气候变化领域集成服务门户(CCPortal): Estimation of Bottom Friction Coefficient in Multi-Constituent Tidal Models Using the Adjoint Method: Temporal Variations and Spatial Distributions

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DOI	10.1029/2020JC016949
	Estimation of Bottom Friction Coefficient in Multi-Constituent Tidal Models Using the Adjoint Method: Temporal Variations and Spatial Distributions
	Wang D.; Zhang J.; Wang Y.P.
发表日期	2021
ISSN	21699275
卷号	126 期号:5
英文摘要	The bottom friction coefficient (BFC) is critical for precisely determining hydrodynamic conditions and sediment transport rates, which are important for scientific research and coastal ocean engineering. The BFC varies spatially and temporally, as indicated by in situ observations, but it is difficult to accurately set this parameter in tidal models. In this study, based on a two-dimensional multi-constituent tidal model and its adjoint model, the harmonic constants of four principal tidal constituents (M2, S2, K1, and O1) obtained from TOPEX/Poseidon altimeter data were assimilated to estimate spatially and temporally varying BFCs using the adjoint method in the Bohai, Yellow, and East China Seas. The model performance was significantly improved after data assimilation, which was independently tested by harmonic constants at coastal tidal gauge stations. Through several sensitivity experiments, the spatial distributions of the temporally averaged BFCs were verified to be robust and not affected by model settings, while the temporal variations of the spatially averaged BFCs were also robust but related to the tidal constituents. The variations in the estimated BFCs with the current speed and water depth were nearly consistent with those in the observations. Overall, the temporal and spatial variations in the estimated BFCs are significantly correlated with the current speed and water depth, which is attributed to the erosion-deposition of sediment on the seabed and the changes in seabed roughness under different current speeds. The results can be beneficial for determining reasonable parameters for the bottom stress and setting the BFC in multi-constituent tidal models. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	adjoint method; bottom friction coefficient; data assimilation; ocean tide; parameter estimation
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186308
作者单位	Hubei Key Laboratory of Marine Geological Resources / College of Marine Science and Technology, China University of Geosciences, Wuhan, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, China; Shenzhen Research Institute, China University of Geosciences, Shenzhen, China; Institute of Physical Oceanography and Remote Sensing, Ocean College, Zhejiang University, Zhoushan, China; State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, China
推荐引用方式 GB/T 7714	Wang D.,Zhang J.,Wang Y.P.. Estimation of Bottom Friction Coefficient in Multi-Constituent Tidal Models Using the Adjoint Method: Temporal Variations and Spatial Distributions[J],2021,126(5).
APA	Wang D.,Zhang J.,&Wang Y.P..(2021).Estimation of Bottom Friction Coefficient in Multi-Constituent Tidal Models Using the Adjoint Method: Temporal Variations and Spatial Distributions.Journal of Geophysical Research: Oceans,126(5).
MLA	Wang D.,et al."Estimation of Bottom Friction Coefficient in Multi-Constituent Tidal Models Using the Adjoint Method: Temporal Variations and Spatial Distributions".Journal of Geophysical Research: Oceans 126.5(2021).