气候变化领域集成服务门户(CCPortal): Simulating intersection angles between conjugate faults in sea ice with different viscous-plastic rheologies

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DOI	10.5194/tc-13-1167-2019
	Simulating intersection angles between conjugate faults in sea ice with different viscous-plastic rheologies
	Ringeisen D.; Losch M.; Bruno Tremblay L.; Hutter N.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	1167
结束页码	1186
卷号	13 期号:4
英文摘要	Recent high-resolution pan-Arctic sea ice simulations show fracture patterns (linear kinematic features or LKFs) that are typical of granular materials but with wider fracture angles than those observed in high-resolution satellite images. Motivated by this, ice fracture is investigated in a simple uni-axial loading test using two different viscous-plastic (VP) rheologies: one with an elliptical yield curve and a normal flow rule and one with a Coulombic yield curve and a normal flow rule that applies only to the elliptical cap. With the standard VP rheology, it is not possible to simulate fracture angles smaller than 30g. Further, the standard VP model is not consistent with the behavior of granular material such as sea ice because (1) the fracture angle increases with ice shear strength; (2) the divergence along the fracture lines (or LKFs) is uniquely defined by the shear strength of the material with divergence for high shear strength and convergent with low shear strength; (3) the angle of fracture depends on the confining pressure with more convergence as the confining pressure increases. This behavior of the VP model is connected to the convexity of the yield curve together with use of a normal flow rule. In the Coulombic model, the angle of fracture is smaller (θ=23°) and grossly consistent with observations. The solution, however, is unstable when the compressive stress is too large because of non-differentiable corners between the straight limbs of the Coulombic yield curve and the elliptical cap. The results suggest that, although at first sight the large-scale patterns of LKFs simulated with a VP sea ice model appear to be realistic, the elliptical yield curve with a normal flow rule is not consistent with the notion of sea ice as a pressure-sensitive and dilatant granular material. © 2019 Author(s).
学科领域	confining pressure; ice breakup; loading test; plastic; rheology; satellite imagery; sea ice; shear strength; uniaxial test; viscous flow; Arctic Ocean
语种	英语
scopus关键词	confining pressure; ice breakup; loading test; plastic; rheology; satellite imagery; sea ice; shear strength; uniaxial test; viscous flow; Arctic Ocean
来源期刊	The Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118896
作者单位	Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar und Meeresforschung (AWI), Bremerhaven, Germany; Department of Atmospheric and Oceanic Sciences, McGill University, Montréal, QC, Canada
推荐引用方式 GB/T 7714	Ringeisen D.,Losch M.,Bruno Tremblay L.,et al. Simulating intersection angles between conjugate faults in sea ice with different viscous-plastic rheologies[J],2019,13(4).
APA	Ringeisen D.,Losch M.,Bruno Tremblay L.,&Hutter N..(2019).Simulating intersection angles between conjugate faults in sea ice with different viscous-plastic rheologies.The Cryosphere,13(4).
MLA	Ringeisen D.,et al."Simulating intersection angles between conjugate faults in sea ice with different viscous-plastic rheologies".The Cryosphere 13.4(2019).