Flow Regimes and Adjustment to Wind‐Driven Motions in Lake Pontchartrain Estuary: A Modeling Experiment Using FVCOM

Li, Chunyan; Huang, Wei; Chen, Changsheng; Lin, Huichan

doi:10.1029/2018jc013985

Cited by 23 publications

(6 citation statements)

References 88 publications

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“…The flow field in shallow water tends to be in the direction of wind but modified by the coastline and depth gradient, while the deeper water tends to have counter wind flows, especially at the bottom. These wind-driven circulations are consistent with previous studies [22][23][24].…”

Section: Numerical Model Experimental Results Using Fvcomsupporting

confidence: 93%

Astronomical Tide and Storm Surge Signals Observed in an Isolated Inland Maar Lake Near the Coast

Xie

et al. 2021

JMSE

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Aimed at the explanation of clear tidal signal and storm surge signals in a closed inland lake near the coast (the Huguangyan Lake), this work uses a combined approach with observations and model experiments. Huguangyan Lake is a closed inland freshwater coneless volcanic crater lake near the coast in tropical southern China, less than 5 km from an estuary. It has a diameter of about 1.5 km and relatively deep water of up to 20 m. Bottom pressure was measured from an acoustic Doppler current profiler (ADCP) for 10 days in September 2018 and 10 days in January 2019. The observations encompass the period of Typhoon Mangkhut, which passed the region when it made its landfall. The time series demonstrate clear tidal and subtidal signals. The tidal signal remains even if we exclude the barometric pressure effect. Interestingly, the lake has no surface connection with the ocean. The astronomical tide has an amplitude of about 2 cm. The major tidal signals include the principal solar semidiurnal (S2) and lunisolar (K1) constituents. During the passage of Typhoon Mangkhut, the water level variability inside the lake increased by an order of magnitude (>0.3 m). To examine whether the lake water level change was due to the natural oscillations inside the lake (or seiche), a numerical wind-driven hydrodynamics model was designed using the 3-D Finite Volume Community Ocean Model (FVCOM). The results show that a small first-order seiche can be generated, but only with a time scale of minutes and with a magnitude much smaller than the observed surface elevation changes. This excludes any measurable seiche and the observed surface elevation change inside the lake cannot be wind-driven. Moreover, tides inside the lake are not generated by tidal potential, as the lake is too small for having a locally generated tide. The main result of our study has therefore excluded the local tidal-generating force, wind-driven seiche, and barometric effect, as possible causes of the lake oscillation which has tidal and subtidal signals. The subtidal variation is at least one order of magnitude greater than tides inside the lake and is caused by weather-induced overall coastal ocean water level oscillations transmitted into the lake through groundwater connection. All these lead to the major conclusion that the lake is connected to the coastal ocean through groundwater.

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Section: Numerical Model Experimental Results Using Fvcomsupporting

confidence: 93%

Astronomical Tide and Storm Surge Signals Observed in an Isolated Inland Maar Lake Near the Coast

Xie

et al. 2021

JMSE

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“…We use the Finite Volume Community Ocean Model (FV-COM) (Chen et al, 2003). FVCOM has been used in numerous studies of coastal and estuarine waters (Lai et al, 2015(Lai et al, , 2016Sun et al, 2016;Li et al, 2018;Chen et al, 2021) and also globally and in the Arctic Ocean (Chen et al, 2016;Zhang et al, 2016). FVCOM uses an unstructured triangular grid in the horizontal and terrain-following σ coordinates in the vertical (Chen et al, 2003).…”

Section: The Modelmentioning

confidence: 99%

Flow separation, dipole formation, and water exchange through tidal straits

Nøst

Børve

2021

Ocean Sci.

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Abstract. We investigate the formation and evolution of dipole vortices and their contribution to water exchange through idealized tidal straits. Self-propagating dipoles are important for transporting and exchanging water properties through straits and inlets in coastal regions. In order to obtain a robust dataset to evaluate flow separation, dipole formation and evolution, and the effect on water exchange, we conduct 164 numerical simulations, varying the width and length of the straits as well as the tidal forcing. We show that dipoles form and start propagating at the time of flow separation, and their vorticity originates in the velocity front formed by the separation. We find that the dipole propagation velocity is proportional to the tidal velocity amplitude and twice as large as the dipole velocity derived for a dipole consisting of two point vortices. We analyze the processes creating a net water exchange through the straits and derive a kinematic model dependent on dimensionless parameters representing strait length, dipole travel distance, and dipole size. The net tracer transport resulting from the kinematic model agrees closely with the numerical simulations and provides an understanding of the processes controlling net water exchange.

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“…We use the Finite Volume Community Ocean Model (FVCOM) (Chen et al, 2003). FVCOM has been used in numerous studies of coastal and estuarine waters (Li et al, 2018;Lai et al, 2015Lai et al, , 2016Sun et al, 2016;Chen et al, 2021) and also globally and in the Arctic Ocean (Chen et al, 2016;Zhang et al, 2016). FVCOM uses an unstructured triangular grid in the horizontal and terrain-following σ-coordinates in the vertical (Chen et al, 2003).…”

Section: The Modelmentioning

confidence: 99%

Flow separation, dipole formation and water exchange through tidal strait

Nøst¹,

Børve²

2021

Preprint

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Abstract. We investigate the formation and evolution of dipole vortices and their contribution to water exchange through idealized tidal straits. Self-propagating dipoles are important for transporting and exchanging water properties through straits and inlets in coastal regions. In order to obtain a robust data-set to evaluate flow separation, dipole formation and evolution and the effect on water exchange, we conduct 164 numerical simulations, varying the width and length of the straits as well as the tidal forcing. We show that dipoles are formed and start propagating at the time of flow separation, and their vorticity originates in the velocity front formed by the separation. We find that the dipole propagation velocity is proportional to the tidal velocity amplitude, and twice as large as the dipole velocity derived for a dipole consisting of two point vortices. We analyse the processes creating a net water exchange through the straits and derive a kinematic model dependent on dimensionless parameters representing strait length, dipole travel distance and dipole size. The net tracer transport resulting from the kinematic model agrees closely with the numerical simulations and provide understanding of the processes controlling net water exchange.

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Flow Regimes and Adjustment to Wind‐Driven Motions in Lake Pontchartrain Estuary: A Modeling Experiment Using FVCOM

Cited by 23 publications

References 88 publications

Astronomical Tide and Storm Surge Signals Observed in an Isolated Inland Maar Lake Near the Coast

Astronomical Tide and Storm Surge Signals Observed in an Isolated Inland Maar Lake Near the Coast

Flow separation, dipole formation, and water exchange through tidal straits

Flow separation, dipole formation and water exchange through tidal strait

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