Landslide-dammed lake at Tangjiashan, Sichuan province, China (triggered by the Wenchuan Earthquake, May 12, 2008): risk assessment, mitigation strategy, and lessons learned

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地灾害与地表过程重点实验室

	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, Chao 1,2; Zhuang, Jian-qi 1,2; You, Yong1,2 ; Chen, Xiao-qing1,2 ; Scott, Kevin M.3
刊名	ENVIRONMENTAL EARTH SCIENCES
	2012-02-01
卷号	65 期号:4 页码:1055-1065
关键词	Wenchuan Earthquake Landslide-dammed lake Flood outburst Risk assessment Disaster mitigation Tangjiashan
ISSN号	1866-6280
通讯作者	Cui, Peng
英文摘要	Landslides 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.
WOS标题词	Science & Technology ; Life Sciences & Biomedicine ; Physical Sciences
类目[WOS]	Environmental Sciences ; Geosciences, Multidisciplinary ; Water Resources
研究领域[WOS]	Environmental Sciences & Ecology ; Geology ; Water Resources
关键词[WOS]	DAMS
收录类别	SCI
语种	英语
WOS记录号	WOS:000299840100012
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/9930]
专题	成都山地灾害与环境研究所_山地灾害与地表过程重点实验室
作者单位	1.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
推荐引用方式 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.