Modeling hydraulic fracture of glaciers using continuum damage mechanics
ABSTRACT The presence of water-filled crevasses is known to increase the penetration depth of crevasses and this has been hypothesized to play an important role controlling iceberg calving rate. Here, we develop a continuum-damage-based poro-mechanics formulation that enables the simulation of water...
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Cambridge University Press (CUP)
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crcambridgeupr:10.1017/jog.2016.68 2024-09-15T18:15:39+00:00 Modeling hydraulic fracture of glaciers using continuum damage mechanics MOBASHER, MOSTAFA E. DUDDU, RAVINDRA BASSIS, JEREMY N. WAISMAN, HAIM 2016 http://dx.doi.org/10.1017/jog.2016.68 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214301600068X en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by-nc-sa/4.0/ Journal of Glaciology volume 62, issue 234, page 794-804 ISSN 0022-1430 1727-5652 journal-article 2016 crcambridgeupr https://doi.org/10.1017/jog.2016.68 2024-08-28T04:03:28Z ABSTRACT The presence of water-filled crevasses is known to increase the penetration depth of crevasses and this has been hypothesized to play an important role controlling iceberg calving rate. Here, we develop a continuum-damage-based poro-mechanics formulation that enables the simulation of water-filled basal and surface crevasse propagation. The formulation incorporates a scalar isotropic damage variable into a Maxwell-type viscoelastic constitutive model for glacial ice, and the effect of the water pressure on fracture propagation using the concept of effective solid stress. We illustrate the model by simulating quasi-static hydrofracture in idealized rectangular slabs of ice in contact with the ocean. Our results indicate that water-filled basal crevasses only propagate when the water pressure is sufficiently large, and that the interaction between simultaneously propagating water-filled surface and basal crevasses can have a mutually positive influence leading to deeper crevasse propagation, which can critically affect glacial stability. Therefore, this study supports the hypothesis that hydraulic fracture is a plausible mechanism for the accelerated breakdown of glaciers. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Journal of Glaciology 62 234 794 804 |
institution |
Open Polar |
collection |
Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
ABSTRACT The presence of water-filled crevasses is known to increase the penetration depth of crevasses and this has been hypothesized to play an important role controlling iceberg calving rate. Here, we develop a continuum-damage-based poro-mechanics formulation that enables the simulation of water-filled basal and surface crevasse propagation. The formulation incorporates a scalar isotropic damage variable into a Maxwell-type viscoelastic constitutive model for glacial ice, and the effect of the water pressure on fracture propagation using the concept of effective solid stress. We illustrate the model by simulating quasi-static hydrofracture in idealized rectangular slabs of ice in contact with the ocean. Our results indicate that water-filled basal crevasses only propagate when the water pressure is sufficiently large, and that the interaction between simultaneously propagating water-filled surface and basal crevasses can have a mutually positive influence leading to deeper crevasse propagation, which can critically affect glacial stability. Therefore, this study supports the hypothesis that hydraulic fracture is a plausible mechanism for the accelerated breakdown of glaciers. |
format |
Article in Journal/Newspaper |
author |
MOBASHER, MOSTAFA E. DUDDU, RAVINDRA BASSIS, JEREMY N. WAISMAN, HAIM |
spellingShingle |
MOBASHER, MOSTAFA E. DUDDU, RAVINDRA BASSIS, JEREMY N. WAISMAN, HAIM Modeling hydraulic fracture of glaciers using continuum damage mechanics |
author_facet |
MOBASHER, MOSTAFA E. DUDDU, RAVINDRA BASSIS, JEREMY N. WAISMAN, HAIM |
author_sort |
MOBASHER, MOSTAFA E. |
title |
Modeling hydraulic fracture of glaciers using continuum damage mechanics |
title_short |
Modeling hydraulic fracture of glaciers using continuum damage mechanics |
title_full |
Modeling hydraulic fracture of glaciers using continuum damage mechanics |
title_fullStr |
Modeling hydraulic fracture of glaciers using continuum damage mechanics |
title_full_unstemmed |
Modeling hydraulic fracture of glaciers using continuum damage mechanics |
title_sort |
modeling hydraulic fracture of glaciers using continuum damage mechanics |
publisher |
Cambridge University Press (CUP) |
publishDate |
2016 |
url |
http://dx.doi.org/10.1017/jog.2016.68 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214301600068X |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 62, issue 234, page 794-804 ISSN 0022-1430 1727-5652 |
op_rights |
http://creativecommons.org/licenses/by-nc-sa/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2016.68 |
container_title |
Journal of Glaciology |
container_volume |
62 |
container_issue |
234 |
container_start_page |
794 |
op_container_end_page |
804 |
_version_ |
1810453563317420032 |