Mitigation planning based on the prediction of river blocking by a typical large-scale debris flow in the Wenchuan earthquake area

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

	Mitigation planning based on the prediction of river blocking by a typical large-scale debris flow in the Wenchuan earthquake area
	Liu, Jinfeng1 ; You, Yong1 ; Chen, Xiaoqing; Chen, Xingzhang
刊名	LANDSLIDES
	2016-10-01
卷号	13 期号:5 页码:1231-1242
关键词	Debris flow Disaster characteristics Wenchuan earthquake River-blocking prediction Mitigation planning
ISSN号	1612-510X
通讯作者	Liu Jinfeng
英文摘要	Due to scale amplification resulting from the blocking-bursting process associated with landslide dams in debris flow catchments, many of large-scale debris flows that occurred as a result of the Wenchuan earthquake blocked the main rivers and resulted in catastrophic dam-breaking floods. To decrease the damage caused by dam-breaking floods, mitigation works should be applied in debris flow gullies. Currently, few studies focus on how to determine the key parameters concerning the scale of debris flows (i.e., peak discharge and total volume) that need to be controlled for mitigation planning considering downstream objects affected by the flow. The Xiaojia debris flow is described and analyzed as a typical large-scale case from the Yingxiu area. A back-calculation method and numerical simulation were proposed for mitigation planning in Xiaojia gully based on predictions of river blocking. First, the maximum peak flood discharge that did not endanger the town of Yingxiu was calculated. Then, the permissible blockage from a debris flow was determined based on the back-calculation of a dam-breaking flood. Finally, the scale of the largest permissible debris flow was obtained for use in mitigation plans based on numerical simulations. The calculations showed that the peak discharge of a flood that would not endanger Yingxiu should be < 1496.48 m(3)/s. Accordingly, based on the 1/3 and 1/2 breach modes, the permissible blocking height of a debris flow barrier dam should not exceed 43.09 and 31.64 m, respectively. The total volume and peak discharge of a single debris flow event should be controlled to not exceed 70.59 x 10(4) m(3) and 784.59 m(3)/s for the 1/3 breach mode and 45.21 x 10(4) m(3) and 551.77 m(3)/s for the 1/2 breach mode. Based on these determinations of the key debris flow parameters, the simulation results indicate that debris flow damage can be decreased to an acceptable level to ensure the safety of Yingxiu downstream by the implementation of two check dams in the downstream channel and a deposition works on the debris fan.
WOS标题词	Science & Technology ; Technology ; Physical Sciences
类目[WOS]	Engineering, Geological ; Geosciences, Multidisciplinary
研究领域[WOS]	Engineering ; Geology
关键词[WOS]	SICHUAN PROVINCE ; CHINA ; LANDSLIDES
收录类别	SCI
语种	英语
WOS记录号	WOS:000385174600027
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/17942]
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.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Hazards & Earth Surface Proc, Chengdu 610041, Peoples R China 2.Southwest Univ Sci & Technol, Sch Environm & Resources, Mianyang 621010, Peoples R China
推荐引用方式 GB/T 7714	Liu, Jinfeng,You, Yong,Chen, Xiaoqing,et al. Mitigation planning based on the prediction of river blocking by a typical large-scale debris flow in the Wenchuan earthquake area[J]. LANDSLIDES,2016,13(5):1231-1242.
APA	Liu, Jinfeng,You, Yong,Chen, Xiaoqing,&Chen, Xingzhang.(2016).Mitigation planning based on the prediction of river blocking by a typical large-scale debris flow in the Wenchuan earthquake area.LANDSLIDES,13(5),1231-1242.
MLA	Liu, Jinfeng,et al."Mitigation planning based on the prediction of river blocking by a typical large-scale debris flow in the Wenchuan earthquake area".LANDSLIDES 13.5(2016):1231-1242.