globalchange  > 气候减缓与适应
DOI: 10.1029/2017JC013064
Scopus记录号: 2-s2.0-85051119817
论文题名:
Three-Dimensional Modeling of Fine Sediment Transport by Waves and Currents in a Shallow Estuary
作者: Chou Y.-J.; Nelson K.S.; Holleman R.C.; Fringer O.B.; Stacey M.T.; Lacy J.R.; Monismith S.G.; Koseff J.R.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期:6
起始页码: 4177
结束页码: 4199
语种: 英语
英文关键词: estuary ; sediment transport ; tidal currents ; waves
英文摘要: 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 is similar in magnitude to that due to local resuspension. However, the local contribution is in phase with strong bottom currents which resuspend the sediments, while the contribution from the shoals peaks during low-water slack tide. © 2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113788
Appears in Collections:气候减缓与适应

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作者单位: Institute of Applied Mechanics, National Taiwan University, Taipei, Taiwan; Taida Institute of Mathematical Science, National Taiwan University, Taipei, Taiwan; Ocean Technology Research Center, National Taiwan University, Taipei, Taiwan; Bob and Norma Street Environmental Fluid Mechanics Laboratory, Department of Civil and Environmental Engineering, Stanford University, Stanford, CA, United States; San Francisco Estuary Institute, Richmond, CA, United States; Department of Civil and Environmental Engineering, University of California Berkeley, Berkeley, CA, United States; Pacific Coastal and Marine Science Center, U.S. Geological Survey, Santa Cruz, CA, United States

Recommended Citation:
Chou Y.-J.,Nelson K.S.,Holleman R.C.,et al. Three-Dimensional Modeling of Fine Sediment Transport by Waves and Currents in a Shallow Estuary[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(6)
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