DOI: 10.5194/tc-10-1339-2016
Scopus记录号: 2-s2.0-84977147506
论文题名: A Maxwell elasto-brittle rheology for sea ice modelling
作者: Dansereau V ; , Weiss J ; , Saramito P ; , Lattes P
刊名: Cryosphere
ISSN: 19940416
出版年: 2016
卷: 10, 期: 3 起始页码: 1339
结束页码: 1359
语种: 英语
英文关键词: advection
; anisotropy
; brittle deformation
; elastic modulus
; ice cover
; ice mechanics
; mechanical property
; rheology
; rock mechanics
; sea ice
; timescale
英文摘要: A new rheological model is developed that builds on an elasto-brittle (EB) framework used for sea ice and rock mechanics, with the intent of representing both the small elastic deformations associated with fracturing processes and the larger deformations occurring along the faults/leads once the material is highly damaged and fragmented. A viscous-like relaxation term is added to the linear-elastic constitutive law together with an effective viscosity that evolves according to the local level of damage of the material, like its elastic modulus. The coupling between the level of damage and both mechanical parameters is such that within an undamaged ice cover the viscosity is infinitely large and deformations are strictly elastic, while along highly damaged zones the elastic modulus vanishes and most of the stress is dissipated through permanent deformations. A healing mechanism is also introduced, counterbalancing the effects of damaging over large timescales. In this new model, named Maxwell-EB after the Maxwell rheology, the irreversible and reversible deformations are solved for simultaneously; hence drift velocities are defined naturally. First idealized simulations without advection show that the model reproduces the main characteristics of sea ice mechanics and deformation: strain localization, anisotropy, intermittency and associated scaling laws. © Author(s) 2016. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75123
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Laboratoire de Glaciologie et Géophysique de l'Environnement, CNRS UMR 5183, Université de Grenoble, Grenoble, France; Institut des Sciences de la Terre, CNRS UMR 5275, Université de Grenoble, Grenoble, France; Laboratoire Jean Kuntzmann, CNRS UMR 5224, Université de Grenoble, Grenoble, France; TOTAL S.A. - DGEP/DEV/TEC/GEO, Paris, France
Recommended Citation:
Dansereau V,, Weiss J,, Saramito P,et al. A Maxwell elasto-brittle rheology for sea ice modelling[J]. Cryosphere,2016-01-01,10(3)