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首页> 外文期刊>Ocean Dynamics >Nonlinear and directional effects on wave predictions over muddy bottoms: central chenier plain coast, Western Louisiana Shelf, USA
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Nonlinear and directional effects on wave predictions over muddy bottoms: central chenier plain coast, Western Louisiana Shelf, USA

机译：非线性和方向性影响波对泥泞底部的预测：中部谢尼尔平原海岸，西路易斯安那州架子，美国

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摘要

The sensitivity of wave-mud interaction on directionality and nonlinearity is investigated. A phase-resolving nonlinear wave model which accounts for directional wave propagation and mud damping is used to simulate wave propagation over a muddy shelf. Field data from an experiment conducted at the central chenier plain coast, western Louisiana, USA are used to validate the model. Recently, verification of a one-dimensional wave model with the field data showed that this model was able to replicate the evolution of wave spectra over muddy bottoms. In this study, unidirectional wave spectra were also run through the parabolic model, but with various initial angles. Linear wave model runs were also performed in order to gauge the effect of nonlinear evolution on the results. Significant wave height and total energy contained in three different spectral bands from the model are compared to the data over the shelf, and correlation metrics calculated. While the model generally performs well no matter the initial angle, at no point does a zero initial angle compare best to the data, indicating that a unidirectional model may be missing some of the dynamical features of wave propagation over a muddy shelf. Furthermore, despite similar correlation scores between linear and nonlinear model comparisons of bulk statistics, it is seen the linear model does not replicate some aspects of the spectral evolution (such as low-frequency generation and amplification) shown in the data and captured by the nonlinear model. Despite the relatively short propagation distance, the effects of both directionality and nonlinearity play a noticeable role in wave evolution over a muddy seabed.
机译：研究了波泥相互作用对方向性和非线性的敏感性。一个考虑了定向波传播和泥浆阻尼的相分辨非线性波模型被用来模拟在一个泥泞的架子上的波传播。来自美国路易斯安那州西部中部谢尼尔平原海岸进行的实验的现场数据用于验证模型。最近，利用现场数据对一维波浪模型进行了验证，结果表明该模型能够复制泥泞底部的波谱演变。在这项研究中，单向波谱也通过抛物线模型运行，但是具有不同的初始角度。为了评估非线性演化对结果的影响，还进行了线性波模型运行。将模型中三个不同光谱带中包含的重要波高和总能量与架子上的数据进行比较，并计算相关度量。尽管无论初始角度如何，该模型通常都表现良好，但零初始角度在任何情况下都无法与数据进行最佳比较，这表明单向模型可能缺少在泥泞的架子上传播的某些动力学特征。此外，尽管批量统计的线性模型比较和非线性模型比较之间具有相似的相关评分，但可以看出线性模型并未复制数据中显示并由非线性捕获的频谱演化的某些方面（例如低频生成和放大）模型。尽管传播距离相对较短，但方向性和非线性的影响在泥泞海底的波浪演化中起着显著作用。

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