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Hydro-sediment-morphodynamic processes of the baige landslide-induced barrier Lake, Jinsha River, China / Ji Li, Zhixian Cao, Yifei Cui, Xuanmei Fan, Wenjun Yang, Wei Huang, Alistair Borthwick

Journal of Hydrology, Volume: 596, Start page: 126134

Swansea University Author: Ji Li

  • Accepted Manuscript under embargo until: 26th February 2022

Abstract

A large landslide impacting a river may cause a multi-phase chain of hazards, comprising landslide-generated waves, inundation as a barrier lake develops upstream a landslide dam arising from rapid sediment deposition, and downstream flooding due to barrier lake outburst. Two major landslides (each...

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Published in: Journal of Hydrology
ISSN: 0022-1694
Published: Elsevier BV 2021
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URI: https://cronfa.swan.ac.uk/Record/cronfa56347
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Two major landslides (each of volume &#x223C; 107 m3) occurred successively on 10th October and 3rd November 2018 at Baige village, Tibet, China. Both landslides led to a natural dam that completely blocked the Jinsha River, along with a barrier lake filled with upstream river inflow. Although the first barrier lake breached naturally, a significant quantity of residual material from the first landslide dam was left behind without being eroded. After the second landslide occurred, a flood channel was urgently constructed to facilitate an artificial breach of the barrier lake as it formed. The Baige landslide-induced barrier lake is unique as triggered by two successive landslides and outbursts a mere five weeks apart. Here a computational investigation is presented of the hydro-sediment-morphodynamic processes of the Baige barrier lake, using a recent 2D double layer-averaged two-phase flow model. This is the first modelling study of the whole field and whole processes for the formation and outburst of a landslide-induced barrier lake as well as the resultant floods, without evoking presumptions on dam breach (which have prevailed for decades and bear much uncertainty). The computed results agree well with field observations in terms of landslide-generated waves, landslide dam morphology, stage and discharge hydrographs at the dam site and downstream flood hydrographs. The artificial flood channel is shown to be effective for alleviating downstream inundation. Water and grain velocities are demonstrated to be distinct, characterizing the primary role of grains in landslide dam and barrier lake formation and the dominant role of water in barrier lake outburst and the resultant flood. Relatively low inflow discharge and large initial landslide volume favour landslide dam and barrier lake formation, but delay the outburst and downstream flood. 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spelling 2021-06-08T10:31:20.9932887 v2 56347 2021-02-28 Hydro-sediment-morphodynamic processes of the baige landslide-induced barrier Lake, Jinsha River, China 4123c4ddbcd6e77f580974c661461c7c 0000-0003-4328-3197 Ji Li Ji Li true false 2021-02-28 CIVL A large landslide impacting a river may cause a multi-phase chain of hazards, comprising landslide-generated waves, inundation as a barrier lake develops upstream a landslide dam arising from rapid sediment deposition, and downstream flooding due to barrier lake outburst. Two major landslides (each of volume ∼ 107 m3) occurred successively on 10th October and 3rd November 2018 at Baige village, Tibet, China. Both landslides led to a natural dam that completely blocked the Jinsha River, along with a barrier lake filled with upstream river inflow. Although the first barrier lake breached naturally, a significant quantity of residual material from the first landslide dam was left behind without being eroded. After the second landslide occurred, a flood channel was urgently constructed to facilitate an artificial breach of the barrier lake as it formed. The Baige landslide-induced barrier lake is unique as triggered by two successive landslides and outbursts a mere five weeks apart. Here a computational investigation is presented of the hydro-sediment-morphodynamic processes of the Baige barrier lake, using a recent 2D double layer-averaged two-phase flow model. This is the first modelling study of the whole field and whole processes for the formation and outburst of a landslide-induced barrier lake as well as the resultant floods, without evoking presumptions on dam breach (which have prevailed for decades and bear much uncertainty). The computed results agree well with field observations in terms of landslide-generated waves, landslide dam morphology, stage and discharge hydrographs at the dam site and downstream flood hydrographs. The artificial flood channel is shown to be effective for alleviating downstream inundation. Water and grain velocities are demonstrated to be distinct, characterizing the primary role of grains in landslide dam and barrier lake formation and the dominant role of water in barrier lake