Channel aggradation triggered by dam failure amplifies the damage of outburst flood
文献类型：期刊论文
| 作者 | Liu, Dingzhu4; Cui, Yifei3; Jin, Wen2; Wang, Hao; Tang, Hui4 |
| 刊名 | LANDSLIDES
 |
| 出版日期 | 2023-04-01 |
| 卷号 | N/A |
| 关键词 | Debris flow dam Outburst flood simulation Channel aggradation Outburst flood risk |
| ISSN号 | 1612-5118 |
| DOI | 10.1007/s10346-023-02026-6 |
| 文献子类 | Article; Early Access |
| 英文摘要 | Outburst floods generated by dam breaches associated with debris flow may have long-lasting effects on the formation and development landscape and the safety of human beings, increasing the difficulty of disaster prevention and mitigation. However, little was considered about channel aggradation contributing downstream damage of outburst flood. Therefore, we investigated a debris flow dam's breaching and flooding process triggered by a 50-year heavy rainfall occurring on 17th June 2020 in Danba, China. The 6-m dam and a concomitant 1.04 x 10(6) m(3) barrier lake were formed by a tributary debris flow blocking the Xiaojin river. We used the dam breach overtopping and two-dimensional hydrodynamic models to simulate the whole process. The dam breach event persisted for 4.5 h with an outburst flood peak discharge of 823.5 m(3)/s, equal to a 20-year flood. It was noted that numerous sediments of approximately 5 x 10(6) m(3) were transported to the downstream channel, elevating the main channel bed and the terrace by 10-15 m and 2-5 m, respectively. Averaged transportation efficiency of an outburst flood is 1269.73 times greater than a 20-year seasonal flood. We simulated representative seasonal floods and outburst floods based on the pre-beach river geometry, which shows that previous channel capacity is sufficient to convey seasonal floods and the outburst flood. However, the outburst flood could easily submerge terraces and living land using after-breach geometry. Due to river aggradation lifting river elevation, deposited riverbed promotes sediment and flood evolute to living land, resulting in amplified damage. Additionally, we collected 59 dam breaches and demonstrated that local riverbed slopes could increase more than 100 times. During dam breaches, the sharp slope plays a key role in high sediment transportation efficiency. This study can promote understanding the formation and development of channel aggradation triggered by outburst flood and provide more reasonable considerations for disaster prevention and mitigation triggered by outburst flood hazard chain. |
| WOS关键词 | JINSHA RIVER ; LAKE ; MEGAFLOOD ; EROSION ; BREACH ; RISK ; LANDSLIDES ; SIMULATION ; CHINA ; TIBET |
| WOS研究方向 | Engineering ; Geology |
| WOS记录号 | WOS:000946854700001 |
| 出版者 | SPRINGER HEIDELBERG |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/190243]  |
| 专题 | 陆地表层格局与模拟院重点实验室_外文论文 |
| 作者单位 | 1.Natl Disaster Reduct Ctr China, Minist Emergency Management, Beijing 100124, Peoples R China 2.Tsinghua Univ, State Key Lab Hydrosci & Engn, Beijing 100084, Peoples R China 3.German Res Ctr Geosci GFZ, Earth Surface Proc Modelling, Sect 4-7, D-14473 Potsdam, Germany 4.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Land Surface Pattern & Simulat, Beijing 100101, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Dingzhu,Cui, Yifei,Jin, Wen,et al. Channel aggradation triggered by dam failure amplifies the damage of outburst flood[J]. LANDSLIDES,2023,N/A. |
| APA | Liu, Dingzhu,Cui, Yifei,Jin, Wen,Wang, Hao,&Tang, Hui.(2023).Channel aggradation triggered by dam failure amplifies the damage of outburst flood.LANDSLIDES,N/A. |
| MLA | Liu, Dingzhu,et al."Channel aggradation triggered by dam failure amplifies the damage of outburst flood".LANDSLIDES N/A(2023). |
入库方式： OAI收割
来源：地理科学与资源研究所
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