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

作     者：DENG Fangjing JIANG Wensheng VALLE-LEVINSON Arnoldo FENG Shizuo 

作者机构：Physical Oceanography Laboratory/CIMST Ocean University of China and Qingdao National Laboratory for Marine Science and Technology Laboratory of Marine Environment and Ecology Ocean University of China Department of Civil and Coastal Engineering University of Florida 

出 版 物：《Journal of Ocean University of China》 (中国海洋大学学报（英文版）)

年 卷 期：2019年第18卷第1期

页      面：69-79页

核心收录：

学科分类：07[理学] 

基　　金：supported by the National Natural Science Foundation of China (No. 41676003) the National Natural Science Foundation of China–Shandong Joint Fund for Marine Science Research Centers (No.U1606402) 

主　　题：eddy viscosity bathymetric effects Lagrangian residual velocity 3D narrow bay 

摘      要：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(3 D) 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 3 D, 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 3 D LRV is mainly laterally sheared. In the same ε range, the 3 D and depth-integrated LRV exhibit reversed structures from high to low δ values. In addition, the breadth-averaged LRV weakens the typical twolayered 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.