IMHE OpenIR  > Journal of Mountain Science  > Journal of Mountain Science-2010  > Vol7 No.3
Slope debris flows in the Wenchuan Earthquake area
Li Yanfu; Wang Zhaoyin; Shi Wenjing; Wang Xuzhao
Corresponding AuthorWang, ZY
AbstractAvalanches and landslides, induced by the Wenchuan Earthquake on May 12, 2008, resulted in a lot of disaggregated, solid material on slopes that could be readily mobilized as source material for debris flows. Rainstorms triggered numerous slope debris flows with great damage to highways and rivers over the subsequent two years. Slope debris flows (as opposed to channelized debris flows) are defined as phenomena in which high-concentration mixtures of debris and water flow down slopes for short distances to highways and river banks. Based on field investigations and measurements of 19 slope debris flows, their main characteristics and potential mitigation strategies were studied. High rainfall intensity is the main triggering factor. Critical rainfall intensities for simultaneous occurrence of single, several and numerous slope debris flow events were 20 mm/day, 30mm/day, and 90 mm/day, respectively. Field investigations also revealed that slope debris flows consist of high concentrations of cobbles, boulders and gravel. They are two-phase debris flows. The liquid phase plays the role of lubrication instead of transporting medium. Solid particles collide with each other and consume a lot of energy. The velocities of slope debris flows are very low, and their transport distances are only several tens of meters. Slope debris flows may be controlled by construction of drainage systems and by reforestation.
KeywordSlope Debris Flow Rainfall Intensity Wenchuan Earthquake Landslide Avalanche
Document Type期刊论文
CollectionJournal of Mountain Science_Journal of Mountain Science-2010_Vol7 No.3
Recommended Citation
GB/T 7714
Li Yanfu,Wang Zhaoyin,Shi Wenjing,et al. Slope debris flows in the Wenchuan Earthquake area[J]. JOURNAL OF MOUNTAIN SCIENCE,2010,7(3):226–233.
APA Li Yanfu,Wang Zhaoyin,Shi Wenjing,&Wang Xuzhao.(2010).Slope debris flows in the Wenchuan Earthquake area.JOURNAL OF MOUNTAIN SCIENCE,7(3),226–233.
MLA Li Yanfu,et al."Slope debris flows in the Wenchuan Earthquake area".JOURNAL OF MOUNTAIN SCIENCE 7.3(2010):226–233.
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