundation of China[41861134008] ; National Natural Science Foundation of China[41601476] ; National Key Research and Development Program of China[2018YFC1505202] ; 135 Strategic Program of the IMHE, CAS[SDS-135-1705]
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
WOS IDWOS:000512076900012
Funding OrganizationNational Natural Science Foundation of China ; National Key Research and Development Program of China ; 135 Strategic Program of the IMHE, CAS
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/33878
Collection中国科学院水利部成都山地灾害与环境研究所
Corresponding AuthorChen Ning-sheng
Affiliation1.Key Lab of Mountain Hazards and Surface Processes, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;
2.University of Chinese Academy of Sciences, Beijing 100049, China;
3.Department of Civil Engineering, International University of Business Agriculture and Technology, Dhaka 1230, Bangladesh;
4.Department of geology, The university of Haripur , Haripur 22620, Pakistan
Recommended Citation
GB/T 7714
Liu Mei,Zhang Yong,Tian Shu-feng,et al. Effects of loose deposits on debris flow processes in the Aizi Valley, southwest China[J]. JOURNAL OF MOUNTAIN SCIENCE,2020,17(1):156-172.
APA Liu Mei,Zhang Yong,Tian Shu-feng,Chen Ning-sheng,Mahfuzr Rahman,&Javed Iqbal.(2020).Effects of loose deposits on debris flow processes in the Aizi Valley, southwest China.JOURNAL OF MOUNTAIN SCIENCE,17(1),156-172.
MLA Liu Mei,et al."Effects of loose deposits on debris flow processes in the Aizi Valley, southwest China".JOURNAL OF MOUNTAIN SCIENCE 17.1(2020):156-172.
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