IMHE OpenIR  > 山地灾害与地表过程重点实验室
Rainfall intensity-duration threshold and erosion competence of debris flows in four areas affected by the 2008 Wenchuan earthquake
Ma, Chao1; Wang, Yujie1; Hu, Kaiheng2; Du, Cui3; Yang, Wentao1
Corresponding AuthorYujieWang
2017-04-01
Source PublicationGEOMORPHOLOGY
ISSN0169-555X
Volume282Pages:85-95
SubtypeArticle
Abstract

Debris flows in the Wenchuan seismic region have caused human casualties and severe damage to local infrastructure. Consequently, the triggering rainfall threshold and erosion capability of post-quake debris flows has become an important research topic worldwide. In this study, we analyze five years of rainstorms and debris flow data from four typical earthquake-hit regions in order to examine the local rainfall intensity duration (ID) thresholds and debris supply conditions. It was found that debris flow events in the four seismic areas exhibited different I-D thresholds, related to local mean annual hourly precipitation and debris flow supply conditions. The I-D thresholds, normalized by mean annual maximum hourly rainfall, illustrate that post-quake rainfall thresholds were reduced by at least 30% compared to pre-quake levels. Regression analysis revealed a clear linear relationship between the debris supply condition and the empirical coefficient, a, of the I-D equation. This means that rainfall thresholds of post-quake debris flows in different areas are distinctive and are strongly affected by sediment volume. Different relationships between the entrainment rate and the debris volume per watershed area and its product with the channel gradient illustrate that stream sediments in Yingxiu and Dujiangyan are more eroded, and that local debris flows might persist over a shorter time than in Qingping and Beichuan in the future. Finally, debris flows in the studied area exhibit no tendency of reduction in erosion competence entrainment rate, as found in Taiwan, which might be indicative of a higher entrainment rate persisting for a longer time. (C) 2017 Elsevier B.V. All rights reserved.

KeywordDebris Flow Rainfall Threshold Debris Supply Wenchuan Earthquake
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.geomorph.2017.01.012
WOS Subject ExtendedPhysical Geography ; Geology
Indexed BySCI
WOS KeywordSHALLOW LANDSLIDES ; BURNED AREAS ; INITIATION ; VOLUME ; CHINA ; MOBILIZATION ; COLORADO ; RUNOFF ; TAIWAN ; MODEL
Language英语
Quartile2区
TOP
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary
WOS IDWOS:000395959600008
Funding OrganizationNational Basic Research Program of China (973 Program)(2015CB452704) ; Fundamental Research Funds for the Central Universities(2016ZCQ06 ; 2015ZCQ-SB-01)
Citation statistics
Cited Times:31[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/18585
Collection山地灾害与地表过程重点实验室
Affiliation1.Beijing Forestry Univ, Key Lab State Forestry Adm Soil & Water Conservat, Beijing 100083, Peoples R China
2.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Hazards & Earth Surface Proc, Chengdu 610041, Peoples R China
3.Henan Univ Sci & Technol, Sch Civil Engn, Luoyang 471023, Peoples R China
Recommended Citation
GB/T 7714
Ma, Chao,Wang, Yujie,Hu, Kaiheng,et al. Rainfall intensity-duration threshold and erosion competence of debris flows in four areas affected by the 2008 Wenchuan earthquake[J]. GEOMORPHOLOGY,2017,282:85-95.
APA Ma, Chao,Wang, Yujie,Hu, Kaiheng,Du, Cui,&Yang, Wentao.(2017).Rainfall intensity-duration threshold and erosion competence of debris flows in four areas affected by the 2008 Wenchuan earthquake.GEOMORPHOLOGY,282,85-95.
MLA Ma, Chao,et al."Rainfall intensity-duration threshold and erosion competence of debris flows in four areas affected by the 2008 Wenchuan earthquake".GEOMORPHOLOGY 282(2017):85-95.
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