Taylor‐Noonan, A.M., Bowman, E.T. orcid.org/0000-0001-7868-6688, McArdell, B.W. et al. (3 more authors) (2022) Influence of pore fluid on grain‐scale interactions and mobility of granular flows of differing volume. Journal of Geophysical Research: Earth Surface, 127 (12). e2022JF006622. ISSN 2169-9003
Abstract
The presence of a pore fluid is recognized to significantly increase the mobility of saturated over dry granular flows. However, the mechanisms through which pore fluid increases mobility may not be captured in experimental flows of small volume typical of laboratory conditions. Here we present the results of dry and initially fluid saturated or “wet” experimental flows of near-monodisperse coarse-grained ceramic particles in a large laboratory flume for five source volumes of 0.2 to 1.0 m3. Measurements include flow height, velocity profile, pore pressure, and evolving solid volume fraction, as well as the final deposit shape. The dry experiments constrain the frictional properties of the common granular material and comparison with wet flows permits an independent evaluation of the interstitial fluid effects. These results demonstrate that flow dilation and strong variation in the velocity profile are directly linked to a greatly increased mobility for wet granular flows compared to dry, and a significant influence of scale as controlled by source volume on flow behaviour. Excess pore pressure need not be present for these effects to occur.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2022. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, (http://creativecommons.org/licenses/by/4.0/) which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
Keywords: | debris flow; landslide; mobility; granular flow; pore fluid; flume |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Civil and Structural Engineering (Sheffield) |
Funding Information: | Funder Grant number LEVERHULME TRUST (THE) IN-2016-041 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 30 Nov 2022 12:19 |
Last Modified: | 09 Dec 2022 12:25 |
Status: | Published |
Publisher: | American Geophysical Union (AGU) |
Refereed: | Yes |
Identification Number: | 10.1029/2022jf006622 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:193920 |