A one-dimensional model for wave-induced ice-floe collisions
A one-dimensional model for wave-induced ice-floe collisions
复制标题
波浪引起的浮冰碰撞的一维模型
DOI：
10.3189/1991aog15-1-87-95
复制
发表时间：
1991
影响因子：
2.9
通讯作者：
S. Ackley
中科院分区：
文献类型：
--
作者：
H. Shen;S. Ackley
在这项研究中，浮冰的碰撞作用下的单调波量化。波浪引起的浮冰的横向运动被模拟为物体在重力作用下的滑动。在这种情况下，当波浪通过絮凝物前进时，运动方向上的重力分量随时间和空间而变化。模型中包括拖曳和添加的质量效应。位于不同位置的两块浮冰显示出其漂移的净差异（仅由重复的波浪通道引起）。在大多数情况下，这种差异漂移最终导致浮冰碰撞。当两块浮冰发生碰撞时，采用弹簧-阻尼器模型计算接触力。一维波通过一个一维阵列的盘形絮凝物进行检查。从分析中可以明显看出两个现象。第一，波浪具有聚集效应，形成宽度等于波长的浮冰带。其次，碰撞频率对絮体的弹性性质和波幅敏感。如实地研究中所观察到的那样，当两块絮凝物碰撞时，阻尼常数值足够大时，絮凝物会长时间保持接触，这表明有可能冻结在一起，形成复合絮凝物。
In this study, the collision of ice floes under the action of a monotonic wave is quantified. The lateral motion of an ice floe caused by the wave is modeled as the sliding of an object under gravity. In this case, the gravity component in the direction of motion varies with time and space as the wave progresses by the floe. Drag and added mass effects are included in the model. Two floes located at different positions are shown to have a net difference in their drift (caused only be repeated wave passages). In most cases, this differential drift eventually causes floe collision. When two floes collide, a spring and dash-pot model is adopted to calculate the contact force. A one-dimensional wave passing through a one-dimensional array of disc-shaped floes is examined. Two phenomena are apparent from the analysis. First, waves have a herding effect that forms bands of floes with the width equal to the wavelength. Secondly, the frequency of collision is sensitive to the elastic properties of the floes and the wave amplitude. With sufficient values of the damping constant, which operates when two floes collide, the floes stay in contact for prolonged periods, indicating the potential to freeze together and form composite floes, as was observed in the field studies.