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Landslide-dammed lake at Tangjiashan, Sichuan province, China (triggered by the Wenchuan Earthquake, May 12, 2008): risk assessment, mitigation strategy, and lessons learned
Cui, Peng1,2; Dang, Chao1,2; Zhuang, Jian-qi1,2; You, Yong1,2; Chen, Xiao-qing1,2; Scott, Kevin M.3
Corresponding AuthorCui, Peng
2012
Source PublicationENVIRONMENTAL EARTH SCIENCES
ISSN1866-6280
Volume65Issue:4Pages:1055-1065
SubtypeArticle
AbstractLandslides and rock avalanches triggered by the 2008 Wenchuan Earthquake produced 257 landslide dams, mainly situated along the eastern boundary of the Qinghai-Tibet Plateau where rivers descend approximately 3,000 m into the Sichuan Basin. The largest of these dams blocked the Tongkou River (a tributary of the Fujiang River) at Tangjiashan. The blockage, consisting of 2.04 x 10(7) m(3) of landslide debris, impounded a lake with a projected maximum volume of 3.15 x 10(8) m(3), potentially inundating 8.92 km(2) of terrain. Its creation during the rainy season and the possibility of an uncontrolled release posed a serious, impending threat to at least 1.3 million people downstream that could add substantially to the total of 69,200 individuals directly killed by the earthquake. Risk assessment of the blockage indicated that it was unlikely to collapse suddenly, and that eventual overtopping could be mitigated by notching the structure in order to create an engineered breach and achieve safe drainage of the lake. In addition to the installation of monitoring and warning instrumentation, for emergency planning we estimated several outburst scenarios equivalent to 20, 25, 33, and 50% of the dam failing suddenly, creating, respectively, 3.35, 3.84, 4.22, and 4.65 km(2) of flooded area, and overbank water depths of 4.6, 5.1, 5.7, and 6.2 m, respectively, in Mianyang, the second largest city in Sichuan Province, 48 km downstream from the blockage. Based on these scenarios, recommendations and plans for excavating a sluiceway, draining the lake, and downstream evacuation were proposed and later were implemented successfully, with the blockage breached by overtopping on June 10, less than a month after dam emplacement. The peak discharge of the release only slightly exceeded the flood of record at Mianyang City. No lives were lost, and significant property damage was avoided. Post-breaching evaluation reveals how future similar mitigation can be improved. Although initial breach erosion was slow, later erosion was judged uncontrollably rapid; increased slope of the engineered channel and adoption of a compound, trapezoid-triangular cross-section can be considered, as can other measures to control the rate of breach incision. Evacuees from Mianyang City spent an unnecessarily long time (12 days) in temporary settlements; more precise risk management planning can reduce this time in the future.
KeywordWenchuan Earthquake Landslide-dammed Lake Flood Outburst Risk Assessment Disaster Mitigation Tangjiashan
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine ; Physical Sciences
DOI10.1007/s12665-010-0749-2
WOS Subject ExtendedEnvironmental Sciences & Ecology ; Geology ; Water Resources
Indexed BySCI
WOS KeywordDAMS
Language英语
Quartile4区
TOP
WOS SubjectEnvironmental Sciences ; Geosciences, Multidisciplinary ; Water Resources
WOS IDWOS:000299840100012
Funding OrganizationState Key Fundamental Research Program(2008CB425802) ; Chinese Academy of Sciences(KZCX2-YW-302)
Citation statistics
Cited Times:36[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/9930
Collection山地灾害与地表过程重点实验室
Affiliation1.CAS, Key Lab Mt Hazards & Earth Surface Proc, Chengdu, Peoples R China
2.CAS, Inst Mt Hazards & Environm, Chengdu, Peoples R China
3.US Geol Survey, US Dept Interior, Vancouver, WA USA
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Cui, Peng,Dang, Chao,Zhuang, Jian-qi,et al. Landslide-dammed lake at Tangjiashan, Sichuan province, China (triggered by the Wenchuan Earthquake, May 12, 2008): risk assessment, mitigation strategy, and lessons learned[J]. ENVIRONMENTAL EARTH SCIENCES,2012,65(4):1055-1065.
APA Cui, Peng,Dang, Chao,Zhuang, Jian-qi,You, Yong,Chen, Xiao-qing,&Scott, Kevin M..(2012).Landslide-dammed lake at Tangjiashan, Sichuan province, China (triggered by the Wenchuan Earthquake, May 12, 2008): risk assessment, mitigation strategy, and lessons learned.ENVIRONMENTAL EARTH SCIENCES,65(4),1055-1065.
MLA Cui, Peng,et al."Landslide-dammed lake at Tangjiashan, Sichuan province, China (triggered by the Wenchuan Earthquake, May 12, 2008): risk assessment, mitigation strategy, and lessons learned".ENVIRONMENTAL EARTH SCIENCES 65.4(2012):1055-1065.
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