3D numerical computation of the tidally induced Lagrangian residual current in an idealized bay

Cui, Yanxing; Jiang, Wensheng; Deng, Fangjing

doi:10.1007/s10236-018-01243-1

Cited by 10 publications

(2 citation statements)

References 30 publications

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“…Subsequently, numerical models were utilized to study the contribution of tidal body force to LRV under a constant eddy viscosity, revealing that the Stokes' drift component plays a dominant role (Cui et al, 2019). Chen et al (2020) analyzed the contribution of each dynamical term to the LRV and found the Stokes' drift component is the dominant component under the condition of the horizontal unvaried but depth-varying eddy viscosity.…”

Section: Introductionmentioning

confidence: 99%

Influence of Stratification and Wind Forcing on the Dynamics of Lagrangian Residual Velocity in a Periodically Stratified Estuary

Deng,

Jia,

Shi

et al. 2023

Preprint

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Abstract. Wind and stratification play pivotal roles in shaping the structure of the Lagrangian residual velocity (LRV). However, the intricate dynamics by which wind and stratification modify the LRV remain poorly studied. This study derives numerical solutions of LRV components and eddy viscosity subcomponents to elucidate the dynamics within the periodically stratified Pearl River estuary. The vertical shear cross-estuary LRV (uL) is principally governed by the interplay among the eddy viscosity component (uLtu), the barotropic component (uLba), and the baroclinic component (uLgr) under stratified conditions. During neap tides, southwesterly winds notably impact uL by escalating uLtu by an order of magnitude within the upper layer. This transforms the eastward flow dominated by uLtu under wind influence into a westward flow dominated by uLba in upper shoal regions without wind forcing. The along-estuary LRV exhibits a gravitational circulation characterized by upper-layer outflow engendered by barotropic component (vLba) and lower-layer inflow predominantly driven by baroclinic component (vLgr). The presence of southwesterly winds suppresses along-estuary gravitational circulation by diminishing the magnitude of vLba and vLgr. The contributions of vLba and vLgr are approximately equal, while the ratio between uLba and uLgr (uLtu) fluctuates within the range of 1 to 2 in stratified waters. Under unstratified conditions, LRV exhibits a lateral shear structure due to differing dominant components compared to stratified conditions. In stratified scenarios, the eddy viscosity component of LRV is predominantly governed by the turbulent mean component, while it succumbs to the influence of the tidal straining component in unstratified waters.

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Section: Introductionmentioning

confidence: 99%

Influence of Stratification and Wind Forcing on the Dynamics of Lagrangian Residual Velocity in a Periodically Stratified Estuary

Deng,

Jia,

Shi

et al. 2023

Preprint

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“…Although floats like Argo can change their gravity to dive, they do not have the function of following the current effectively and their depth control is not precise, so they cannot be used as drifter for three-dimensional observation. It's the lack of observation techniques including underwater depth control of the drifter that hinders the application of three-dimensional Lagrangian observation and scientists' further studying of the ocean [12], [13], [14].…”

Section: Introductionmentioning

confidence: 99%

Complementary Constrained Model Predictive Depth Control of a Hybridly-Actuated Submarine Drifter

Song

Hou

et al. 2020

IEEE Access

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The submarine drifter is a novel Lagrangian-based observation platform to explore the ocean, but its precise and rapid depth control system design is still an open issue. The major challenge would be the complex hybrid actuation system, which contains anisotropic characteristics and switching issues. In this paper, we proposed an modified complementary constrained model predictive control (MCC-MPC) scheme to meet the metrics. The scheme reformulates complex drifter and hybrid actuation system dynamics into a solvable system with complementary constraints. The nonlinear component inside the system is approximated by applying a sgn-sigmoid approximation function for the sake of linearization and computation. Then the customized online optimizer predicts the system dynamics with complementary constraints and computes the optimal control outputs in the finite horizon in an iterative loop. The validation results prove that the proposed controller can effectively control the submarine drifter to achieve the desired depth and the key metrics are 10x, 4x, and 2x better than conventional PID control, disturbance observerbased control, and conventional MPC methods, respectively.

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Analytical solution to the 3D tide-induced Lagrangian residual current in a narrow bay with vertically varying eddy viscosity coefficient

et al. 2020

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3D numerical computation of the tidally induced Lagrangian residual current in an idealized bay

Cited by 10 publications

References 30 publications

Influence of Stratification and Wind Forcing on the Dynamics of Lagrangian Residual Velocity in a Periodically Stratified Estuary

Influence of Stratification and Wind Forcing on the Dynamics of Lagrangian Residual Velocity in a Periodically Stratified Estuary

Complementary Constrained Model Predictive Depth Control of a Hybridly-Actuated Submarine Drifter

Analytical solution to the 3D tide-induced Lagrangian residual current in a narrow bay with vertically varying eddy viscosity coefficient

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