IMHE OpenIR  > Journal of Mountain Science  > Journal of Mountain Science-2015  > Vol12 No.1
Mechanism of Downcutting Erosion of Debris Flow over a Movable Bed
Pan Hua-li1; Huang Jiang-cheng2; Ou Guo-qiang1

The phenomenon of debris flow is intermediate between mass movement and solid transport. Flows can be sudden, severe and destructive. Understanding debris flow erosion processes is the key to providing geomorphic explanations, but progress has been limited because the physical-mechanical properties, movement laws and erosion characteristics are different from those of sediment-laden flow. Using infinite slope theory, this research examines the process and mechanism of downcutting erosion over a moveable bed in a viscous debris flow gully. It focuses specifically on the scour depth and the critical slope for viscous debris flow, and formulas for both calculations are presented. Both scour depth and the critical conditions of downcutting erosion are related to debris flow properties (sand volume concentration and flow depth) and gully properties (longitudinal slope, viscous and internal friction angle of gully materials, and coefficient of kinetic friction). In addition, a series of flume experiments was carried out to characterize the scouring process of debris flows with different properties. The calculated values agreed well with the experimental data. These theoretical formulas are reasonable, and using infinite slope theory to analyze down cutting erosion from viscous debris flow is feasible.

KeywordDebris Flow Down Cutting Erosion Infinite Slope Theory Critical Conditions Flume Experiments
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
WOS Subject ExtendedEnvironmental Sciences & Ecology
Indexed BySCI
WOS KeywordGully Erosion ; Channels ; Sills
WOS SubjectEnvironmental Sciences
WOS IDWOS:000348918000020
Funding OrganizationNational Natural Science Foundation of China(50979103 ; 40901007)
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
CollectionJournal of Mountain Science_Journal of Mountain Science-2015_Vol12 No.1
Affiliation1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Hazards & Earth Surface Proc, Chengdu 610041, Peoples R China
2.Yunnan Univ, Asian Int Rivers Ctr, Kunming 650091, 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
Recommended Citation
GB/T 7714
Pan Hua-li,Huang Jiang-cheng,Ou Guo-qiang. Mechanism of Downcutting Erosion of Debris Flow over a Movable Bed[J]. JOURNAL OF MOUNTAIN SCIENCE,2015,12(1):243-250.
APA Pan Hua-li,Huang Jiang-cheng,&Ou Guo-qiang.(2015).Mechanism of Downcutting Erosion of Debris Flow over a Movable Bed.JOURNAL OF MOUNTAIN SCIENCE,12(1),243-250.
MLA Pan Hua-li,et al."Mechanism of Downcutting Erosion of Debris Flow over a Movable Bed".JOURNAL OF MOUNTAIN SCIENCE 12.1(2015):243-250.
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