Treatment of ice-shelf evolution combining flow and flexure

Treatment of ice-shelf evolution combining flow and flexure
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结合流动和弯曲处理冰架演化

DOI:
10.1017/jog.2021.39
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发表时间:
2021
影响因子:
3.4
通讯作者:
Stevens, Laura A.
Stevens, Laura A.
中科院分区:
地球科学3区
文献类型:
--
作者:
MacAyeal, Douglas R.;Sergienko, Olga V.;Banwell, Alison F.;Macdonald, Grant J.;Willis, Ian C.;Stevens, Laura A.

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我们开发了一个二维的,平面图制定的冰架流动和粘弹性冰架弯曲。该公式首次结合了水平冰架流的浅水近似(以及润滑床上流的浅水近似,如冰上升和褶皱形成的地方)和薄板弯曲的处理。我们证明了治疗进行两个有限元模拟:一个残留的残留的湖泊功能,存在于一些碎片覆盖的冰架,由于强烈的异质性表面消融,和其他的冰褶皱在接地区的冰上升。所提出的处理开辟了新的场所,调查物理过程,需要耦合之间的纵向变形和垂直弯曲,例如,表面融化和冰架上的冰上湖的影响,与海涌的相互作用,以及许多其他。
We develop a two-dimensional, plan-view formulation of ice-shelf flow and viscoelastic ice-shelf flexure. This formulation combines, for the first time, the shallow-shelf approximation for horizontal ice-shelf flow (and shallow-stream approximation for flow on lubricated beds such as where ice rises and rumples form), with the treatment of a thin-plate flexure. We demonstrate the treatment by performing two finite-element simulations: one of the relict pedestalled lake features that exist on some debris-covered ice shelves due to strong heterogeneity in surface ablation, and the other of ice rumpling in the grounding zone of an ice rise. The proposed treatment opens new venues to investigate physical processes that require coupling between the longitudinal deformation and vertical flexure, for instance, the effects of surface melting and supraglacial lakes on ice shelves, interactions with the sea swell, and many others.
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