IMHE OpenIR  > Journal of Mountain Science  > Journal of Mountain Science-2017  > Vol14 No.4
Mechanisms involved in triggering debris flows within a cohesive gravel soil mass on a slope: a case in SW China
Chen Ning-sheng1,2; Zhu Yun-hua1,2,3,4; Huang Qi5; Iqbal, Javed3,6; Deng Ming-feng3; He Na1,2,3
Corresponding AuthorCHEN Ning-sheng

The triggering mechanisms of debris flows were explored in the field using artificial rainfall experiments in two gullies, Dawazi Gully and Aizi Gully, in Yunnan and Sichuan Provinces, China, respectively. The soils at both sites are bare, loose and cohesive gravel-dominated. The results of a direct shear test, rheological test and back-analysis using soil mass stability calculations indicate that the mechanisms responsible for triggering debris flows involved the decreases in static and dynamic resistance of the soil. The triggering processes can be divided into 7 stages: rainfall infiltration, generation of excess runoff, high pore water pressure, surface erosion, soil creep, soil slipping, debris flow triggering and debris flow increment. In addition, two critical steps are evident: (i) During the process of the soil mass changing from a static to a mobile state, its cohesion decreased sharply (e.g., the cohesion of the soil mass in Dawazi Gully decreased from 0.520 to 0.090 kPa, a decrease of 83%). This would have reduced the soil strength and the kinetic energy during slipping, eventually triggered the debris flow. (ii) When the soil mass began to slip, the velocity and the volume increment of the debris flow fluctuated as a result of the interaction of soil resistance and the sliding force. The displaced soil mass from the source area of the slope resulted in the deposition of a volume of soil more than 7 - 8 times greater than that in the source area.

KeywordDebris Flow Cohesive Gravel Soil Triggering Mechanism Slip Soil Erosion
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
WOS Subject ExtendedEnvironmental Sciences & Ecology
Indexed BySCI
WOS SubjectEnvironmental Sciences
WOS IDWOS:000399086200001
Funding OrganizationNational Natural Science Foundation of China(41190084 ; Technology Program of Housing and Urban-Rural Development of P.R. China(2015-K6-016) ; Education Department of Sichuan Province, China(15ZA0053) ; 41671112 ; 41661134012)
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Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
CollectionJournal of Mountain Science_Journal of Mountain Science-2017_Vol14 No.4
Affiliation1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Hazards & Surface Proc, Chengdu 610041, Peoples R China
2.Minist Water Resources, Chengdu 610041, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Southwest Petr Univ, Chengdu 610500, Peoples R China
5.Southwest Elect Power Design Inst CO LTD, Chengdu 610021, Peoples R China
6.COMSATS Inst Informat Technol, Dept Earth Sci, Abbottabad 22060, Pakistan
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
Chen Ning-sheng,Zhu Yun-hua,Huang Qi,et al. Mechanisms involved in triggering debris flows within a cohesive gravel soil mass on a slope: a case in SW China[J]. JOURNAL OF MOUNTAIN SCIENCE,2017,14(4):611-620.
APA Chen Ning-sheng,Zhu Yun-hua,Huang Qi,Iqbal, Javed,Deng Ming-feng,&He Na.(2017).Mechanisms involved in triggering debris flows within a cohesive gravel soil mass on a slope: a case in SW China.JOURNAL OF MOUNTAIN SCIENCE,14(4),611-620.
MLA Chen Ning-sheng,et al."Mechanisms involved in triggering debris flows within a cohesive gravel soil mass on a slope: a case in SW China".JOURNAL OF MOUNTAIN SCIENCE 14.4(2017):611-620.
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