Implementation of viscoelastic mud-induced energy attenuation in the third-generation wave model, SWAN
Implementation of viscoelastic mud-induced energy attenuation in the third-generation wave model, SWAN
复制标题
第三代波浪模型 SWAN 中粘弹性泥浆引起的能量衰减的实现
DOI：
10.1007/s10236-017-1118-4
复制
发表时间：
2017
期刊：
影响因子：
2.3
通讯作者：
S. M. Siadatmousavi
中科院分区：
文献类型：
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作者：
Mostafa Beyramzade;S. M. Siadatmousavi
波浪与流体泥浆的相互作用可以在几个波长内显著耗散波浪能量。在本研究中，提出了第三代波浪模型SWAN，该模型包含了由于与粘弹性流体泥浆层相互作用而引起的波浪能量衰减。针对简单的一维传播情况，用解析解和粘性公式验证了所实现的粘弹性模型的性能。苏里南海岸和阿恰法拉亚陆架的平稳和非平稳测试案例表明，在第三代波浪模型中加入泥波相互作用项提高了模型在实际应用中的性能。在这两种现场情况下，都需要较高的泥浆粘度值（约为0.1 m2/s）来弥补模型在波谱高频范围内的高估。频率相关泥浆粘度值的使用改善了模型的性能，特别是在波谱中0.2 ~ 0.35 Hz的频率范围内。此外，泥波相互作用可能影响频谱的高频部分，这部分频谱也受到风向波的能量传递的影响，即使在10 km量级的获取长度上也是如此。结果表明，在这种情况下，排除风输入项可能会导致反演过程中泥层参数的取值不同。与波-泥相互作用的粘性模型不同，粘弹性模型的反建模结果是一组性能相同的泥浆参数。它提供了一个选择与现场测量更一致的实际泥浆参数的机会。
The interaction of waves with fluid mud can dissipate the wave energy significantly over few wavelengths. In this study, the third-generation wave model, SWAN, was advanced to include attenuation of wave energy due to interaction with a viscoelastic fluid mud layer. The performances of implemented viscoelastic models were verified against an analytical solution and viscous formulations for simple one-dimensional propagation cases. Stationary and non-stationary test cases in the Surinam coast and the Atchafalaya Shelf showed that the inclusion of the mud-wave interaction term in the third-generation wave model enhances the model performance in real applications. A high value of mud viscosity (of the order of 0.1 m2/s) was required in both field cases to remedy model overestimation at high frequency ranges of the wave spectrum. The use of frequency-dependent mud viscosity value improved the performance of model, especially in the frequency range of 0.2–0.35 Hz in the wave spectrum. In addition, the mud-wave interaction might affect the high frequency part of the spectrum, and this part of the wave spectrum is also affected by energy transfer from wind to waves, even for the fetch lengths of the order of 10 km. It is shown that exclusion of the wind input term in such cases might result in different values for parameters of mud layer when inverse modeling procedure was employed. Unlike viscous models for wave-mud interaction, the inverse modeling results to a set of mud parameters with the same performance when the viscoelastic model is used. It provides an opportunity to select realistic mud parameters which are in more agreement with in situ measurements.
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