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      3D Modal Solution for Tidally Induced Lagrangian Residual Velocity with Variations in Eddy Viscosity and Bathymetry in a Narrow Model Bay

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          In this study, we examine the results obtained by the Finite-volume Coastal Ocean Circulation Model (FVCOM) regarding the effects of eddy viscosity and bathymetry on the three-dimensional (3D) Lagrangian residual velocity (LRV) in a narrow bay. The results are cast in terms of two nondimensional numbers: the ratio of friction to local acceleration ( δ) and the ratio of the minimum depth over shoals to the maximum depth in the channel ( ε). The ratio δ depends on the eddy viscosity and mean depth. For a given eddy viscosity, when ε > 0.5, the along-estuary LRV tends to be vertically sheared and when ε < 0.5, the exchange is laterally sheared. When ε << 1, the structure of the 3D, depth-integrated, and breadth-averaged LRV changes only slightly as δ increases. For ε values between 0.33 and 0.5, the structure of the 3D LRV is mainly laterally sheared. In the same ε range, the 3D and depth- integrated LRV exhibit reversed structures from high to low δ values. In addition, the breadth-averaged LRV weakens the typical two- layered circulation when δ decreases. When ε is 1, the two-layered vertical structure reverses direction, and a three- layered vertical structure develops in the outer bay as δ decreases.

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          Author and article information

          Journal of Ocean University of China
          Science Press and Springer (China )
          10 January 2019
          01 February 2019
          : 18
          : 1
          : 69-79
          1 Physical Oceanography Laboratory/CIMST, Ocean University of China and Qingdao National Laboratory for Marine Science and Technology, Qingdao 266100, China
          2 Laboratory of Marine, Environment and Ecology, Ocean University of China, Qingdao 266100, China
          3 Department of Civil and Coastal Engineering, University of Florida, Gainesville, FL 32611, USA
          Author notes
          *Corresponding author: JIANG Wensheng
          Copyright © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2019.

          The copyright to this article, including any graphic elements therein (e.g. illustrations, charts, moving images), is hereby assigned for good and valuable consideration to the editorial office of Journal of Ocean University of China, Science Press and Springer effective if and when the article is accepted for publication and to the extent assignable if assignability is restricted for by applicable law or regulations (e.g. for U.S. government or crown employees).

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