Water-pressure Coupling of Sliding and Bed Deformation: III. Application to Ice Stream B, Antarctica
Water-pressure Coupling of Sliding and Bed Deformation: III. Application to Ice Stream B, Antarctica
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滑动与床层变形的水压耦合：III．
DOI：
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发表时间：
1989
影响因子：
3.4
通讯作者：
C. R. Bentley
中科院分区：
文献类型：
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作者：
R. Alley;Donald D. Blankenship;S. Rooney;C. R. Bentley
地球物理研究和冰川学分析表明，西南极洲冰流B主要是通过冰下冰碛物的普遍变形而运动的。对冰原上游冰流纵向剖面的分析表明，基底滑动在各处都是缓慢的，有效压力在下游缓慢下降，普遍剪切的应变率与基底剪切应力成正比，与有效压力的平方或立方成反比。离散剪切可能发生在渗透变形区之下。这些假设和其他假设建立在本系列前两篇论文的分析基础上，可以在实地进行检验。
Abstract Geophysical studies and glaciological analyses suggest strongly that Ice Stream B, West Antarctica, moves primarily by pervasive deformation of a meters thick subglacial till. Analysis of the longitudinal profile of the ice stream up-stream of the ice plain suggests that basal sliding is slow everywhere, that effective pressure decreases slowly down-stream, and that the strain-rate of pervasive shear is proportional to the basal shear stress and inversely proportional to the square or cube of the effective pressure. Discrete shearing may occur beneath the pervasively deforming zone. These and other hypotheses, which build on the analyses of the first two papers in this series, can be tested in the field.