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dc.contributor.authorIverson, Richard M.
dc.contributor.authorGeorge, David L.
dc.date.accessioned2019-08-27T20:51:41Z
dc.date.accessioned2022-02-02T14:38:53Z
dc.date.available2019-08-27T20:51:41Z
dc.date.available2022-02-02T14:38:53Z
dc.date.issued2019
dc.identifier.urihttps://hdl.handle.net/11124/173241
dc.identifier.urihttp://dx.doi.org/10.25676/11124/173241
dc.description.abstractDebris-flow experiments and models commonly use “hot-start” initial conditions in which downslope motion begins when a large force imbalance is abruptly imposed. By contrast, initiation of natural debris flows almost invariably results from small perturbations of static force balances that apply to debris masses poised in steep channels or on steep slopes. Models that neglect these static balances may violate physical law. Here we assess how the effects of hot starts are manifested in physical experiments, analytical dam-break models, and numerical models in which frictional resistance is too small to satisfy static force balances in debris-flow source areas. We then outline a numerical modeling framework that avoids use of hot starts. In this framework an initial static force balance is gradually perturbed by increasing pore-fluid pressure that may trigger the onset of debris motion. Subsequent increases in pore-fluid pressure, driven by debris motion, may then reduce the debris frictional strength, leading to high flow mobility.
dc.format.mediumborn digital
dc.format.mediumproceedings (reports)
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado School of Mines. Arthur Lakes Library
dc.relation.ispartofSeventh International Conference on Debris-Flow Hazards Mitigation - Proceedings
dc.relation.ispartofAssociation of Environmental and Engineering Geologists; special publication 28
dc.rightsCopyright of the original work is retained by the authors.
dc.sourceContained in: Proceedings of the Seventh International Conference on Debris-Flow Hazards Mitigation, Golden, Colorado, USA, June 10-13, 2019, https://hdl.handle.net/11124/173051
dc.subjectdebris flow
dc.subjectnumerical model
dc.subjecthot start
dc.subjectinitial conditions
dc.subjectdam break
dc.subjectexperiments
dc.titleValid debris-flow models must avoid hot starts
dc.typeText
dc.publisher.originalAssociation of Environmental and Engineering Geologists


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