globalchange  > 影响、适应和脆弱性
DOI: 10.5194/tc-7-1591-2013
Scopus记录号: 2-s2.0-84885443048
论文题名:
A particle based simulation model for glacier dynamics
作者: Åström J; A; , Riikilä T; I; , Tallinen T; , Zwinger T; , Benn D; , Moore J; C; , Timonen J
刊名: Cryosphere
ISSN: 19940416
出版年: 2013
卷: 7, 期:5
起始页码: 1591
结束页码: 1602
语种: 英语
英文关键词: brittle deformation ; computer simulation ; cryosphere ; friction ; glacier dynamics ; ice mechanics ; iceberg calving ; numerical model ; size distribution ; Stokes formula ; viscosity
英文摘要: A particle-based computer simulation model was developed for investigating the dynamics of glaciers. In the model, large ice bodies are made of discrete elastic particles which are bound together by massless elastic beams. These beams can break, which induces brittle behaviour. At loads below fracture, beams may also break and reform with small probabilities to incorporate slowly deforming viscous behaviour in the model. This model has the advantage that it can simulate important physical processes such as ice calving and fracturing in a more realistic way than traditional continuum models. For benchmarking purposes the deformation of an ice block on a slip-free surface was compared to that of a similar block simulated with a Finite Element full-Stokes continuum model. Two simulations were performed: (1) calving of an ice block partially supported in water, similar to a grounded marine glacier terminus, and (2) fracturing of an ice block on an inclined plane of varying basal friction, which could represent transition to fast flow or surging. Despite several approximations, including restriction to two-dimensions and simplified water-ice interaction, the model was able to reproduce the size distributions of the debris observed in calving, which may be approximated by universal scaling laws. On a moderate slope, a large ice block was stable and quiescent as long as there was enough of friction against the substrate. For a critical length of frictional contact, global sliding began, and the model block disintegrated in a manner suggestive of a surging glacier. In this case the fragment size distribution produced was typical of a grinding process. © Author(s) 2013.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74934
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: CSC - IT Center for Science, P.O. Box 405, 02101, Esbo, Finland; Department of Physics, University of Jyväskylä, P.O. Box 35 (YFL), 40014, Jyväskylä, Finland; Department of Geology, University Centre in Svalbard, 9171 Longyearbyen, Norway; School of Geography and Geosciences, University of St Andrews, Fife, KY16 8ST, United Kingdom; State Key Laboratory of Earth Surface Processes and Resource Ecology, College of Global Change and Earth System Science, Beijing Normal University, Beijing, China; Arctic Centre, University of Lapland, PL122, 96100 Rovaniemi, Finland; Department of Earth Sciences, Uppsala University, Villavägen 16, Uppsala, 75236, Sweden

Recommended Citation:
Åström J,A,, Riikilä T,et al. A particle based simulation model for glacier dynamics[J]. Cryosphere,2013-01-01,7(5)
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