Abstract A laboratory experimental study conducted in a freshwater wave flume installed in a refrigerated room characterized the modifications of wave propagation along on-site manufactured ice covers. Monochromatic surface waves of various amplitudes and frequencies were generated and propagated through three types of ice covers: sheet ice, broken ice floes, and grease ice. This study characterized the spatial evolutions of wave height attenuation and phase speed changes. Wave phase speed increased significantly in sheet ice relative to open water values while no significant changes in phase speed were present with other ice covers. The modifications by sheet ice are consistent with thin plate model predictions based on the elasticity of ice, using measured mechanical properties of sheet ice. Attenuation was strongest for shorter waves in sheet ice followed by grease ice and ice floes. Attenuation under grease ice is shown to be related to the surface wave orbital velocity, similar to dissipation by bottom friction and swell dissipation. The attenuation coefficient of grease ice normalized by wavenumber is proportional to wave steepness with a coefficient varying with ice properties. This laboratory experimental study examined and characterized wave dispersion and attenuation under these different ice properties and wave characteristics, which could be useful in understanding and modeling wave-ice interaction processes in open waters.

中文翻译：

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不同冰盖改变面波的实验研究

摘要 在安装在冷藏室中的淡水波浪水槽中进行的实验室实验研究表征了波浪沿现场制造的冰盖传播的变化。产生各种振幅和频率的单色表面波，并通过三种类型的冰盖传播：片冰、破碎的浮冰和油脂冰。这项研究表征了波高衰减和相位速度变化的空间演变。相对于开放水域值，片冰中的波相速度显着增加，而其他冰盖的相速度没有显着变化。冰片的修改与基于冰弹性的薄板模型预测一致，使用测量的冰片机械特性。薄冰中较短波浪的衰减最强，其次是油脂冰和浮冰。润滑脂冰下的衰减与表面波轨道速度有关，类似于底部摩擦和膨胀耗散的耗散。由波数归一化的油脂冰的衰减系数与波陡度成正比，系数随冰特性而变化。该实验室实验研究检查并表征了这些不同冰特性和波浪特性下的波浪扩散和衰减，这有助于理解和模拟开阔水域的波浪-冰相互作用过程。由波数归一化的油脂冰的衰减系数与波陡度成正比，系数随冰特性而变化。该实验室实验研究检查并表征了这些不同冰特性和波浪特性下的波浪扩散和衰减，这有助于理解和模拟开阔水域的波浪-冰相互作用过程。由波数归一化的油脂冰的衰减系数与波陡度成正比，系数随冰特性而变化。该实验室实验研究检查并表征了这些不同冰特性和波浪特性下的波浪扩散和衰减，这有助于理解和模拟开阔水域的波浪-冰相互作用过程。