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dc.contributor.authorLiu, Fangzhou
dc.contributor.authorFrost, J. David
dc.contributor.authorXu, Qiang
dc.contributor.authorHuang, Runqiu
dc.date.accessioned2019-08-14T17:13:56Z
dc.date.accessioned2022-02-02T14:38:52Z
dc.date.available2019-08-14T17:13:56Z
dc.date.available2022-02-02T14:38:52Z
dc.date.issued2019
dc.identifier.urihttps://hdl.handle.net/11124/173178
dc.identifier.urihttp://dx.doi.org/10.25676/11124/173178
dc.description.abstractPoorly sorted loose granular materials deposited by the coseismic landslides in the 2008 Wenchuan Earthquake provided abundant source material for debris flows to occur during saturation and agitation by rainfall as well as surface and groundwater flow. Debris flows in southwest China are concentrated in the annual monsoon season when substantial precipitation occurs and have resulted in catastrophic damage to downstream regions. With debris-flow susceptibility increasing in regions affected by mega-earthquakes, mitigation systems are considered as critical infrastructures, the performance and resilience of which are vital to the local communities. In this paper, we present 1) the analysis on rainfall intensity-duration (I-D) thresholds, Rainfall Index (RI), Rainfall Triggering Index (RTI) and characteristics of the debris flows that occurred in the gullies located in three watersheds affected by the Wenchuan Earthquake, and 2) the evaluation of the performance of both conventional and some novel mitigation systems deployed in these gullies. Sharp decreases in the associated rainfall thresholds were found in the gullies after the earthquake; however, the level of increase in the rainfall thresholds is highly site- and system-dependent. Most of the existing debris-flow mitigation systems exhibited fair performance yet insufficient resilience to the impact. Notwithstanding the large amount of source materials available to be mobilized in debris flows and the intense surface run-off, many conventional mitigation structures required constant maintenance after each event and even reconstruction after the monsoon season.
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.subjectmitigation system
dc.subjectrainfall thresholds
dc.subjectWenchuan earthquake
dc.subjectresilience
dc.titleDebris flows and mitigation systems after the 2008 Wenchuan earthquake
dc.typeText
dc.publisher.originalAssociation of Environmental and Engineering Geologists


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