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A depth-averaged two-phase model for debris flows over fixed beds

Ji Li Orcid Logo, Zhixian Cao, Kaiheng Hu, Gareth Pender, Qingquan Liu

International Journal of Sediment Research, Volume: 33, Issue: 4, Pages: 462 - 477

Swansea University Author: Ji Li Orcid Logo

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Abstract

A depth-averaged two-phase model is proposed for debris flows over fixed beds, explicitly incorporating interphase and particle-particle interactions, fluid and solid fluctuations and multi grain sizes. A first-order model based on the kinetic theory of granular flows is employed to determine the st...

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Published in: International Journal of Sediment Research
ISSN: 1001-6279
Published: Elsevier BV 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa51814
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first_indexed 2019-09-12T14:49:05Z
last_indexed 2020-06-26T19:03:17Z
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spelling 2020-06-26T15:58:19.3848857 v2 51814 2019-09-12 A depth-averaged two-phase model for debris flows over fixed beds 4123c4ddbcd6e77f580974c661461c7c 0000-0003-4328-3197 Ji Li Ji Li true false 2019-09-12 CIVL A depth-averaged two-phase model is proposed for debris flows over fixed beds, explicitly incorporating interphase and particle-particle interactions, fluid and solid fluctuations and multi grain sizes. A first-order model based on the kinetic theory of granular flows is employed to determine the stresses due to solid fluctuations, while the turbulent kinetic energy - dissipation rate model is used to determine the stresses from fluid fluctuations. A well-balanced numerical algorithm is applied to solve the governing equations. The present model is benchmarked against USGS experimental debris flows over fixed beds. Incorporating the stresses due to fluid and solid fluctuations and properly estimating the bed shear stresses are shown to be crucial for reproducing the debris flows. Longitudinal particle segregation is resolved, demonstrating coarser sediments around the fronts and finer grains trailing the head. Based on extended modeling exercises, debris flow efficiency is shown to increase with initial volume, which is underpinned by observed datasets. Journal Article International Journal of Sediment Research 33 4 462 477 Elsevier BV 1001-6279 debris flow, two-phase model, depth-averaged model, fluctuation kinetic energy, multi grain sizes 31 12 2018 2018-12-31 10.1016/j.ijsrc.2017.06.003 COLLEGE NANME Civil Engineering COLLEGE CODE CIVL Swansea University 2020-06-26T15:58:19.3848857 2019-09-12T09:51:04.1483230 Ji Li 0000-0003-4328-3197 1 Zhixian Cao 2 Kaiheng Hu 3 Gareth Pender 4 Qingquan Liu 5
title A depth-averaged two-phase model for debris flows over fixed beds
spellingShingle A depth-averaged two-phase model for debris flows over fixed beds
Ji Li
title_short A depth-averaged two-phase model for debris flows over fixed beds
title_full A depth-averaged two-phase model for debris flows over fixed beds
title_fullStr A depth-averaged two-phase model for debris flows over fixed beds
title_full_unstemmed A depth-averaged two-phase model for debris flows over fixed beds
title_sort A depth-averaged two-phase model for debris flows over fixed beds
author_id_str_mv 4123c4ddbcd6e77f580974c661461c7c
author_id_fullname_str_mv 4123c4ddbcd6e77f580974c661461c7c_***_Ji Li
author Ji Li
author2 Ji Li
Zhixian Cao
Kaiheng Hu
Gareth Pender
Qingquan Liu
format Journal article
container_title International Journal of Sediment Research
container_volume 33
container_issue 4
container_start_page 462
publishDate 2018
institution Swansea University
issn 1001-6279
doi_str_mv 10.1016/j.ijsrc.2017.06.003
publisher Elsevier BV
document_store_str 0
active_str 0
description A depth-averaged two-phase model is proposed for debris flows over fixed beds, explicitly incorporating interphase and particle-particle interactions, fluid and solid fluctuations and multi grain sizes. A first-order model based on the kinetic theory of granular flows is employed to determine the stresses due to solid fluctuations, while the turbulent kinetic energy - dissipation rate model is used to determine the stresses from fluid fluctuations. A well-balanced numerical algorithm is applied to solve the governing equations. The present model is benchmarked against USGS experimental debris flows over fixed beds. Incorporating the stresses due to fluid and solid fluctuations and properly estimating the bed shear stresses are shown to be crucial for reproducing the debris flows. Longitudinal particle segregation is resolved, demonstrating coarser sediments around the fronts and finer grains trailing the head. Based on extended modeling exercises, debris flow efficiency is shown to increase with initial volume, which is underpinned by observed datasets.
published_date 2018-12-31T04:03:50Z
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score 10.993443