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Barrier lake formation due to landslide impacting a river: A numerical study using a double layer-averaged two-phase flow model

Ji Li Orcid Logo, Zhixian Cao, Yifei Cui, Alistair G.L. Borthwick

Applied Mathematical Modelling, Volume: 80, Pages: 574 - 601

Swansea University Author: Ji Li Orcid Logo

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DOI (Published version): 10.1016/j.apm.2019.11.031

Abstract

A granular landslide impacting a river may lead to the formation of a landslide dam blocking the streamflow, and subsequently create a barrier lake. Should a barrier lake outburst, the flood may be destructive and spell disastrous consequences downstream. The last decade or so has witnessed a number...

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Published in: Applied Mathematical Modelling
ISSN: 0307-904X
Published: Elsevier BV 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa53129
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spelling 2020-01-07T10:25:49.2377119 v2 53129 2020-01-07 Barrier lake formation due to landslide impacting a river: A numerical study using a double layer-averaged two-phase flow model 4123c4ddbcd6e77f580974c661461c7c 0000-0003-4328-3197 Ji Li Ji Li true false 2020-01-07 CIVL A granular landslide impacting a river may lead to the formation of a landslide dam blocking the streamflow, and subsequently create a barrier lake. Should a barrier lake outburst, the flood may be destructive and spell disastrous consequences downstream. The last decade or so has witnessed a number of experimental and numerical investigations on barrier lake outburst flooding, whilst studies on barrier lake formation remain rare – a physically enhanced and practically viable mathematical model is still missing. Generally, barrier lake formation is characterized by multi-physical, interactive processes between water flow, multi-sized sediment transport and morphological evolution. Here, a new double layer-averaged two-phase flow model is proposed, which is an advance on existing continuum models that involve a single-phase flow assumption and presume a single sediment size, and discrete models that preclude fine grains and assume narrow grain size distributions. The proposed model is first validated against data from previous laboratory experiments of waves due to landslides impacting reservoirs and landslide dam formation over dry valleys. Then it is applied to explore the complicated mechanism and threshold for barrier lake formation. The water and grain velocities are shown to be disparate, characterizing the primary role of grains in driving water movement during subaqueous landslide motion and also demonstrating the need for a two-phase flow approach. The grain size effects are revealed, i.e., coarse grains and grain-size uniformity favour barrier lake formation. A new threshold condition is proposed for barrier lake formation, integrating the landslide-to-river momentum ratio and grain size effects. The present work facilitates a promising modelling framework for solving barrier lake formation, thereby underpinning the assessment of flood hazards due to barrier lakes. Journal Article Applied Mathematical Modelling 80 574 601 Elsevier BV 0307-904X Barrier lake formation, Granular landslide, Double layer-averaged model, Two-phase flow model, Grain size effect, Threshold condition 1 4 2020 2020-04-01 10.1016/j.apm.2019.11.031 COLLEGE NANME Civil Engineering COLLEGE CODE CIVL Swansea University 2020-01-07T10:25:49.2377119 2020-01-07T10:25:49.2377119 Ji Li 0000-0003-4328-3197 1 Zhixian Cao 2 Yifei Cui 3 Alistair G.L. Borthwick 4 53129__16244__0166fa07712a49daaca17b5261f7e902.pdf li2019.pdf 2020-01-08T14:29:09.5614267 Output 4228142 application/pdf Accepted Manuscript true 2020-11-21T00:00:00.0000000 Released under the terms of a Creative Commons Attribution Non-Commercial No Derivatives License (CC-BY-NC-ND). true eng http://creativecommons.org/licenses/by-nc-nd/4.0/
title Barrier lake formation due to landslide impacting a river: A numerical study using a double layer-averaged two-phase flow model
spellingShingle Barrier lake formation due to landslide impacting a river: A numerical study using a double layer-averaged two-phase flow model
Ji Li
title_short Barrier lake formation due to landslide impacting a river: A numerical study using a double layer-averaged two-phase flow model
title_full Barrier lake formation due to landslide impacting a river: A numerical study using a double layer-averaged two-phase flow model
title_fullStr Barrier lake formation due to landslide impacting a river: A numerical study using a double layer-averaged two-phase flow model
title_full_unstemmed Barrier lake formation due to landslide impacting a river: A numerical study using a double layer-averaged two-phase flow model
title_sort Barrier lake formation due to landslide impacting a river: A numerical study using a double layer-averaged two-phase flow model
author_id_str_mv 4123c4ddbcd6e77f580974c661461c7c
author_id_fullname_str_mv 4123c4ddbcd6e77f580974c661461c7c_***_Ji Li
author Ji Li
author2 Ji Li
Zhixian Cao
Yifei Cui
Alistair G.L. Borthwick
format Journal article
container_title Applied Mathematical Modelling
container_volume 80
container_start_page 574
publishDate 2020
institution Swansea University
issn 0307-904X
doi_str_mv 10.1016/j.apm.2019.11.031
publisher Elsevier BV
document_store_str 1
active_str 0
description A granular landslide impacting a river may lead to the formation of a landslide dam blocking the streamflow, and subsequently create a barrier lake. Should a barrier lake outburst, the flood may be destructive and spell disastrous consequences downstream. The last decade or so has witnessed a number of experimental and numerical investigations on barrier lake outburst flooding, whilst studies on barrier lake formation remain rare – a physically enhanced and practically viable mathematical model is still missing. Generally, barrier lake formation is characterized by multi-physical, interactive processes between water flow, multi-sized sediment transport and morphological evolution. Here, a new double layer-averaged two-phase flow model is proposed, which is an advance on existing continuum models that involve a single-phase flow assumption and presume a single sediment size, and discrete models that preclude fine grains and assume narrow grain size distributions. The proposed model is first validated against data from previous laboratory experiments of waves due to landslides impacting reservoirs and landslide dam formation over dry valleys. Then it is applied to explore the complicated mechanism and threshold for barrier lake formation. The water and grain velocities are shown to be disparate, characterizing the primary role of grains in driving water movement during subaqueous landslide motion and also demonstrating the need for a two-phase flow approach. The grain size effects are revealed, i.e., coarse grains and grain-size uniformity favour barrier lake formation. A new threshold condition is proposed for barrier lake formation, integrating the landslide-to-river momentum ratio and grain size effects. The present work facilitates a promising modelling framework for solving barrier lake formation, thereby underpinning the assessment of flood hazards due to barrier lakes.
published_date 2020-04-01T04:05:57Z
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score 11.013507

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