Geomorphic effects of recurrent outburst superfloods in the Yigong River on the southeastern margin of Tibet

Abstract 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 > 105 m3/s in 1902 and 2000 AD. One of the slackwater deposits, which was newly fou...

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Autores principales:	Kaiheng Hu, Chaohua Wu, Li Wei, Xiaopeng Zhang, Qiyuan Zhang, Weiming Liu, Brian J. Yanites
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/170e3f7d61e74127b7a653b9abafa666
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spelling	oai:doaj.org-article:170e3f7d61e74127b7a653b9abafa6662021-12-02T17:06:32ZGeomorphic effects of recurrent outburst superfloods in the Yigong River on the southeastern margin of Tibet10.1038/s41598-021-95194-12045-2322https://doaj.org/article/170e3f7d61e74127b7a653b9abafa6662021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-95194-1https://doaj.org/toc/2045-2322Abstract 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 > 105 m3/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 m3/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 m3 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.Kaiheng HuChaohua WuLi WeiXiaopeng ZhangQiyuan ZhangWeiming LiuBrian J. YanitesNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Kaiheng Hu Chaohua Wu Li Wei Xiaopeng Zhang Qiyuan Zhang Weiming Liu Brian J. Yanites Geomorphic effects of recurrent outburst superfloods in the Yigong River on the southeastern margin of Tibet
description	Abstract 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 > 105 m3/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 m3/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 m3 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.
format	article
author	Kaiheng Hu Chaohua Wu Li Wei Xiaopeng Zhang Qiyuan Zhang Weiming Liu Brian J. Yanites
author_facet	Kaiheng Hu Chaohua Wu Li Wei Xiaopeng Zhang Qiyuan Zhang Weiming Liu Brian J. Yanites
author_sort	Kaiheng Hu
title	Geomorphic effects of recurrent outburst superfloods in the Yigong River on the southeastern margin of Tibet
title_short	Geomorphic effects of recurrent outburst superfloods in the Yigong River on the southeastern margin of Tibet
title_full	Geomorphic effects of recurrent outburst superfloods in the Yigong River on the southeastern margin of Tibet
title_fullStr	Geomorphic effects of recurrent outburst superfloods in the Yigong River on the southeastern margin of Tibet
title_full_unstemmed	Geomorphic effects of recurrent outburst superfloods in the Yigong River on the southeastern margin of Tibet
title_sort	geomorphic effects of recurrent outburst superfloods in the yigong river on the southeastern margin of tibet
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/170e3f7d61e74127b7a653b9abafa666
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Geomorphic effects of recurrent outburst superfloods in the Yigong River on the southeastern margin of Tibet

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