Solute dispersion in the coastal boundary layer of southern Lake Michigan

Thupaki, Pramod; Phanikumar, Mantha S.; Whitman, Richard L.

doi:10.1002/jgrc.20136

Cited by 14 publications

(15 citation statements)

References 52 publications

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“…waters follow the Okubo 4/3 power-law scaling [Okubo, 1971], mixing rates close to shore are higher due to shear effects resulting from lateral and bottom boundaries [Lawrence et al, 1995;Peeters et al, 1996;Stocker and Imberger, 2003;Ojo et al, 2006;Thupaki et al, 2013]. Based on data from a continuous Rhodamine-WT dye release study conducted during summer 2008, Thupaki et al [2013] estimated a mean horizontal dispersion coefficient of about 5.6 m 2 /s close to the shore in southern Lake Michigan. Dispersion rates in the nearshore can also be calculated using Lagrangian drifters, which have the advantage of higher sampling rate [Spydell et al, 2007;Nekouee, 2010].…”

Section: Results Based On Dye Diffusion Studies In Open Lakes and Ocementioning

confidence: 99%

“…Results based on dye diffusion studies in open lakes and oceans indicate that while mixing rates in open waters follow the Okubo 4/3 power‐law scaling [ Okubo , ], mixing rates close to shore are higher due to shear effects resulting from lateral and bottom boundaries [ Lawrence et al ., ; Peeters et al ., ; Stocker and Imberger , ; Ojo et al ., ; Thupaki et al ., ]. Based on data from a continuous Rhodamine‐WT dye release study conducted during summer 2008, Thupaki et al .…”

Section: Introductionmentioning

confidence: 99%

“…Based on data from a continuous Rhodamine‐WT dye release study conducted during summer 2008, Thupaki et al . [] estimated a mean horizontal dispersion coefficient of about 5.6 m 2 /s close to the shore in southern Lake Michigan. Dispersion rates in the nearshore can also be calculated using Lagrangian drifters, which have the advantage of higher sampling rate [ Spydell et al ., ; Nekouee , ].…”

Section: Introductionmentioning

confidence: 99%

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Summer circulation and exchange in the Saginaw Bay-Lake Huron system

Nguyen

Thupaki

Anderson

et al. 2014

J. Geophys. Res. Oceans

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We use a three-dimensional, unstructured grid hydrodynamic model to examine circulation and exchange in the Saginaw Bay-Lake Huron system during the summer months for three consecutive years (2009)(2010)(2011). The model was tested against ADCP observations of currents, data from a Lagrangian drifter experiment in the Saginaw Bay, and temperature data from the National Data Buoy Center stations. Mean circulation was predominantly cyclonic in the main basin of Lake Huron with current speeds in the surface layer being highest in August. Circulation in the Saginaw Bay was characterized by the presence of an anticyclonic gyre at the mouth of the outer bay and two recirculating cells within the inner bay. New estimates are provided for the mean flushing times (computed as the volume of the bay divided by the rate of inflow) and residence times (computed as e-folding flushing times based on dye concentration modeling treating the bay as a continuously stirred tank reactor) for Saginaw Bay. The average flushing time (over the 3 months of summer and for all 3 years) was 23.0 days for the inner bay and 9.9 days for the entire bay. The mean e-folding flushing time was 62 days (2 months) for the inner bay and 115 days (3.7 months) for the entire bay for the summer conditions examined in this work. To characterize the behavior of river plumes in the inner Saginaw Bay, trajectory data from GPS-enabled Lagrangian drifters were used to compute the absolute diffusivity values in the alongshore and cross-shore directions.

