IMHE OpenIR  > 山地灾害与地表过程重点实验室
Model for Dilution Process of Landslide Triggered Debris Flows -A Case in the Guanba River, Southeastern Tibetan Plateau
Jun Li1; Ningsheng Chen2; Javed Iqbal3; Dawei Han4
2018
Source PublicationEARTH SCIENCES RESEARCH JOURNAL
ISSN1794-6190
Volume22Issue:2Pages:103-111
SubtypeArticle
Contribution Rank2
AbstractUnderstanding and modeling the downstream dilution process of a landslide triggered debris flow is the foundation for recognizing the boundary condition and dilution mechanism of this type of debris flow, and this serves as the theoretical basis fur the categorized control of viscous debris flows, diluted debris flows, hyperconcentration flows and flash floods in a drainage basin. In this study, taking as an example a typical debris flow that occurred in the Guanba River on Tibet's southeastern plateau on July 6th, 1998, empirical models are used to calculate the density, water flow discharge, debris flow discharge. average depth of loose materials and channel gradient at 11 cross-sections upstream to downstream in the debris flow. On this basis, the dilution characteristics and debris flow dilution process are analyzed in this study. According to the correlation between the debris flow density and the water-soil ratio and channel gradient, we have established the density evaluation model for the debris flow dilution process, which can predict the dilution process of a landslide triggered debris flow. The study results include the following four aspects: (1) The key factors in the dilution process of landslide triggered debris flows are the water flow discharge. average depth of loose materials and channel gradient. (2) The debris flow dilution characteristics in the Guanba River in 1998 include the occurrence of the debris flow dilution process after a significant increase in the water-soil ratio: an increase in the proportion of fine particles after dilution of the debris flow; and the size distribution of grain is "narrowed". (3) In accordance with the density and dilution characteristics, the debris flow dilution process in the Guanba River can be divided into the upstream viscous debris flow section, midstream and downstream transitional debris flow section and downstream diluted debris flow section. (4) The density evaluation model for the debris flow dilution process is expressed by the Lorentz equation, and this model can reflect the debris flow dilution process such that the debris flow density will decrease gradually with an increase in the water-soil ratio and decrease in channel gradient. The density evaluation model for the debris flow dilution process has been verified by three debris flow cases, which include Gaoqiao Gully, Haizi Valley and Aizi Valley.
KeywordDebris flows Dilution characteristic and process Evaluation model Guanba River Southeastern Tibetan Plateau
DOI10.15446/esrj.v22n2.68177
Indexed BySCI
Language英语
Quartile4区
TOP
WOS IDWOS:000442912200004
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/23776
Collection山地灾害与地表过程重点实验室
Corresponding AuthorNingsheng Chen
Affiliation1.Sichuan University of Science & Engineering, School of Civil Engineering, Sichuan Zigong 643000, China;
2.Key Laboratory of Mountain Hazards and Land Surface Processes, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Sichuan Chengdu 610041, China;
3.Department of Earth Sciences, COMSATS Institute of Information Technology, Abbottabad 22060, Pakistan;
4.Department of Civil Engineering, University of Bristol, Bristol BS81TR, United Kingdom
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
Jun Li,Ningsheng Chen,Javed Iqbal,et al. Model for Dilution Process of Landslide Triggered Debris Flows -A Case in the Guanba River, Southeastern Tibetan Plateau[J]. EARTH SCIENCES RESEARCH JOURNAL,2018,22(2):103-111.
APA Jun Li,Ningsheng Chen,Javed Iqbal,&Dawei Han.(2018).Model for Dilution Process of Landslide Triggered Debris Flows -A Case in the Guanba River, Southeastern Tibetan Plateau.EARTH SCIENCES RESEARCH JOURNAL,22(2),103-111.
MLA Jun Li,et al."Model for Dilution Process of Landslide Triggered Debris Flows -A Case in the Guanba River, Southeastern Tibetan Plateau".EARTH SCIENCES RESEARCH JOURNAL 22.2(2018):103-111.
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