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A depth-averaged two-phase model for fluvial sediment-laden flows over erodible beds

Ji Li Orcid Logo, Zhixian Cao, Honglu Qian, Qingquan Liu, Gareth Pender

Advances in Water Resources, Volume: 129, Pages: 338 - 353

Swansea University Author: Ji Li Orcid Logo

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DOI (Published version): 10.1016/j.advwatres.2017.08.014

Abstract

Fluvial sediment-laden flow represents a class of fluid-solid two-phase flows, which typically involve multi grain sizes, interphase and particle-particle interactions, and mass exchange with the bed. However, existing depth-averaged models ignore one or more of these physical aspects. Here a physic...

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Published in: Advances in Water Resources
ISSN: 03091708
Published: 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa51811
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first_indexed 2019-09-12T14:49:05Z
last_indexed 2019-09-23T20:18:23Z
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fullrecord <?xml version="1.0"?><rfc1807><datestamp>2019-09-23T16:30:19.3887534</datestamp><bib-version>v2</bib-version><id>51811</id><entry>2019-09-12</entry><title>A depth-averaged two-phase model for fluvial sediment-laden flows over erodible 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>Fluvial sediment-laden flow represents a class of fluid-solid two-phase flows, which typically involve multi grain sizes, interphase and particle-particle interactions, and mass exchange with the bed. However, existing depth-averaged models ignore one or more of these physical aspects. Here a physically enhanced, coupled depth-averaged two-phase model is proposed for fluvial sediment-laden flow, which explicitly incorporates all these aspects and also turbulent Reynolds stresses. A well-balanced numerical algorithm is applied to solve the governing equations of the model. The present model is benchmarked against a series of typical cases, concerning refilling of a dredged trench, bed aggradation due to sediment overloading, and flood flows due to landslide dam failure. It features encouraging performance as compared to measured data and a quasi single-phase mixture model. The present model reveals that the larger the grain size, the slower the sediment fraction transports, which concurs with prior findings from experimental observations and field data. Also, the fluid phase Reynolds stresses are considerable where the flow rapidly varies, whilst the solid phase Reynolds stresses are negligible if sediment concentration is sufficiently low.</abstract><type>Journal Article</type><journal>Advances in Water Resources</journal><volume>129</volume><paginationStart>338</paginationStart><paginationEnd>353</paginationEnd><publisher/><issnPrint>03091708</issnPrint><keywords>open channel flow, sediment-laden flow, shallow water, two-phase model, erodible bed, multi grain sizes</keywords><publishedDay>1</publishedDay><publishedMonth>7</publishedMonth><publishedYear>2019</publishedYear><publishedDate>2019-07-01</publishedDate><doi>10.1016/j.advwatres.2017.08.014</doi><url/><notes/><college>COLLEGE NANME</college><department>Civil Engineering</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>CIVL</DepartmentCode><institution>Swansea University</institution><apcterm/><lastEdited>2019-09-23T16:30:19.3887534</lastEdited><Created>2019-09-12T09:39:36.5036613</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>Honglu</firstname><surname>Qian</surname><order>3</order></author><author><firstname>Qingquan</firstname><surname>Liu</surname><order>4</order></author><author><firstname>Gareth</firstname><surname>Pender</surname><order>5</order></author></authors><documents/><OutputDurs/></rfc1807>
spelling 2019-09-23T16:30:19.3887534 v2 51811 2019-09-12 A depth-averaged two-phase model for fluvial sediment-laden flows over erodible beds 4123c4ddbcd6e77f580974c661461c7c 0000-0003-4328-3197 Ji Li Ji Li true false 2019-09-12 CIVL Fluvial sediment-laden flow represents a class of fluid-solid two-phase flows, which typically involve multi grain sizes, interphase and particle-particle interactions, and mass exchange with the bed. However, existing depth-averaged models ignore one or more of these physical aspects. Here a physically enhanced, coupled depth-averaged two-phase model is proposed for fluvial sediment-laden flow, which explicitly incorporates all these aspects and also turbulent Reynolds stresses. A well-balanced numerical algorithm is applied to solve the governing equations of the model. The present model is benchmarked against a series of typical cases, concerning refilling of a dredged trench, bed aggradation due to sediment overloading, and flood flows due to landslide dam failure. It features encouraging performance as compared to measured data and a quasi single-phase mixture model. The present model reveals that the larger the grain size, the slower the sediment fraction transports, which concurs with prior findings from experimental observations and field data. Also, the fluid phase Reynolds stresses are considerable where the flow rapidly varies, whilst the solid phase Reynolds stresses are negligible if sediment concentration is sufficiently low. Journal Article Advances in Water Resources 129 338 353 03091708 open channel flow, sediment-laden flow, shallow water, two-phase model, erodible bed, multi grain sizes 1 7 2019 2019-07-01 10.1016/j.advwatres.2017.08.014 COLLEGE NANME Civil Engineering COLLEGE CODE CIVL Swansea University 2019-09-23T16:30:19.3887534 2019-09-12T09:39:36.5036613 Ji Li 0000-0003-4328-3197 1 Zhixian Cao 2 Honglu Qian 3 Qingquan Liu 4 Gareth Pender 5
title A depth-averaged two-phase model for fluvial sediment-laden flows over erodible beds
spellingShingle A depth-averaged two-phase model for fluvial sediment-laden flows over erodible beds
Ji Li
title_short A depth-averaged two-phase model for fluvial sediment-laden flows over erodible beds
title_full A depth-averaged two-phase model for fluvial sediment-laden flows over erodible beds
title_fullStr A depth-averaged two-phase model for fluvial sediment-laden flows over erodible beds
title_full_unstemmed A depth-averaged two-phase model for fluvial sediment-laden flows over erodible beds
title_sort A depth-averaged two-phase model for fluvial sediment-laden flows over erodible beds
author_id_str_mv 4123c4ddbcd6e77f580974c661461c7c
author_id_fullname_str_mv 4123c4ddbcd6e77f580974c661461c7c_***_Ji Li
author Ji Li
author2 Ji Li
Zhixian Cao
Honglu Qian
Qingquan Liu
Gareth Pender
format Journal article
container_title Advances in Water Resources
container_volume 129
container_start_page 338
publishDate 2019
institution Swansea University
issn 03091708
doi_str_mv 10.1016/j.advwatres.2017.08.014
document_store_str 0
active_str 0
description Fluvial sediment-laden flow represents a class of fluid-solid two-phase flows, which typically involve multi grain sizes, interphase and particle-particle interactions, and mass exchange with the bed. However, existing depth-averaged models ignore one or more of these physical aspects. Here a physically enhanced, coupled depth-averaged two-phase model is proposed for fluvial sediment-laden flow, which explicitly incorporates all these aspects and also turbulent Reynolds stresses. A well-balanced numerical algorithm is applied to solve the governing equations of the model. The present model is benchmarked against a series of typical cases, concerning refilling of a dredged trench, bed aggradation due to sediment overloading, and flood flows due to landslide dam failure. It features encouraging performance as compared to measured data and a quasi single-phase mixture model. The present model reveals that the larger the grain size, the slower the sediment fraction transports, which concurs with prior findings from experimental observations and field data. Also, the fluid phase Reynolds stresses are considerable where the flow rapidly varies, whilst the solid phase Reynolds stresses are negligible if sediment concentration is sufficiently low.
published_date 2019-07-01T04:03:49Z
_version_ 1763753307365441536
score 11.037603

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