IMHE OpenIR  > 山地表生过程与生态调控重点实验室
Identifying post-earthquake debris flow hazard using Massflow
Horton Alexander J.1,2,3; Hales Tristram C.1,2; Ouyang Chaojun4,5; Fan Xuanmei4,5
2019
Source PublicationENGINEERING GEOLOGY
ISSN0013-7952
EISSN1872-6917
Volume258Pages:UNSP 105134
SubtypeArticle
Contribution Rank4
AbstractCatastrophic debris flows are common after large earthquakes and pose a significant risk for recovering communities. The depositional volume of these large debris flows is often much greater than the initiation volume, suggesting that bulking of the flow plays an important role in determining their volume, speed, and runout distance. Observations from recent earthquakes have driven progress in understanding the relationship between triggering rainfall events and the timing of post earthquake debris flows. However, we lack an adequate mechanism for quantifying bulking and applying it within a hazard context. Here we apply a 2D dynamic debris flow model (Massflow) that incorporates a process-based expression of basal entrainment to understand how debris flow bulking may occur within post earthquake catchments and develop hazard maps. Focussing on catchments in the epicentral area of the 2008 M-w 7.9 Wenchuan Earthquake, we first parameterised the model based on a large debris flow that occurred within the Hongchun catchment, before applying the calibrated model to adjoining catchments. A model sensitivity analysis identified three main controls on debris flow bulking; the saturation level of entrainable material along the flow pathway, and the size and position of initial mass failures. The model demonstrates that the difference between small and very large debris flows occur across a narrow range of pore-water ratios (lambda). Below lambda = 0.65 flows falter at the base of hillslopes and come to rest in the valley bottom, above lambda = 0.70 they build sufficient mass and momentum to sustain channelised flow and transport large volumes of material beyond the valley confines. Finally, we applied the model across different catchments to develop hazard maps that demonstrate the utility of Massflow in post-earthquake planning within the Wenchuan epicentral region.
DOI10.1016/j.enggeo.2019.05.011
Indexed BySCI
Language英语
WOS IDWOS:000483909000010
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/26966
Collection山地表生过程与生态调控重点实验室
山地灾害与地表过程重点实验室
Corresponding AuthorHorton Alexander J.
Affiliation1.Cardiff Univ, Sch Earth & Ocean Sci, Cardiff CF10 3AT, S Glam, Wales;
2.Cardiff Univ, Sustainable Pl Res Inst, Cardiff CF10 3AT, S Glam, Wales;
3.Aalto Univ, Water & Dev Res Grp, Espoo, Finland;
4.Chinese Acad Sci, Key Lab Mt Hazards & Surface Proc, Chengdu 610041, Peoples R China;
5.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Sichuan, Peoples R China
Recommended Citation
GB/T 7714
Horton Alexander J.,Hales Tristram C.,Ouyang Chaojun,et al. Identifying post-earthquake debris flow hazard using Massflow[J]. ENGINEERING GEOLOGY,2019,258:UNSP 105134.
APA Horton Alexander J.,Hales Tristram C.,Ouyang Chaojun,&Fan Xuanmei.(2019).Identifying post-earthquake debris flow hazard using Massflow.ENGINEERING GEOLOGY,258,UNSP 105134.
MLA Horton Alexander J.,et al."Identifying post-earthquake debris flow hazard using Massflow".ENGINEERING GEOLOGY 258(2019):UNSP 105134.
Files in This Item:
File Name/Size DocType Version Access License
1-s2.0-S001379521831(2720KB)期刊论文出版稿开放获取CC BY-NC-SAView Application Full Text
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Horton Alexander J.]'s Articles
[Hales Tristram C.]'s Articles
[Ouyang Chaojun]'s Articles
Baidu academic
Similar articles in Baidu academic
[Horton Alexander J.]'s Articles
[Hales Tristram C.]'s Articles
[Ouyang Chaojun]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Horton Alexander J.]'s Articles
[Hales Tristram C.]'s Articles
[Ouyang Chaojun]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: 1-s2.0-S0013795218316545-main.pdf
Format: Adobe PDF
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.