Journal article 646 views 137 downloads
Grain‐energy release governs mobility of debris flow due to solid–liquid mass release
Earth Surface Processes and Landforms, Volume: 45, Issue: 12, Pages: 2912 - 2926
Swansea University Author:
Ji Li
-
PDF | Accepted Manuscript
Download (2.22MB)
DOI (Published version): 10.1002/esp.4939
Abstract
Debris flows often exhibit high mobility, leading to extensive hazards far from their sources. Although it is known that debris flow mobility increases with initial volume, the underlying mechanism remains uncertain. Here, we reconstruct the mobility–volume relation for debris flows using a recent d...
Published in: | Earth Surface Processes and Landforms |
---|---|
ISSN: | 0197-9337 1096-9837 |
Published: |
Wiley
2020
|
Online Access: |
Check full text
|
URI: | https://cronfa.swan.ac.uk/Record/cronfa54587 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
first_indexed |
2020-07-23T14:37:16Z |
---|---|
last_indexed |
2020-11-06T04:16:00Z |
id |
cronfa54587 |
recordtype |
SURis |
fullrecord |
<?xml version="1.0"?><rfc1807><datestamp>2020-11-05T15:35:26.0921563</datestamp><bib-version>v2</bib-version><id>54587</id><entry>2020-09-23</entry><title>Grain‐energy release governs mobility of debris flow due to solid–liquid mass release</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>2020-09-23</date><deptcode>CIVL</deptcode><abstract>Debris flows often exhibit high mobility, leading to extensive hazards far from their sources. Although it is known that debris flow mobility increases with initial volume, the underlying mechanism remains uncertain. Here, we reconstruct the mobility–volume relation for debris flows using a recent depth‐averaged two‐phase flow model without evoking a reduced friction coefficient, challenging currently prevailing friction‐reduction hypotheses. Physical experimental debris flows driven by solid–liquid mass release and extended numerical cases at both laboratory and field scales are resolved by the model. For the first time, we probe into the energetics of the debris flows and find that, whilst the energy balance holds and fine and coarse grains play distinct roles in debris flow energetics, the grains as a whole release energy to the liquid due to inter‐phase and inter‐grain size interactions, and this grain‐energy release correlates closely with mobility. Despite uncertainty arising from the model closures, our results provide insight into the fundamental mechanisms operating in debris flows. We propose that debris flow mobility is governed by grain‐energy release, thereby facilitating a bridge between mobility and internal energy transfer. The initial volume of debris flow is inadequate for characterizing debris flow mobility, and a friction‐reduction mechanism is not a prerequisite for the high mobility of debris flows. By contrast, inter‐phase and inter‐grain size interactions play primary roles and should be incorporated explicitly in debris flow models. Our findings are qualitatively encouraging and physically meaningful, providing implications not only for assessing future debris flow hazards and informing mitigation and adaptation strategies, but also for unravelling a spectrum of earth surface processes including heavily sediment‐laden floods, subaqueous debris flows and turbidity currents in rivers, reservoirs, estuaries, and ocean.</abstract><type>Journal Article</type><journal>Earth Surface Processes and Landforms</journal><volume>45</volume><journalNumber>12</journalNumber><paginationStart>2912</paginationStart><paginationEnd>2926</paginationEnd><publisher>Wiley</publisher><placeOfPublication/><isbnPrint/><isbnElectronic/><issnPrint>0197-9337</issnPrint><issnElectronic>1096-9837</issnElectronic><keywords>debris flows; solid-liquid mass release; high mobility; mobility–volume relation; energy transfer; grain-energy release</keywords><publishedDay>30</publishedDay><publishedMonth>9</publishedMonth><publishedYear>2020</publishedYear><publishedDate>2020-09-30</publishedDate><doi>10.1002/esp.4939</doi><url/><notes/><college>COLLEGE NANME</college><department>Civil Engineering</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>CIVL</DepartmentCode><institution>Swansea University</institution><apcterm/><lastEdited>2020-11-05T15:35:26.0921563</lastEdited><Created>2020-09-23T16:07:32.5450835</Created><path><level id="1">Faculty of Science and Engineering</level><level id="2">School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering</level></path><authors><author><firstname>Zhixian</firstname><surname>Cao</surname><order>1</order></author><author><firstname>Ji</firstname><surname>Li</surname><orcid>0000-0003-4328-3197</orcid><order>2</order></author><author><firstname>Alistair</firstname><surname>Borthwick</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><document><filename>54587__17856__76c85bc0803841839b17194fbd5ad502.pdf</filename><originalFilename>Debris flow Energy transfer_AcceptedManuscript.pdf</originalFilename><uploaded>2020-08-04T21:11:13.3359588</uploaded><type>Output</type><contentLength>2333061</contentLength><contentType>application/pdf</contentType><version>Accepted Manuscript</version><cronfaStatus>true</cronfaStatus><embargoDate>2021-06-26T00:00:00.0000000</embargoDate><copyrightCorrect>true</copyrightCorrect><language>eng</language></document></documents><OutputDurs/></rfc1807> |
spelling |
