Comparison of viscoelastic-type models for ocean wave attenuation in ice-covered seas
Comparison of viscoelastic-type models for ocean wave attenuation in ice-covered seas
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DOI：
10.1002/2015jc010881
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发表时间：
2015-09-01
影响因子：
3.6
通讯作者：
Squire, Vernon A.
中科院分区：
文献类型：
--
作者：
Mosig, Johannes E. M.;Montiel, Fabien;Squire, Vernon A.
本文考虑了描述海冰密集海域中海浪传播的连续介质模型，其中表层海洋层（包括浮冰、冲击冰等）是由一个均匀的粘弹性材料，使波衰减，因为他们通过媒体传播。比较了三种冰层模型，即目前在谱波模型WAVEWATCH III（R）中试验的粘弹性流体层模型和两种较简单的粘弹性薄梁模型。这三个模型都是二维的。比较分析表明，梁模型之一提供了类似的预测波的衰减和波长的粘弹性流体模型。以南极边缘冰区最近采集的波浪衰减资料为例，对这三个模型进行了标定。虽然与所有三个模型的数据一致，确定了几个重要的问题，粘弹性流体模型，提出了问题，其是否适合描述波在冰封的海洋衰减。粘弹性梁模型似乎提供了一个更强大的参数化的现象被建模，但仍然是一个有效的表征波冰相互作用一般值得怀疑。
Continuum-based models that describe the propagation of ocean waves in ice-infested seas are considered, where the surface ocean layer (including ice floes, brash ice, etc.) is modeled by a homogeneous viscoelastic material which causes waves to attenuate as they travel through the medium. Three ice layer models are compared, namely a viscoelastic fluid layer model currently being trialed in the spectral wave model WAVEWATCH III (R) and two simpler viscoelastic thin beam models. All three models are two dimensional. A comparative analysis shows that one of the beam models provides similar predictions for wave attenuation and wavelength to the viscoelastic fluid model. The three models are calibrated using wave attenuation data recently collected in the Antarctic marginal ice zone as an example. Although agreement with the data is obtained with all three models, several important issues related to the viscoelastic fluid model are identified that raise questions about its suitability to characterize wave attenuation in ice-covered seas. Viscoelastic beam models appear to provide a more robust parameterization of the phenomenon being modeled, but still remain questionable as a valid characterization of wave-ice interactions generally.