IMHE OpenIR  > Journal of Mountain Science  > Journal of Mountain Science-2017  > Vol14 No.1
A catastrophic debris flow in the Wenchuan Earthquake area, July 2013: characteristics, formation, and risk reduction
HU Tao; HUANG Run-qiu
Corresponding AuthorHU Tao
2017-01
Source PublicationJournal of Mountain Science
ISSN1672-6316
Volume14Issue:1Pages:15-30
Subtype期刊论文
AbstractIn the Wenchuan Earthquake area, many co-seismic landslides formed blocking-dams in debris flow channels. This blocking and bursting of landslide dams amplifies the debris flow scale and results in severe catastrophes. The catastrophic debris flow that occurred in Qipan gully (Wenchuan, Southwest China) on July 11, 2013 was caused by intense rainfall and upstream cascading bursting of landslide dams. To gain an understanding of the processes of dam bursting and subsequent debris flow scale amplification effect, we attempted to estimate the bursting debris flow peak discharges along the main gully and analyzed the scale amplification process. The results showed that the antecedent and triggering rainfalls for 11 July debris flow event were 88.0 mm and 21.6 mm, respectively. The event highlights the fact that lower rainfall intensity can trigger debris flows after the earthquake. Calculations of the debris flow peak discharge showed that the peak discharges after the dams-bursting were 1.17–1.69 times greater than the upstream peak discharge. The peak discharge at the gully outlet reached 2553 m3/s which was amplified by 4.76 times in comparison with the initial peak discharge in the upstream. To mitigate debris flow disasters, a new drainage channel with a trapezoidal V-shaped cross section was proposed. The characteristic lengths (h1 and h2) under optimal hydraulic conditions were calculated as 4.50 m and 0.90 m, respectively.
KeywordDisaster Characteristics Formation Mechanisms Risk Reduction Debris Flow Wenchuan Earthquake Blocking Dam
DOI10.1007/s11629-016-3965-8
Indexed BySCI
Language英语
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/18309
CollectionJournal of Mountain Science_Journal of Mountain Science-2017_Vol14 No.1
Recommended Citation
GB/T 7714
HU Tao,HUANG Run-qiu. A catastrophic debris flow in the Wenchuan Earthquake area, July 2013: characteristics, formation, and risk reduction[J]. Journal of Mountain Science,2017,14(1):15-30.
APA HU Tao,&HUANG Run-qiu.(2017).A catastrophic debris flow in the Wenchuan Earthquake area, July 2013: characteristics, formation, and risk reduction.Journal of Mountain Science,14(1),15-30.
MLA HU Tao,et al."A catastrophic debris flow in the Wenchuan Earthquake area, July 2013: characteristics, formation, and risk reduction".Journal of Mountain Science 14.1(2017):15-30.
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