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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
Volume258Pages:UNSP 105134
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.
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WOS IDWOS:000483909000010
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Document Type期刊论文
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
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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.
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