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Section: Results Based On Dye Diffusion Studies In Open Lakes and Ocementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Summer circulation and exchange in the Saginaw Bay-Lake Huron system

Nguyen

Thupaki

Anderson

et al. 2014

J. Geophys. Res. Oceans

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“…Detailed analysis of the model results are presented in the work of Thupaki et al . []. Table provides a summary of the RMSE values for the hydrodynamic model comparisons.…”

Section: Resultsmentioning

confidence: 99%

“…The hydrodynamic, conservative tracer (Rhodamine WT), and thermal transport models were tested earlier and the results were reported in the work of Thupaki et al . []. The GLERL‐Donelan wave model used in our work was described in [ Schwab et al ., ; Liu et al ., ] and has been extensively tested in the Great Lakes and was used to simulate surface waves.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the role of sediment‐bacteria interactions on Escherichia coli concentrations at beaches in southern Lake Michigan

et al. 2013

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[1] Association of bacteria with suspended sediment in the water column complicates the assessment and prediction of nearshore water quality. We examine the impact of sedimentbacteria interactions on Escherichia coli (EC) levels at beaches in southern Lake Michigan using three-dimensional EC fate and transport models with and without explicit descriptions of sediment-bacteria interactions. We simulate hydrodynamics using a nested-grid numerical model and use a semiparametric wave model to compute wave heights and net bottom shear stress. The attachment-detachment dynamics of bacteria in the water column are modeled using a linear partition coefficient. The numerical models were tested against data, collected in summer 2008, which included measurements of EC at three beaches and multiple ADCP deployments for currents and waves. Our results indicate that the model that accounts for sediment-bacteria interactions describes the observed data significantly better and that sediment, directly and indirectly, interacts with bacteria to influence their fate and transport. The improvement results from the model's ability to describe the multiple short-duration, low-intensity resuspension events at our sampling sites. A major resuspension event was noted during the simulation period but the sampling frequency during the event was inadequate to resolve the details of the peak. Using the linear isotherm model to simulate attachment-detachment dynamics of bacteria in the water column, we found that the fraction of bacteria attached to suspended sediment particles in the water column is highly variable in the vertical at offshore locations but nearly constant closer to the shore.

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Predicting larval alewife transport in Lake Michigan using hydrodynamic and Lagrangian particle dispersion models

Rowe

Prendergast

Alofs

et al. 2022

Limnology & Oceanography

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Several species of fish in large lakes and marine environments have a pelagic larval stage, and are subject to variable transport that can ultimately regulate survival and recruitment success. Alewife, Alosa pseudoharengus, are subject to transport by complex coastal currents during their pelagic larval stage (~30 d). We assessed backward-trajectory simulations, consisting of a Lagrangian particle dispersion model linked to the Finite Volume Community Ocean Model, to estimate likely hatch locations of aged larval alewife collected from locations on both the eastern and western sides of Lake Michigan during July 2015. We used four deployments of three satellite-tracked drifter buoys in coastal waters to assess model skill in estimating the origin of a drifter from its final location. We found that the trajectories of drifters varied greatly, depending on wind events and associated coastal transport processes, including upwelling/downwelling and coastal jet currents. In 2 of 12 cases, the backward trajectory simulations failed to predict the drifter origin, associated with transport of 170 km in a narrow coastal jet current. In the remaining 10 cases, the known drifter origin was within 3.5 km of the spatial patch of predicted possible origins for a scenario of horizontal diffusivity (188 m 2 s À1 ) consistent with the offshore model grid resolution. Modeled backward trajectories estimated that alewife originated from the same side of the lake where they were collected, within ~100 km of the collection site. Our paper demonstrates the utility of hydrodynamic models to estimate a region of origin for aged larval fish.

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Solute dispersion in the coastal boundary layer of southern Lake Michigan

Cited by 14 publications

References 52 publications

Summer circulation and exchange in the Saginaw Bay-Lake Huron system

Summer circulation and exchange in the Saginaw Bay-Lake Huron system

Evaluating the role of sediment‐bacteria interactions on Escherichia coli concentrations at beaches in southern Lake Michigan

Predicting larval alewife transport in Lake Michigan using hydrodynamic and Lagrangian particle dispersion models

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