Three‐Dimensional Modeling of Fine Sediment Transport by Waves and Currents in a Shallow Estuary
Three‐Dimensional Modeling of Fine Sediment Transport by Waves and Currents in a Shallow Estuary
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DOI：
10.1029/2017jc013064
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发表时间：
2018-06
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影响因子：
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通讯作者：
Y. Chou;Kurt S. Nelson;R. Holleman;O. Fringer;M. Stacey;J. Lacy;S. Monismith;J. Koseff
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文献类型：
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作者：
Y. Chou;Kurt S. Nelson;R. Holleman;O. Fringer;M. Stacey;J. Lacy;S. Monismith;J. Koseff
在非结构网格SUNTANS模式中实现了一个悬浮泥沙输运模式，并应用于南旧金山弗朗西斯科湾细颗粒泥沙输运的研究。该模型能够根据潮流和风浪的联合强迫计算底质悬浮。我们表明，准确的结果可以通过采用两个大小的类，这是在海湾中的微观和宏观的arrhocs的代表。本文的一个关键发现是，关键的校准参数是从床层的微观颗粒与宏观颗粒的侵蚀比。浅浅滩和深水道需要不同的侵蚀率值，因为这些区域的沉积动力学性质不同。研究表明，应用空间可变的侵蚀比和侵蚀临界剪应力可以准确地再现位于沿着跨河道横断面的四个现场观测点的悬浮泥沙浓度。结果表明，浅滩和深槽中的悬沙浓度行为形成了鲜明的对比。波浪重新悬浮在浅滩上的沉积物，虽然潮汐和风产生的电流需要混合薄波驱动的悬浮液进入水柱。浅滩输沙对河道含沙量的贡献
A suspended sediment transport model is implemented in the unstructured-grid SUNTANS model and applied to study fine-grained sediment transport in South San Francisco Bay. The model enables calculation of suspension of bottom sediment based on combined forcing of tidal currents and wind waves. We show that accurate results can be obtained by employing two-size classes which are representative of microflocs and macroflocs in the Bay. A key finding of the paper is that the critical calibration parameter is the ratio of the erosion of the microflocs to macroflocs from the bed. Different values of this erosion ratio are needed on the shallow shoals and deeper channels because of the different nature of the sediment dynamics in these regions. Application of a spatially variable erosion ratio and critical shear stress for erosion is shown to accurately reproduce observed suspended sediment concentration at four-field sites located along a cross-channel transect. The results reveal a stark contrast between the behavior of the suspended sediment concentration on the shoals and in the deep channel. Waves are shown to resuspend sediments on the shoals, although tidal and wind-generated currents are needed to mix the thin wave-driven suspensions into the water column. The contribution to the suspended sediment concentration in the channel by transport from the shoals