Subcritical crack propagation in glacial quarrying during subglacial water pressure variation
Glacial quarrying stems from the fracturing of subglacial bedrock. Much evidence shows that subcritical crack propagation of bedrock is closely related to subglacial water pressure fluctuations. Here we employ a model that assesses the impact of subglacial water pressure fluctuation on cavity length...
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Cambridge University Press
2023
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Online Access: | https://doi.org/10.1017/jog.2022.126 https://doaj.org/article/c09f2ed5f7cf4bcb9e8dc6f6abdbf9b1 |
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ftdoajarticles:oai:doaj.org/article:c09f2ed5f7cf4bcb9e8dc6f6abdbf9b1 2023-08-20T04:07:38+02:00 Subcritical crack propagation in glacial quarrying during subglacial water pressure variation Lin Li Yipeng Huang Ningchuan Su 2023-08-01T00:00:00Z https://doi.org/10.1017/jog.2022.126 https://doaj.org/article/c09f2ed5f7cf4bcb9e8dc6f6abdbf9b1 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143022001265/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2022.126 0022-1430 1727-5652 https://doaj.org/article/c09f2ed5f7cf4bcb9e8dc6f6abdbf9b1 Journal of Glaciology, Vol 69, Pp 1071-1079 (2023) Crack propagation glacial quarrying water pressure fluctuation Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2023 ftdoajarticles https://doi.org/10.1017/jog.2022.126 2023-07-30T00:36:44Z Glacial quarrying stems from the fracturing of subglacial bedrock. Much evidence shows that subcritical crack propagation of bedrock is closely related to subglacial water pressure fluctuations. Here we employ a model that assesses the impact of subglacial water pressure fluctuation on cavity length and subcritical crack propagation, while analyzing the effect of a pre-existing crack location using a phase-field model (PFM). Our results indicate that the cavity length is reduced during diurnal fluctuations in water pressure. There are two patterns of subcritical crack propagation on the corner of the step. The first stems from a rapid drop in water pressure. The second occurs after the water pressure recovers from the fluctuation to the initial steady state. This pattern is a consequence of enhanced stress concentration on the step since the modeled cavity length exceeds its steady value and has higher efficiency in promoting subcritical crack propagation. Additionally, based on the PFM results, we speculate that the subcritical crack initiation and propagation happen on a broader scale, including the ice-bed contact region and its adjacent region. Our findings imply that the duration of subcritical crack propagation is short and typically ceases once the cavity length adjusts to reduced water pressure levels. Article in Journal/Newspaper Journal of Glaciology Directory of Open Access Journals: DOAJ Articles Journal of Glaciology 1 9 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Crack propagation glacial quarrying water pressure fluctuation Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Crack propagation glacial quarrying water pressure fluctuation Environmental sciences GE1-350 Meteorology. Climatology QC851-999 Lin Li Yipeng Huang Ningchuan Su Subcritical crack propagation in glacial quarrying during subglacial water pressure variation |
topic_facet |
Crack propagation glacial quarrying water pressure fluctuation Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
Glacial quarrying stems from the fracturing of subglacial bedrock. Much evidence shows that subcritical crack propagation of bedrock is closely related to subglacial water pressure fluctuations. Here we employ a model that assesses the impact of subglacial water pressure fluctuation on cavity length and subcritical crack propagation, while analyzing the effect of a pre-existing crack location using a phase-field model (PFM). Our results indicate that the cavity length is reduced during diurnal fluctuations in water pressure. There are two patterns of subcritical crack propagation on the corner of the step. The first stems from a rapid drop in water pressure. The second occurs after the water pressure recovers from the fluctuation to the initial steady state. This pattern is a consequence of enhanced stress concentration on the step since the modeled cavity length exceeds its steady value and has higher efficiency in promoting subcritical crack propagation. Additionally, based on the PFM results, we speculate that the subcritical crack initiation and propagation happen on a broader scale, including the ice-bed contact region and its adjacent region. Our findings imply that the duration of subcritical crack propagation is short and typically ceases once the cavity length adjusts to reduced water pressure levels. |
format |
Article in Journal/Newspaper |
author |
Lin Li Yipeng Huang Ningchuan Su |
author_facet |
Lin Li Yipeng Huang Ningchuan Su |
author_sort |
Lin Li |
title |
Subcritical crack propagation in glacial quarrying during subglacial water pressure variation |
title_short |
Subcritical crack propagation in glacial quarrying during subglacial water pressure variation |
title_full |
Subcritical crack propagation in glacial quarrying during subglacial water pressure variation |
title_fullStr |
Subcritical crack propagation in glacial quarrying during subglacial water pressure variation |
title_full_unstemmed |
Subcritical crack propagation in glacial quarrying during subglacial water pressure variation |
title_sort |
subcritical crack propagation in glacial quarrying during subglacial water pressure variation |
publisher |
Cambridge University Press |
publishDate |
2023 |
url |
https://doi.org/10.1017/jog.2022.126 https://doaj.org/article/c09f2ed5f7cf4bcb9e8dc6f6abdbf9b1 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology, Vol 69, Pp 1071-1079 (2023) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143022001265/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2022.126 0022-1430 1727-5652 https://doaj.org/article/c09f2ed5f7cf4bcb9e8dc6f6abdbf9b1 |
op_doi |
https://doi.org/10.1017/jog.2022.126 |
container_title |
Journal of Glaciology |
container_start_page |
1 |
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9 |
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1774719417160040448 |