outburst and the resultant flood. Relatively low inflow discharge and large initial landslide volume favour landslide dam and barrier lake formation, but delay the outburst and downstream flood. The present 2D double layer-averaged two-phase model holds great promise for assessing future landslide-induced multi-hazard chains in rivers, and informing mitigation and adaptation strategies. Journal Article Journal of Hydrology 596 126134 Elsevier BV 0022-1694 landslide dam, landslide-generated waves, barrier lake outburst, flood, hydro-sediment-morphodynamic processes, double layer-averaged two-phase flow model 1 5 2021 2021-05-01 10.1016/j.jhydrol.2021.126134 COLLEGE NANME Civil Engineering COLLEGE CODE CIVL Swansea University 2021-06-08T10:31:20.9932887 2021-02-28T13:32:30.7835823 College of Engineering Engineering Ji Li 0000-0003-4328-3197 1 Zhixian Cao 2 Yifei Cui 3 Xuanmei Fan 4 Wenjun Yang 5 Wei Huang 6 Alistair Borthwick 7 Under embargo Under embargo 2021-03-04T11:45:01.4459826 Output 14479430 application/pdf Accepted Manuscript true 2022-02-26T00:00:00.0000000 ©2021 All rights reserved. All article content, except where otherwise noted, is licensed under a Creative Commons Attribution Non-Commercial No Derivatives License (CC-BY-NC-ND) true eng
title Hydro-sediment-morphodynamic processes of the baige landslide-induced barrier Lake, Jinsha River, China
spellingShingle Hydro-sediment-morphodynamic processes of the baige landslide-induced barrier Lake, Jinsha River, China
Ji, Li
title_short Hydro-sediment-morphodynamic processes of the baige landslide-induced barrier Lake, Jinsha River, China
title_full Hydro-sediment-morphodynamic processes of the baige landslide-induced barrier Lake, Jinsha River, China
title_fullStr Hydro-sediment-morphodynamic processes of the baige landslide-induced barrier Lake, Jinsha River, China
title_full_unstemmed Hydro-sediment-morphodynamic processes of the baige landslide-induced barrier Lake, Jinsha River, China
title_sort Hydro-sediment-morphodynamic processes of the baige landslide-induced barrier Lake, Jinsha River, China
author_id_str_mv 4123c4ddbcd6e77f580974c661461c7c
author_id_fullname_str_mv 4123c4ddbcd6e77f580974c661461c7c_***_Ji, Li
author Ji, Li
author2 Ji Li
Zhixian Cao
Yifei Cui
Xuanmei Fan
Wenjun Yang
Wei Huang
Alistair Borthwick
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college_str College of Engineering
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hierarchy_top_title College of Engineering
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department_str Engineering{{{_:::_}}}College of Engineering{{{_:::_}}}Engineering
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description A large landslide impacting a river may cause a multi-phase chain of hazards, comprising landslide-generated waves, inundation as a barrier lake develops upstream a landslide dam arising from rapid sediment deposition, and downstream flooding due to barrier lake outburst. Two major landslides (each of volume ∼ 107 m3) occurred successively on 10th October and 3rd November 2018 at Baige village, Tibet, China. Both landslides led to a natural dam that completely blocked the Jinsha River, along with a barrier lake filled with upstream river inflow. Although the first barrier lake breached naturally, a significant quantity of residual material from the first landslide dam was left behind without being eroded. After the second landslide occurred, a flood channel was urgently constructed to facilitate an artificial breach of the barrier lake as it formed. The Baige landslide-induced barrier lake is unique as triggered by two successive landslides and outbursts a mere five weeks apart. Here a computational investigation is presented of the hydro-sediment-morphodynamic processes of the Baige barrier lake, using a recent 2D double layer-averaged two-phase flow model. This is the first modelling study of the whole field and whole processes for the formation and outburst of a landslide-induced barrier lake as well as the resultant floods, without evoking presumptions on dam breach (which have prevailed for decades and bear much uncertainty). The computed results agree well with field observations in terms of landslide-generated waves, landslide dam morphology, stage and discharge hydrographs at the dam site and downstream flood hydrographs. The artificial flood channel is shown to be effective for alleviating downstream inundation. Water and grain velocities are demonstrated to be distinct, characterizing the primary role of grains in landslide dam and barrier lake formation and the dominant role of water in barrier lake outburst and the resultant flood. Relatively low inflow discharge and large initial landslide volume favour landslide dam and barrier lake formation, but delay the outburst and downstream flood. The present 2D double layer-averaged two-phase model holds great promise for assessing future landslide-induced multi-hazard chains in rivers, and informing mitigation and adaptation strategies.
published_date 2021-05-01T04:23:09Z
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