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Risk assessment of simultaneous debris flows in mountain townships
Cui, Peng1; Zou, Qiang1,2,3; Xiang, Ling-zhi4; Zeng, Chao1,2
Corresponding AuthorCui, Peng
AbstractMany mountain towns in China are located on the joint alluvial fans of multiple and adjacent past debris flows, making them vulnerable to large, multiple, and simultaneous debris flows during heavy rainfall. Without emergency management planning, such flows, often appearing with interconnecting and chain-reaction processes, can lead to extensive loss of life and property. In the Wenchuan earthquake-affected area, such disasters are common. We analyzed the compound effects of simultaneous debris flow events, and proposed three quantitative methods of debris risk assessment based on kinetic energy, flow depth, and inundation depth. Validated using a field study of actual debris flow disasters, these analyses are useful in determining the type, quantity, distribution, economic worth, and susceptibility of hazard-affected objects in a region. Subsequently, we established a method to determine the vulnerability of different hazard-affected objects, particularly concerning the susceptibility indexes of buildings or structures. By analyzing the elements underlying hazard formation conditions, damage potential, and the socio-economic conditions of mountain townships, we proposed a systematic and quantitative method for risk analysis of mountain townships. Finally, the proposed method was applied to a case study of Qingping Township, which was affected by 21 simultaneous debris flows triggered by a 50-year return period precipitation event. The proposed method analyzed the superposition and chain-reaction effects of disasters and divided the affected area of the township into three risk zones. The analysis indicated that the calculated risk zones coincide with the actual distribution and severity of damage in the debris flow event, which suggests that the risk assessment is consistent with results from the actual disaster.
KeywordDebris Flow Hazard Analysis Risk Assessment Vulnerability Wenchuan Earthquake
WOS HeadingsScience & Technology ; Physical Sciences
WOS Subject ExtendedPhysical Geography ; Geology
Indexed BySCI
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary
WOS IDWOS:000322155100004
Funding OrganizationNational Basic Research Program of China (973 Program)(2011CB409902 ; National Nature Science Foundation of China(41030742) ; 2008CB425802)
Citation statistics
Cited Times:28[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Inst Mt Hazards & Environm, CAS Key Lab Mt Hazards & Earth Surface Proc, Beijing 100864, Peoples R China
2.Univ Chinese Acad Sci, Changchun, Peoples R China
3.Southwest Univ Sci & Technol, Mianyang, Peoples R China
4.Chongqing Jiaotong Univ, Chongqing, Peoples R China
Recommended Citation
GB/T 7714
Cui, Peng,Zou, Qiang,Xiang, Ling-zhi,et al. Risk assessment of simultaneous debris flows in mountain townships[J]. PROGRESS IN PHYSICAL GEOGRAPHY-EARTH AND ENVIRONMENT,2013,37(4):516-542.
APA Cui, Peng,Zou, Qiang,Xiang, Ling-zhi,&Zeng, Chao.(2013).Risk assessment of simultaneous debris flows in mountain townships.PROGRESS IN PHYSICAL GEOGRAPHY-EARTH AND ENVIRONMENT,37(4),516-542.
MLA Cui, Peng,et al."Risk assessment of simultaneous debris flows in mountain townships".PROGRESS IN PHYSICAL GEOGRAPHY-EARTH AND ENVIRONMENT 37.4(2013):516-542.
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