Swell-induced flexural vibrations of a thickening ice shelf over a shoaling seabed
Swell-induced flexural vibrations of a thickening ice shelf over a shoaling seabed
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浅滩海床上加厚冰架的膨胀引起的弯曲振动
DOI：
10.1098/rspa.2021.0173
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
L. Bennetts
中科院分区：
文献类型：
--
作者：
M. Meylan;M. Ilyas;B. Lamichhane;L. Bennetts
针对冰架厚度和冰架下海床随距离变化、冰架/下冰架空腔与远洋相连的线性模型，提出了一种求解波浪作用下冰架弯曲振动的方法。该方法结合了在规定的运动频率下将冰架位移剖面分解为自由振动的模态形状，结合了空腔水运动的有限元方法以及连接到开放海洋的非局部操作员。研究了在涌浪状态下，由规则入射波引起的冰架时谐振动在冰架加厚、海底浅滩化和接地线条件下的影响。此外，通过叠加时谐响应，给出了不规则入射波作用下冰架振动的结果，并推导了海洋到冰架的传递函数。这些发现进一步证明，冰架在膨胀时经历了明显的弯曲振动，而且冰架变厚和海底变浅对预测冰架对海浪的反应有相当大的影响。
A solution method is developed for a linear model of ice shelf flexural vibrations in response to ocean waves, in which the ice shelf thickness and seabed beneath the ice shelf vary over distance, and the ice shelf/sub–ice-shelf cavity are connected to the open ocean. The method combines a decomposition of the ice shelf displacement profile at a prescribed frequency of motion into mode shapes of free vibrations, a finite-element method for the cavity water motion and a non-local operator to connect to the open ocean. An investigation is conducted into the effects of ice shelf thickening, seabed shoaling and the grounding-line conditions on time-harmonic ice shelf vibrations, induced by regular incident waves in the swell regime. Furthermore, results are given for ice shelf vibrations in response to irregular incident waves by superposing time-harmonic responses, and ocean-to-ice-shelf transfer functions are derived. The findings add to evidence that ice shelves experience appreciable flexural vibrations in response to swell, and that ice shelf thickening and seabed shoaling can have a considerable influence on predictions of how ice shelves respond to ocean waves.
与海洋重力波活动相关的罗斯冰架冰震
影响因子：
5.2
作者：
Chen, Z.;Bromirski, P. D.;Gerstoft, P.;Stephen, R. A.;Lee, W. S.;Yun, S.;Olinger, S. D.;Aster, R. C.;Wiens, D. A.;Nyblade, A. A.
通讯作者：
Nyblade, A. A.
影响因子：
5.2
作者：
Gudmundsson, G. H.
通讯作者：
Gudmundsson, G. H.