Geomorphic effects of recurrent outburst superfloods in the Yigong River on the southeastern margin of Tibet.
| Autor: | Hu K; Key Laboratory of Mountain Hazards and Earth Surface Processes, Chinese Academy of Sciences, Chengdu, 610041, China. khhu@imde.ac.cn.; Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, 610041, China. khhu@imde.ac.cn., Wu C; Key Laboratory of Mountain Hazards and Earth Surface Processes, Chinese Academy of Sciences, Chengdu, 610041, China.; Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, 610041, China., Wei L; Key Laboratory of Mountain Hazards and Earth Surface Processes, Chinese Academy of Sciences, Chengdu, 610041, China.; Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, 610041, China., Zhang X; Key Laboratory of Mountain Hazards and Earth Surface Processes, Chinese Academy of Sciences, Chengdu, 610041, China.; Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, 610041, China., Zhang Q; Key Laboratory of Mountain Hazards and Earth Surface Processes, Chinese Academy of Sciences, Chengdu, 610041, China.; Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, 610041, China., Liu W; Key Laboratory of Mountain Hazards and Earth Surface Processes, Chinese Academy of Sciences, Chengdu, 610041, China.; Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, 610041, China., Yanites BJ; Department of Earth and Atmospheric Sciences, Indiana University Bloomington, Bloomington, IN, 47405, USA. |
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| Jazyk: | angličtina |
| Zdroj: | Scientific reports [Sci Rep] 2021 Aug 02; Vol. 11 (1), pp. 15577. Date of Electronic Publication: 2021 Aug 02. |
| DOI: | 10.1038/s41598-021-95194-1 |
| Abstrakt: | Landslide dam outburst floods have a significant impact on landform evolution in high mountainous areas. Historic landslide dams on the Yigong River, southeastern Tibet, generated two outburst superfloods > 10 5 m 3 /s in 1902 and 2000 AD. One of the slackwater deposits, which was newly found immediately downstream of the historic dams, has been dated to 7 ka BP. The one-dimensional backwater stepwise method gives an estimate of 225,000 m 3 /s for the peak flow related to the paleo-stage indicator of 7 ka BP. The recurrence of at least three large landslide dam impoundments and super-outburst floods at the exit of Yigong Lake during the Holocene greatly changed the morphology of the Yigong River. More than 0.26 billion m 3 of sediment has been aggraded in the dammed lake while the landslide sediment doubles the channel slope behind the dam. Repeated landslide damming may be a persistent source of outburst floods and impede the upstream migration of river knickpoints in the southeastern margin of Tibet. (© 2021. The Author(s).) |
| Databáze: | MEDLINE |
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