Interference and transmission of spatiotemporally locally forced internal waves in non-uniform stratifications
Interference and transmission of spatiotemporally locally forced internal waves in non-uniform stratifications
复制标题
非均匀层结中时空局部受迫内波的干扰与传播
DOI：
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发表时间：
2019
影响因子：
3.7
通讯作者：
T. Peacock
中科院分区：
文献类型：
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作者：
R. Supekar;T. Peacock
关于相长或相消干涉对通过非均匀分层的内波传输的影响的研究通常是针对时空谐波的内波场进行的。为了了解时空局部化的影响，我们对二维内波的传输进行了理论和实验研究，这些内波是由空间和时间上局部的边界强迫产生的。模型分析表明，足够的局域化会导致谐波强迫中出现的传输峰和谷消失。我们进行的相应实验室实验清楚地证明了这种效应。基于内波的群速度和传播角，获得了评估传输波峰或波谷何时明显的实用标准。
Studies of the effects of constructive or destructive interference on the transmission of internal waves through non-uniform stratifications have typically been performed for internal wave fields that are spatiotemporally harmonic. To understand the impacts of spatiotemporal localization, we present a theoretical and experimental study of the transmission of two-dimensional internal waves that are generated by a boundary forcing that is localized in both space and time. The model analysis reveals that sufficient localization leads to the disappearance of transmission peaks and troughs that would otherwise be present for a harmonic forcing. The corresponding laboratory experiments that we perform provide clear demonstration of this effect. Based on the group velocity and angle of propagation of the internal waves, a practical criterion that assesses when the transmission peaks or troughs are evident is obtained.