Journal article 512 views
A depth-averaged two-phase model for debris flows over fixed beds
International Journal of Sediment Research, Volume: 33, Issue: 4, Pages: 462 - 477
Swansea University Author:
Ji Li
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DOI (Published version): 10.1016/j.ijsrc.2017.06.003
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...
Published in: | International Journal of Sediment Research |
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ISSN: | 1001-6279 |
Published: |
Elsevier BV
2018
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URI: | https://cronfa.swan.ac.uk/Record/cronfa51814 |
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<?xml version="1.0"?><rfc1807><datestamp>2020-06-26T15:58:19.3848857</datestamp><bib-version>v2</bib-version><id>51814</id><entry>2019-09-12</entry><title>A depth-averaged two-phase model for debris flows over fixed beds</title><swanseaauthors><author><sid>4123c4ddbcd6e77f580974c661461c7c</sid><ORCID>0000-0003-4328-3197</ORCID><firstname>Ji</firstname><surname>Li</surname><name>Ji Li</name><active>true</active><ethesisStudent>false</ethesisStudent></author></swanseaauthors><date>2019-09-12</date><deptcode>CIVL</deptcode><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 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.</abstract><type>Journal Article</type><journal>International Journal of Sediment Research</journal><volume>33</volume><journalNumber>4</journalNumber><paginationStart>462</paginationStart><paginationEnd>477</paginationEnd><publisher>Elsevier BV</publisher><issnPrint>1001-6279</issnPrint><keywords>debris flow, two-phase model, depth-averaged model, fluctuation kinetic energy, multi grain sizes</keywords><publishedDay>31</publishedDay><publishedMonth>12</publishedMonth><publishedYear>2018</publishedYear><publishedDate>2018-12-31</publishedDate><doi>10.1016/j.ijsrc.2017.06.003</doi><url/><notes/><college>COLLEGE NANME</college><department>Civil Engineering</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>CIVL</DepartmentCode><institution>Swansea University</institution><apcterm/><lastEdited>2020-06-26T15:58:19.3848857</lastEdited><Created>2019-09-12T09:51:04.1483230</Created><authors><author><firstname>Ji</firstname><surname>Li</surname><orcid>0000-0003-4328-3197</orcid><order>1</order></author><author><firstname>Zhixian</firstname><surname>Cao</surname><order>2</order></author><author><firstname>Kaiheng</firstname><surname>Hu</surname><order>3</order></author><author><firstname>Gareth</firstname><surname>Pender</surname><order>4</order></author><author><firstname>Qingquan</firstname><surname>Liu</surname><order>5</order></author></authors><documents/><OutputDurs/></rfc1807> |
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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 |
_version_ |
1763753307734540288 |
score |
10.969837 |