Identifying post-earthquake debris flow hazard using Massflow

doi:10.1016/j.enggeo.2019.05.011

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 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, Xuanmei 4,5
刊名	ENGINEERING GEOLOGY
	2019-08-14
卷号	258 页码:10
ISSN号	0013-7952
DOI	10.1016/j.enggeo.2019.05.011
通讯作者	Horton, Alexander J.(Alexander.Horton@Aalto.fi)
英文摘要	Catastrophic 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.
资助项目	Newton Fund ; Natural Environmental Research Council ; Economic and Social Research Council ; National Science Foundation for China[NE/N012240/1]
WOS关键词	2008 WENCHUAN EARTHQUAKE ; ENTRAINMENT ; MODEL ; PROPAGATION ; LANDSLIDES ; AVALANCHES ; RUNOUT
WOS研究方向	Engineering ; Geology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000483909000010
资助机构	Newton Fund ; Natural Environmental Research Council ; Economic and Social Research Council ; National Science Foundation for China
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/26966]
专题	成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室成都山地灾害与环境研究所_山地灾害与地表过程重点实验室
通讯作者	Horton, Alexander J.
作者单位	1.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
推荐引用方式 GB/T 7714	Horton, Alexander J.,Hales, Tristram C.,Ouyang, Chaojun,et al. Identifying post-earthquake debris flow hazard using Massflow[J]. ENGINEERING GEOLOGY,2019,258:10.
APA	Horton, Alexander J.,Hales, Tristram C.,Ouyang, Chaojun,&Fan, Xuanmei.(2019).Identifying post-earthquake debris flow hazard using Massflow.ENGINEERING GEOLOGY,258,10.
MLA	Horton, Alexander J.,et al."Identifying post-earthquake debris flow hazard using Massflow".ENGINEERING GEOLOGY 258(2019):10.