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Implementation of viscoelastic mud-induced energy attenuation in the third-generation wave model, SWAN

机译：在第三代波浪模型SWAN中实现粘弹性泥浆诱导的能量衰减

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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 m(2)/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.
机译：波与流体泥浆的相互作用可以在很少的波长范围内显着耗散波能。在这项研究中，改进了第三代波浪模型SWAN，以包括由于与粘弹性流体泥浆层相互作用而引起的波能衰减。针对简单的一维传播情况，针对解析解和粘性公式验证了已实施的粘弹性模型的性能。 Surinam海岸和Atchafalaya Shelf的固定和非固定测试案例表明，在第三代波浪模型中包含泥波相互作用项可以提高模型在实际应用中的性能。在两种现场情况下都需要较高的泥浆粘度值（约为0.1 m（2）/ s），以弥补在高频谱范围内对模型的高估。使用与频率有关的泥浆粘度值改善了模型的性能，尤其是在波谱的0.2-0.35 Hz频率范围内。此外，泥波相互作用可能会影响频谱的高频部分，而这部分频谱也会受到从风到波的能量转移的影响，即使在获取长度约为10 km的情况下也是如此。结果表明，在这种情况下，当采用逆向建模程序时，排除风输入项可能会导致不同的泥浆层参数值。与用于波浪-泥浆相互作用的粘性模型不同，当使用粘弹性模型时，逆模型会生成一组具有相同性能的泥浆参数。它提供了一个选择实际泥浆参数的机会，这些参数与现场测量结果更加吻合。

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