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Initiation process of debris flows on different slopes due to surface flow and trigger-specific strategies for mitigating post-earthquake in old Beichuan County, China
Zhuang, Jian-qi1; Cui, Peng2; Peng, Jian-bing1; Hu, Kai-heng2; Iqbal, Javed3
Corresponding AuthorZhuang, JQ
2013-03-01
Source PublicationENVIRONMENTAL EARTH SCIENCES
ISSN1866-6280
Volume68Issue:5Pages:1391-1403
SubtypeArticle
AbstractThe 12 May 2008 Wenchuan earthquake (Ms 8.0) in China, produced an estimated volume of 28 x 10(8) m(3) loosened material, which led to debris flows after the earthquake. Debris flows are the dominant mountain hazards, and serious threat to lives, properties, buildings, traffic, and post-earthquake reconstruction in the earthquake-hit areas. It is very important to understand the debris flow initiation processes and characteristics, for designing debris flow mitigation. The main objective of this article is to examine the different debris flow initiation processes in order to identify suitable mitigation strategies. Three types of debris flow initiation processes were identified (designated as Types A, B, and C) by field survey and experiments. In "A" type initiation, the debris flow forms as a result of dam failure in the process of rill erosion, slope failure, landslide dam, or dam failure. This type of debris flow occurs at the slope of 10 +/- A 2A degrees, with a high bulk density, and several surges following dam failure. "B" type initiation is the result of a gradual increase in headward down cutting, bank and lateral erosion, and then large amount of loose material interfusion into water flow, which increases the bulk density, and forms the debris flow. This type of debris flow occurs mainly on slopes of 15 +/- A 3A degrees without surges. "C" type debris flow results from slope failures by surface flow, infiltration, loose material crack, slope failure, and fluidization. This type of debris flow occurs mainly on slopes of 21 +/- A 4A degrees, and has several surges of debris flow following slope failure, and a high bulk density. To minimize the hazards from debris flows in areas affected by the Wenchuan earthquake, the erosion control measures, such as the construction of grid dams, slope failure control measures, the construction of storage sediment dams, and the drainage measures, such as construction of drainage ditches are proposed. Based on our results, it is recommend that the control measures should be chosen based on the debris flow initiation type, which affects the peak discharge, bulk density and the discharge process. The mitigation strategies discussed in this paper are based on experimental simulations of the debris flows in the Weijia, Huashiban, and Xijia gullies of old Beichuan city. The results are useful for post-disaster reconstruction and recovery, as well as for preventing similar geohazards in the future.
KeywordDebris Flow Initiation Process Mitigation Strategies Old Beichuan County Wenchuan Earthquake
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine ; Physical Sciences
DOI10.1007/s12665-012-1837-2
WOS Subject ExtendedEnvironmental Sciences & Ecology ; Geology ; Water Resources
Indexed BySCI
WOS KeywordWENCHUAN EARTHQUAKE ; CENTRAL TAIWAN ; RAINFALL ; FAILURE ; IDENTIFICATION ; LANDSLIDES ; MECHANISMS ; COLORADO ; HAZARDS ; RUNOFF
Language英语
WOS SubjectEnvironmental Sciences ; Geosciences, Multidisciplinary ; Water Resources
WOS IDWOS:000314768900014
Funding OrganizationNational Key Fundamental Research Program of China (973)(2011CB409902) ; National Natural Science Foundation of China(41130753)
Citation statistics
Cited Times:22[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/5453
Collection山地灾害与地表过程重点实验室
Affiliation1.Changan Univ, Key Lab Western China Mineral Resources & Geol En, Sch Geol Engn & Surveying, Xian, Peoples R China
2.Chinese Acad Sci, Key Lab Mt Hazards & Earth Surface Proc, Inst Mt Hazards & Environm, Chengdu, Peoples R China
3.COMSATS Inst Informat Technol, Dept Earth Sci, Abbottabad, Pakistan
Recommended Citation
GB/T 7714
Zhuang, Jian-qi,Cui, Peng,Peng, Jian-bing,et al. Initiation process of debris flows on different slopes due to surface flow and trigger-specific strategies for mitigating post-earthquake in old Beichuan County, China[J]. ENVIRONMENTAL EARTH SCIENCES,2013,68(5):1391-1403.
APA Zhuang, Jian-qi,Cui, Peng,Peng, Jian-bing,Hu, Kai-heng,&Iqbal, Javed.(2013).Initiation process of debris flows on different slopes due to surface flow and trigger-specific strategies for mitigating post-earthquake in old Beichuan County, China.ENVIRONMENTAL EARTH SCIENCES,68(5),1391-1403.
MLA Zhuang, Jian-qi,et al."Initiation process of debris flows on different slopes due to surface flow and trigger-specific strategies for mitigating post-earthquake in old Beichuan County, China".ENVIRONMENTAL EARTH SCIENCES 68.5(2013):1391-1403.
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