2020-11-05T15:35:26.0921563 v2 54587 2020-09-23 Grain‐energy release governs mobility of debris flow due to solid–liquid mass release 4123c4ddbcd6e77f580974c661461c7c 0000-0003-4328-3197 Ji Li Ji Li true false 2020-09-23 CIVL Debris flows often exhibit high mobility, leading to extensive hazards far from their sources. Although it is known that debris flow mobility increases with initial volume, the underlying mechanism remains uncertain. Here, we reconstruct the mobility–volume relation for debris flows using a recent depth‐averaged two‐phase flow model without evoking a reduced friction coefficient, challenging currently prevailing friction‐reduction hypotheses. Physical experimental debris flows driven by solid–liquid mass release and extended numerical cases at both laboratory and field scales are resolved by the model. For the first time, we probe into the energetics of the debris flows and find that, whilst the energy balance holds and fine and coarse grains play distinct roles in debris flow energetics, the grains as a whole release energy to the liquid due to inter‐phase and inter‐grain size interactions, and this grain‐energy release correlates closely with mobility. Despite uncertainty arising from the model closures, our results provide insight into the fundamental mechanisms operating in debris flows. We propose that debris flow mobility is governed by grain‐energy release, thereby facilitating a bridge between mobility and internal energy transfer. The initial volume of debris flow is inadequate for characterizing debris flow mobility, and a friction‐reduction mechanism is not a prerequisite for the high mobility of debris flows. By contrast, inter‐phase and inter‐grain size interactions play primary roles and should be incorporated explicitly in debris flow models. Our findings are qualitatively encouraging and physically meaningful, providing implications not only for assessing future debris flow hazards and informing mitigation and adaptation strategies, but also for unravelling a spectrum of earth surface processes including heavily sediment‐laden floods, subaqueous debris flows and turbidity currents in rivers, reservoirs, estuaries, and ocean. Journal Article Earth Surface Processes and Landforms 45 12 2912 2926 Wiley 0197-9337 1096-9837 debris flows; solid-liquid mass release; high mobility; mobility–volume relation; energy transfer; grain-energy release 30 9 2020 2020-09-30 10.1002/esp.4939 COLLEGE NANME Civil Engineering COLLEGE CODE CIVL Swansea University 2020-11-05T15:35:26.0921563 2020-09-23T16:07:32.5450835 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering Zhixian Cao 1 Ji Li 0000-0003-4328-3197 2 Alistair Borthwick 3 Qingquan Liu 4 Gareth Pender 5 54587__17856__76c85bc0803841839b17194fbd5ad502.pdf Debris flow Energy transfer_AcceptedManuscript.pdf 2020-08-04T21:11:13.3359588 Output 2333061 application/pdf Accepted Manuscript true 2021-06-26T00:00:00.0000000 true eng |
title |
Grain‐energy release governs mobility of debris flow due to solid–liquid mass release |
spellingShingle |
Grain‐energy release governs mobility of debris flow due to solid–liquid mass release Ji Li |
title_short |
Grain‐energy release governs mobility of debris flow due to solid–liquid mass release |
title_full |
Grain‐energy release governs mobility of debris flow due to solid–liquid mass release |
title_fullStr |
Grain‐energy release governs mobility of debris flow due to solid–liquid mass release |
title_full_unstemmed |
Grain‐energy release governs mobility of debris flow due to solid–liquid mass release |
title_sort |
Grain‐energy release governs mobility of debris flow due to solid–liquid mass release |
author_id_str_mv |
4123c4ddbcd6e77f580974c661461c7c |
author_id_fullname_str_mv |
4123c4ddbcd6e77f580974c661461c7c_***_Ji Li |
author |
Ji Li |
author2 |
Zhixian Cao Ji Li Alistair Borthwick Qingquan Liu Gareth Pender |
format |
Journal article |
container_title |
Earth Surface Processes and Landforms |
container_volume |
45 |
container_issue |
12 |
container_start_page |
2912 |
publishDate |
2020 |
institution |
Swansea University |
issn |
0197-9337 1096-9837 |
doi_str_mv |
10.1002/esp.4939 |
publisher |
Wiley |
college_str |
Faculty of Science and Engineering |
hierarchytype |
|
hierarchy_top_id |
facultyofscienceandengineering |
hierarchy_top_title |
Faculty of Science and Engineering |
hierarchy_parent_id |
facultyofscienceandengineering |
hierarchy_parent_title |
Faculty of Science and Engineering |
department_str |
School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering |
document_store_str |
1 |
active_str |
0 |
description |
Debris flows often exhibit high mobility, leading to extensive hazards far from their sources. Although it is known that debris flow mobility increases with initial volume, the underlying mechanism remains uncertain. Here, we reconstruct the mobility–volume relation for debris flows using a recent depth‐averaged two‐phase flow model without evoking a reduced friction coefficient, challenging currently prevailing friction‐reduction hypotheses. Physical experimental debris flows driven by solid–liquid mass release and extended numerical cases at both laboratory and field scales are resolved by the model. For the first time, we probe into the energetics of the debris flows and find that, whilst the energy balance holds and fine and coarse grains play distinct roles in debris flow energetics, the grains as a whole release energy to the liquid due to inter‐phase and inter‐grain size interactions, and this grain‐energy release correlates closely with mobility. Despite uncertainty arising from the model closures, our results provide insight into the fundamental mechanisms operating in debris flows. We propose that debris flow mobility is governed by grain‐energy release, thereby facilitating a bridge between mobility and internal energy transfer. The initial volume of debris flow is inadequate for characterizing debris flow mobility, and a friction‐reduction mechanism is not a prerequisite for the high mobility of debris flows. By contrast, inter‐phase and inter‐grain size interactions play primary roles and should be incorporated explicitly in debris flow models. Our findings are qualitatively encouraging and physically meaningful, providing implications not only for assessing future debris flow hazards and informing mitigation and adaptation strategies, but also for unravelling a spectrum of earth surface processes including heavily sediment‐laden floods, subaqueous debris flows and turbidity currents in rivers, reservoirs, estuaries, and ocean. |
published_date |
2020-09-30T04:08:13Z |
_version_ |
1763753583997616128 |
score |
11.021648 |