Behavior of flexural gravity waves on ice shelves: Application to the Ross Ice Shelf
Behavior of flexural gravity waves on ice shelves: Application to the Ross Ice Shelf
复制标题
冰架上弯曲重力波的行为：在罗斯冰架上的应用
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
O. Sergienko
中科院分区：
文献类型：
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作者：
O. Sergienko
海浪不断地撞击漂浮的冰架，并影响它们的应力状态。低频、长周期（75-400 s）的海浪能够从远距离源到达冰架空腔，并激发弯曲重力波，该弯曲重力波代表空腔和上面的冰层的水中的耦合运动。这些弯曲重力波应用到罗斯冰架的简化的几何配置和三维数值模拟的分析处理表明，传播和冰架弯曲应力强烈控制系统的几何形状，水深的冰架腔，和冰架腔厚度。导出的色散关系，群和这些波的相速度可以用来推断不良约束的冰架从现场观测的特点。数值模拟结果表明，弯曲重力波以梁的形式传播。这些光束的方向是由入射到冰架前的开阔海浪的方向决定的。较高频率的海浪引起较大的弯曲应力，而较低频率的海浪可以传播到远离冰架前缘的地方，并在接地线附近引起弯曲应力。
Ocean waves continuously impact floating ice shelves and affect their stress regime. Low-frequency, long-period (75-400 s), ocean waves are able to reach ice-shelf cavities from distant sources and excite flexural gravity waves that represent coupled motion in the water of the cavity and the ice covering above. Analytic treatment of simplified geometric configuration and three-dimensional numerical simulations of these flexural gravity waves applied to the Ross Ice Shelf show that propagation and ice-shelf flexural stresses are strongly controlled by the geometry of the system, bathymetry of the ice-shelf cavity, and ice-shelf cavity thickness. The derived dispersion relationships, group and phase velocities of these waves can be used to infer poorly constrained characteristics of ice shelves from field observations. The results of numerical simulations show that the flexural gravity waves propagate as beams. The orientation of these beams is determined by the direction of the open ocean waves incident on the ice-shelf front. The higher frequency ocean waves cause larger flexural stresses, while lower frequency waves can propagate farther away from the ice-shelf front and cause flexural stresses in the vicinity of the grounding line.