A Generalized Interpolation Material Point Method for Shallow Ice Shelves. 2: Anisotropic Nonlocal Damage Mechanics and Rift Propagation

Abstract Ice shelf fracture is responsible for roughly half of Antarctic ice mass loss in the form of calving and can weaken buttressing of upstream ice flow. Large uncertainties associated with the ice sheet response to climate variations are due to a poor understanding of these fracture processes...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Alex Huth, Ravindra Duddu, Ben Smith
Formato:	article
Lenguaje:	EN
Publicado:	American Geophysical Union (AGU) 2021
Materias:	Damage fracture glaciology ice shelves material point method particle method Physical geography GB3-5030 Oceanography GC1-1581
Acceso en línea:	https://doaj.org/article/c4d024da377e4fde840cd32717291b07
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:c4d024da377e4fde840cd32717291b07
record_format	dspace
spelling	oai:doaj.org-article:c4d024da377e4fde840cd32717291b072021-11-12T07:13:23ZA Generalized Interpolation Material Point Method for Shallow Ice Shelves. 2: Anisotropic Nonlocal Damage Mechanics and Rift Propagation1942-246610.1029/2020MS002292https://doaj.org/article/c4d024da377e4fde840cd32717291b072021-08-01T00:00:00Zhttps://doi.org/10.1029/2020MS002292https://doaj.org/toc/1942-2466Abstract Ice shelf fracture is responsible for roughly half of Antarctic ice mass loss in the form of calving and can weaken buttressing of upstream ice flow. Large uncertainties associated with the ice sheet response to climate variations are due to a poor understanding of these fracture processes and how to model them. Here, we address these problems by implementing an anisotropic, nonlocal integral formulation of creep damage within a large‐scale shallow‐shelf ice flow model. This model can be used to study the full evolution of fracture from initiation of crevassing to rifting that eventually causes tabular calving. While previous ice shelf fracture models have largely relied on simple expressions to estimate crevasse depths, our model parameterizes fracture as a progressive damage evolution process in three‐dimensions (3‐D). We also implement an efficient numerical framework based on the material point method, which avoids advection errors. Using an idealized marine ice sheet, we test the creep damage model and a crevasse‐depth based damage model, including a modified version of the latter that accounts for damage evolution due to necking and mass balance. We demonstrate that the creep damage model is best suited for capturing weakening and rifting over shorter (monthly/yearly) timescales, and that anisotropic damage reproduces typically observed fracture patterns better than isotropic damage. Because necking and mass balance can significantly influence damage on longer (decadal) timescales, we discuss the potential for a combined approach between models to best represent mechanical weakening and tabular calving within long‐term simulations.Alex HuthRavindra DudduBen SmithAmerican Geophysical Union (AGU)articleDamagefractureglaciologyice shelvesmaterial point methodparticle methodPhysical geographyGB3-5030OceanographyGC1-1581ENJournal of Advances in Modeling Earth Systems, Vol 13, Iss 8, Pp n/a-n/a (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Damage fracture glaciology ice shelves material point method particle method Physical geography GB3-5030 Oceanography GC1-1581
spellingShingle	Damage fracture glaciology ice shelves material point method particle method Physical geography GB3-5030 Oceanography GC1-1581 Alex Huth Ravindra Duddu Ben Smith A Generalized Interpolation Material Point Method for Shallow Ice Shelves. 2: Anisotropic Nonlocal Damage Mechanics and Rift Propagation
description	Abstract Ice shelf fracture is responsible for roughly half of Antarctic ice mass loss in the form of calving and can weaken buttressing of upstream ice flow. Large uncertainties associated with the ice sheet response to climate variations are due to a poor understanding of these fracture processes and how to model them. Here, we address these problems by implementing an anisotropic, nonlocal integral formulation of creep damage within a large‐scale shallow‐shelf ice flow model. This model can be used to study the full evolution of fracture from initiation of crevassing to rifting that eventually causes tabular calving. While previous ice shelf fracture models have largely relied on simple expressions to estimate crevasse depths, our model parameterizes fracture as a progressive damage evolution process in three‐dimensions (3‐D). We also implement an efficient numerical framework based on the material point method, which avoids advection errors. Using an idealized marine ice sheet, we test the creep damage model and a crevasse‐depth based damage model, including a modified version of the latter that accounts for damage evolution due to necking and mass balance. We demonstrate that the creep damage model is best suited for capturing weakening and rifting over shorter (monthly/yearly) timescales, and that anisotropic damage reproduces typically observed fracture patterns better than isotropic damage. Because necking and mass balance can significantly influence damage on longer (decadal) timescales, we discuss the potential for a combined approach between models to best represent mechanical weakening and tabular calving within long‐term simulations.
format	article
author	Alex Huth Ravindra Duddu Ben Smith
author_facet	Alex Huth Ravindra Duddu Ben Smith
author_sort	Alex Huth
title	A Generalized Interpolation Material Point Method for Shallow Ice Shelves. 2: Anisotropic Nonlocal Damage Mechanics and Rift Propagation
title_short	A Generalized Interpolation Material Point Method for Shallow Ice Shelves. 2: Anisotropic Nonlocal Damage Mechanics and Rift Propagation
title_full	A Generalized Interpolation Material Point Method for Shallow Ice Shelves. 2: Anisotropic Nonlocal Damage Mechanics and Rift Propagation
title_fullStr	A Generalized Interpolation Material Point Method for Shallow Ice Shelves. 2: Anisotropic Nonlocal Damage Mechanics and Rift Propagation
title_full_unstemmed	A Generalized Interpolation Material Point Method for Shallow Ice Shelves. 2: Anisotropic Nonlocal Damage Mechanics and Rift Propagation
title_sort	generalized interpolation material point method for shallow ice shelves. 2: anisotropic nonlocal damage mechanics and rift propagation
publisher	American Geophysical Union (AGU)
publishDate	2021
url	https://doaj.org/article/c4d024da377e4fde840cd32717291b07
work_keys_str_mv	AT alexhuth ageneralizedinterpolationmaterialpointmethodforshallowiceshelves2anisotropicnonlocaldamagemechanicsandriftpropagation AT ravindraduddu ageneralizedinterpolationmaterialpointmethodforshallowiceshelves2anisotropicnonlocaldamagemechanicsandriftpropagation AT bensmith ageneralizedinterpolationmaterialpointmethodforshallowiceshelves2anisotropicnonlocaldamagemechanicsandriftpropagation AT alexhuth generalizedinterpolationmaterialpointmethodforshallowiceshelves2anisotropicnonlocaldamagemechanicsandriftpropagation AT ravindraduddu generalizedinterpolationmaterialpointmethodforshallowiceshelves2anisotropicnonlocaldamagemechanicsandriftpropagation AT bensmith generalizedinterpolationmaterialpointmethodforshallowiceshelves2anisotropicnonlocaldamagemechanicsandriftpropagation
_version_	1718431134352670720

A Generalized Interpolation Material Point Method for Shallow Ice Shelves. 2: Anisotropic Nonlocal Damage Mechanics and Rift Propagation

Ejemplares similares