Assessment of local outburst flood risk from successive landslides: Case study of Baige landslide-dammed lake, upper Jinsha river, eastern Tibet
文献类型：期刊论文
| 作者 | Liu, Dingzhu1,3; Cui, Yifei2; Wang, Hao4; Jin, Wen1,3; Wu, Chunhao1,3; Bazai, Nazir Ahmed1,3; Zhang, Guotao1,3; Carling, Paul A.5; Chen, Huayong1 |
| 刊名 | JOURNAL OF HYDROLOGY
 |
| 出版日期 | 2021-08-01 |
| 卷号 | 599页码:21 |
| 关键词 | Successive landslides Successive outburst floods Multi-hazard chain Effective dam height Narrowing effect |
| ISSN号 | 0022-1694 |
| DOI | 10.1016/j.jhydrol.2021.126294 |
| 通讯作者 | Cui, Yifei(yifeicui@mail.tsinghua.edu.cn) |
| 英文摘要 | Two large landslides in October and November 2018 sequentially dammed the Jinsha river at Baige village, eastern Tibet, China. Subsequently, breaching of each dam induced massive outburst floods that posed a severe threat to downstream cities and infrastructure. Field investigation indicates volumes of the first and second landslide dam are about 24.5 x 10(6) m(3) and 8.53 x 10(6) m(3), respectively. However, the peak discharge of the flood generated from the second landslide (3.1 x 10(4) m(3)/s) was significantly larger than that from the first (1.0 x 10(4) m(3)/s). The second peak discharge would have been 5.15 x 10(4) m(3)/s if the dam breached naturally. In this study, we developed two geometry parameters: effective dam height He (elevation difference between over-topping level and river bottom) and a narrowing number distribution Nr(H) (measures the degree to which a river section is occupied by landslide materials to elevation H) which represents river section narrowing effects of successive landslides. Using numerical simulations, we show that He dominates peak discharge, and it has a linear relationship with peak discharge with slope of 1009.4 m(2)/s. Furthermore, the dam includes two sub-areas: a higher part (SB-1) and a lower part (SB-2). Two floods only eroded SB-2. However, breaching of SB-1 and breached SB-2 still narrowed the river. The narrowing effects of the first and second breached dam on the river channel are around 0.35 and 0.5, respectively. Spillway and landslide runup deposits increased the local flood risk by narrowing and lifting the local river section; the first landslide promoted the second landslide, which occupied the same area and forms a dam with high He value. Consequently, a more catastrophic flood could be triggered by a small subsequent landslide. Spatial superposition phenomenon of successive landslides increased the local flood risk. This research quantitatively analyzed the influence of the geometry of dam induced by successive landslides on the process of outburst floods and the risk. |
| WOS关键词 | STABILITY ANALYSIS ; EROSION ; DAMS ; MEGAFLOOD ; PLATEAU ; FAILURE ; GLACIER ; BREACH ; METHODOLOGY ; ERODIBILITY |
| 资助项目 | National Natural Science Foundation of China[41771045] ; National Natural Science Foundation of China[41941019] ; National Natural Science Foundation of China[42077238] ; Research Fund Program of the State Key Laboratory of Hydroscience and Engineering[2020-KY-04] |
| WOS研究方向 | Engineering ; Geology ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:000673486000014 |
| 出版者 | ELSEVIER |
| 资助机构 | National Natural Science Foundation of China ; Research Fund Program of the State Key Laboratory of Hydroscience and Engineering |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/164789]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Cui, Yifei |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Mt Hazards & Earth Surface Proc, Inst Mt Hazards & Environm, Chengdu, Peoples R China 2.Tsinghua Univ, State Key Lab Hydrosci & Engn, Beijing 100084, Peoples R China 3.Univ Chinese Acad Sci, Beijing, Peoples R China 4.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Land Surface Pattern & Simulat, Beijing 100101, Peoples R China 5.Univ Southampton, Geog & Environm, Southampton, Hants, England |
| 推荐引用方式 GB/T 7714 | Liu, Dingzhu,Cui, Yifei,Wang, Hao,et al. Assessment of local outburst flood risk from successive landslides: Case study of Baige landslide-dammed lake, upper Jinsha river, eastern Tibet[J]. JOURNAL OF HYDROLOGY,2021,599:21. |
| APA | Liu, Dingzhu.,Cui, Yifei.,Wang, Hao.,Jin, Wen.,Wu, Chunhao.,...&Chen, Huayong.(2021).Assessment of local outburst flood risk from successive landslides: Case study of Baige landslide-dammed lake, upper Jinsha river, eastern Tibet.JOURNAL OF HYDROLOGY,599,21. |
| MLA | Liu, Dingzhu,et al."Assessment of local outburst flood risk from successive landslides: Case study of Baige landslide-dammed lake, upper Jinsha river, eastern Tibet".JOURNAL OF HYDROLOGY 599(2021):21. |
入库方式： OAI收割
来源：地理科学与资源研究所
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