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首页> 外文期刊>Journal of Physical Oceanography >A Study of Low-Frequency, Wind-Driven, Coastal-Trapped Waves along the Southeast Coast of Australia
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A Study of Low-Frequency, Wind-Driven, Coastal-Trapped Waves along the Southeast Coast of Australia

机译：澳大利亚东南沿海的低频，风驱动，沿海被困波研究

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摘要

Coastal-trapped waves (CTWs) along the southeast coast of Australia were investigated based on a frictional, wind-driven long-wave theory. It was found that low-frequency sea level anomalies (SLAs) were continuously propagating from the south coast up along the east coast as CTWs, mainly forced by the alongshore wind stress. Three main subinertial peaks existed in the spectral characteristics of the SLAs, with periods of 14.2, 10.2, and 7.8 days, respectively. Power spectral density distributions of the peaks showed that the CTW amplitudes varied significantly along the southeast coast. For idealized linear and exponential shelves, a theoretical analysis indicated that the fundamental factor influencing the eigenvector of mode 1, and therefore the CTW amplitude, was the offshore water depth. This theoretical work was well supported by eight sensitivity cases. Four additional cases were conducted, and time-averaged energy fluxes were calculated to identify the energy source of the CTWs in the Australian Coastal Experiment (ACE) region. It was shown that both the local wind stress and the wind stress in Bass Strait contributed to the CTWs in the ACE region, with the latter playing a more important role. The remaining CTW energy came from remote forcing farther west of Bass Strait. The energy flux calculation also showed that the CTW energy flux was almost constant along the investigated coast because of the balance between frictional dissipation and the energy gain from the alongshore wind stress; the significant variations in the power spectral density (PSD) of the subinertial peaks were mainly due to the variations in the modal eigenvectors caused by the shelf geometry.
机译：基于摩擦，风驱动的长波理论，研究了澳大利亚东南沿海的沿海陷波（CTW）。研究发现，低频海平面异常（SLA）从南海岸一直沿东海岸作为CTW不断传播，主要是由沿岸风应力推动。 SLA的光谱特征中存在三个主要的惯性峰，分别为14.2、10.2和7.8天。峰值的功率谱密度分布表明，CTW振幅沿东南沿海有显着变化。对于理想的线性和指数层架，理论分析表明，影响模式1特征向量的基本因素以及CTW振幅是离岸水深。八个敏感性案例很好地支持了这一理论工作。进行了另外四个案例，并计算了时间平均能量通量，以识别澳大利亚沿海实验（ACE）区域中CTW的能源。结果表明，巴斯海峡的局部风应力和风应力都对ACE地区的CTW有所贡献，而后者在其中发挥了更为重要的作用。其余的CTW能量来自遥远的强迫作用于巴斯海峡以西的地方。能量通量的计算还表明，由于摩擦耗散与沿岸风应力获得的能量之间的平衡，CTW能量通量在被调查海岸几乎恒定。亚惯性峰的功率谱密度（PSD）的显着变化主要是由于架子几何结构引起的模态特征向量的变化。

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