Tidally- and wind-driven residual circulation at the multiple-inlet system East Frisian Wadden Sea

Herrling, Gerald

doi:10.1016/j.csr.2015.06.001

Cited by 31 publications

(15 citation statements)

References 49 publications

(65 reference statements)

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“…Journal of Geophysical Research: Oceans, 123, 8460-8488. https://doi.org/10. 1029 in offshore or open ocean waters (e.g., Flores et al, 2017;Horner-Devine et al, 2015), estuaries are semienclosed (Cameron & Pritchard, 1963;Hansen & Rattray, 1965, 1966 and lagoons can be more limited in exchange with the coastal ocean (Kjerfve, 1986;Kjerfve & Magill, 1989) and may even have multiple openings (Duran-Matute et al, 2016;Herrling & Winter, 2015;Jia & Li, 2012;Li, 2013). The constrictions of such system at entrance can act as low-pass filters that diminish tidal influence into the basin (Fernandes et al, 2004) or change the fortnightly tidal phases (Hill, 1994).…”

Section: 1029/2018jc013985mentioning

confidence: 99%

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

Huang

Chen

et al. 2018

JGR Oceans

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Lake Pontchartrain is a brackish estuary and restricted lagoon in the microtidal northern Gulf of Mexico. Using a validated Finite Volume Community Ocean Model (FVCOM), we study the flow regimes and wind‐driven adjustment of circulation in this system. It is found that tidal currents are only significant in the eastern end near the open boundary. Local wind inside the estuary is important in driving the circulation including coastal currents. Numerical experiments confirm that the subtidal wind‐driven flow is in a quasi‐steady balance between wind stress and surface slope. Our results show that the adjustment of surface level inside the system to a sudden change in wind is a transient seiche, which dissipates within two to three cycles, each lasting ~3 hr. After the oscillations, the system reaches a new equilibrium. We show in theory that this is a damped oscillation and as wind changes, an adjustment to a new equilibrium goes much faster than a complete tidal period. This leads to the quasi steady state balance of subtidal wind‐driven flows with essentially no phase lag with wind even though wind changes with time continuously. Wind‐induced circulation behaves differently from the Csanady model with Earth rotation but similar to the prismatic lake model of Engelund without Coriolis: The coastal and shallow regions tend to have flows in the direction of wind, while the interior and deeper waters have return flows against the wind especially in bottom layer. The surface flow may not be in the direction of wind, while the bottom usually has broad and uniform counter wind flows.

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Section: 1029/2018jc013985mentioning

confidence: 99%

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

Huang

Chen

et al. 2018

JGR Oceans

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“…The 95% CI interval is determined from the fit. However, the exact value of K can be affected by the choice of station for the wind time series, and the values of the model parameters (D crit , D min , and the bottom roughness length z 0 [see e.g., Herrling and Winter, 2015]) which influence the computed residual volume transport. Nonetheless, the effect of the choice in wind station is limited due to the small spatial variability of the wind within the region and it does not change Figure 6 qualitatively.…”

Section: The Effect At Each Inlet and The Watershedmentioning

confidence: 99%

“…This quantification is particularly challenging due to the complex geometry of the systems, the different orientation of the inlets, the different amplitudes and phases of the tide at each inlet for every given tidal period, and the variability in the wind, and the freshwater discharge. Simplifications have then been used in previous numerical and semianalytical studies, for example, neglecting smaller inlets or watersheds (also known as tidal divides ) [e.g., Buijsman and Ridderinkhof , ], using vertically averaged simulations neglecting baroclinic effects and freshwater inflows [e.g., Herrling and Winter , ], considering simplified geometries [e.g., Li , ], or modeling a small number of tidal cycles [e.g., Stanev et al ., ]. Observational studies, on the other hand, have shortcomings such as relatively short time span, temporal gaps, or limited spatial coverage [ Gerkema et al ., ; Salles et al ., ; Sassi et al ., ].…”

Section: Introductionmentioning

confidence: 99%

Quantifying the residual volume transport through a multiple-inlet system in response to wind forcing: The case of the western Dutch Wadden Sea

Duran‐Matute

Gerkema

Sassi

2016

J. Geophys. Res. Oceans

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In multiple‐inlet coastal systems like the western Dutch Wadden Sea, the tides (and their interaction with the bathymetry), the fresh water discharge, and the wind drive a residual flow through the system. In the current paper, we study the effect of the wind on the residual volume transport through the inlets and the system as a whole on both the short (one tidal period) and long (seasonal or yearly) time scales. The results are based on realistic three‐dimensional baroclinic numerical simulations for the years 2009–2011. The length of the simulations (over 2000 tidal periods) allowed us to analyze a large variety of conditions and quantify the effect of wind on the residual volume transport. We found that each inlet has an anisotropic response to wind; i.e., the residual volume transport is much more sensitive to the wind from two inherent preferential directions than from any other directions. We quantify the effects of wind on the residual volume transport through the system and introduce the concept of the system's conductance for such wind driven residual transport. For the western Dutch Wadden Sea, the dominant wind direction in the region is close to the direction with the highest conductance and opposes the tidally driven residual volume transport. This translates in a large variability of the residual volume transport and a dominance of the wind in its long‐term characteristics in spite of the episodic nature of storms.

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“…Weather induced hydrodynamic response in estuaries and coastal ocean has been recognized and studied for a long time. Wind can have a considerable effect on hydrodynamics and can be the major contributor to subtidal exchanges between estuaries and the adjacent coastal oceans (Chuang & Swenson, ; Feng & Li, ; Herrling & Winter, ; Sanay & Valle‐Levinson, ; Schoen et al, ). Subtidal motion was found the most important factor in controlling water surface fluctuations; and water level was found highly correlated with wind at a time scale of ∼3 days (Swenson & Chuang, ).…”

Section: Introductionmentioning

confidence: 99%

Cold Front Driven Flows Through Multiple Inlets of Lake Pontchartrain Estuary

Huang

2017

JGR Oceans

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With in situ observations using acoustic Doppler current profilers (ADCPs) and numerical experiments using the Finite Volume Coastal Ocean Model (FVCOM), this study investigates atmospheric cold front induced exchange of water between Lake Pontchartrain Estuary and coastal ocean through multiple inlets. Results show that the subtidal hydrodynamic response is highly correlated with meteorological parameters. Northerly and westerly winds tend to push water out of Lake Pontchartrain, while south and east winds tend to produce currents flowing into it. For most cases, the subtidal water level is inversely correlated with the east wind, with the correlation coefficient being ∼0.8. The most important finding of this work is that, contrary to intuition, the cold front induced remote wind effect has the greatest contribution to the overall water level variation, while the local wind stress determines the surface slope inside the estuary. It is found that wind driven flow is roughly quasi steady state: the surface slope in the north‐south direction is determined by the north‐south wind stress, explaining ∼83% of the variability but less so in the east‐west direction (∼43%). In other words, the north‐south local wind stress determines the water level gradient in that direction in the estuary while the overall water level change is pretty much controlled by the open boundary which is the “remote wind effect,” a regional response that can be illustrated only by a numerical model for a much larger area encompassing the estuary.

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Tidally- and wind-driven residual circulation at the multiple-inlet system East Frisian Wadden Sea

Cited by 31 publications

References 49 publications

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

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

Quantifying the residual volume transport through a multiple-inlet system in response to wind forcing: The case of the western Dutch Wadden Sea

Cold Front Driven Flows Through Multiple Inlets of Lake Pontchartrain Estuary

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