Modeling Turbulent Transport in Stratified Estuary

Bloss, Siegfried; Lehfeldt, Rainer; Patterson, John C.

doi:10.1061/(asce)0733-9429(1988)114:9(1115)

Cited by 31 publications

(4 citation statements)

References 19 publications

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“…Martin and McCutcheon (1999) show that in estuaries, the transport and history of turbulence can be very important and simple mixing length models may not perform well. Even so, these authors report that in some cases, mixing length models indeed perform adequately (Bloss et al, 1988).…”

Section: • Mixing Length Modelsmentioning

confidence: 98%

Numerical Hydrodynamic and Transport Models for Reservoirs

Wells¹,

Manson²,

Martin³

2007

Energy Production and Reservoir Water Quality

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Hydrodynamics and mass transport are fundamental to the study of water quality in all waterbodies. Besides the complex chemistry, physics and biology of the water quality constituent under consideration, the transport as a result of the carrier fluid is an integral part of temperature and water quality analyses. The distribution of temperature and water quality constituents within a water body can be modeled only to the detail with which the time varying flow field is known. In modern studies of water quality, it is increasingly common to include the application of hydrodynamic models as an integral component of the model application. The hydrodynamic models are then used to "drive" models of water quality, providing information used to predict the movement of water quality constituents through the constituent transport equation.The hydrodynamic equations are based upon conservation of water mass and momentum. The water quality transport equations are based upon conservation of constituent mass and heat. An additional equation of state is used to relate the water density to salinity, temperature, and suspended solids that can affect momentum transfer. Typical assumptions of the flow field are related to the dimensionality of the system in space (one, two or three-dimensions), whether the flow field is dynamic or steady-state, and the 4-1 Energy Production and Reservoir Water Quality Downloaded from ascelibrary.org by New York University on 02/03/15.

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Section: • Mixing Length Modelsmentioning

confidence: 98%

Numerical Hydrodynamic and Transport Models for Reservoirs

Wells¹,

Manson²,

Martin³

2007

Energy Production and Reservoir Water Quality

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“…Determination of turbulent eddy viscosities have been based on multiple approaches: (1) eddy viscosity models as a function of water stability [13][14][15][16], (2) Mixing length models [17,18], (3) One equation models for turbulent kinetic energy [19], (4) Two-equation k-ε models for turbulent kinetic energy and dissipation [11] and (5) Reynolds stress and algebraic stress models [11]. In many models, once the turbulent eddy viscosity is known, then the turbulent diffusion coefficients are computed from E $ μ turbulent ρ where the approximation is based on typical Sc or Pr numbers.…”

Section: Solution Of Governing Equationsmentioning

confidence: 99%

Modeling Thermal Stratification Effects in Lakes and Reservoirs

Wells¹

2021

Inland Waters - Dynamics and Ecology

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A brief overview of characteristics of stratified water bodies is followed by an in-depth analysis of the governing equations for modeling hydrodynamics and water quality. Equations are presented for continuity or the fluid mass balance; x-momentum, y-momentum, and z-momentum equations; mass constituent balance equation; the heat balance equation for temperature; and the equation of state (relating density to temperature and concentration of dissolved and suspended solids). Additional equations and simplifications such as the water surface equation and changes to the pressure gradient term are shown. Many of the assumptions that are made in water quality models are discussed and shown. Typical water quality source-sink terms for temperature, dissolved oxygen, algae, and nutrients are listed. A summary of some typical water quality models for lakes and reservoirs is shown. Two case studies showing how models can predict temperature and dissolved oxygen dynamics in stratified reservoirs are shown. The brief summary looks at ways to improve water quality and hydrodynamic models of lakes and reservoirs.

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“…It simulates physical processes controlling Bay-wide circulation and mixing, such as tides, wind, temperature and density effects, freshwater inflows, turbulence, and the effect of the earth's rotation. The vertical diffusivity is computed by a turbulent kinetic energy (t-k-ε) closure model [26,27]. Details of the solution scheme are provided by Johnson et al [19].…”

Section: Conflicts Of Interestmentioning

confidence: 99%

Influence of Wind Strength and Duration on Relative Hypoxia Reductions by Opposite Wind Directions in an Estuary with an Asymmetric Channel

Wang

Wang²,

Linker

et al. 2016

JMSE

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Computer model experiments are applied to analyze hypoxia reductions for opposing wind directions under various speeds and durations in the north-south oriented, two-layer-circulated Chesapeake estuary. Wind's role in destratification is the main mechanism in short-term reduction of hypoxia. Hypoxia can also be reduced by wind-enhanced estuarine circulation associated with winds that have down-estuary straining components that promote bottom-returned oxygen-rich seawater intrusion. The up-bay-ward along-channel component of straining by the southerly or easterly wind induces greater destratification than the down-bay-ward straining by the opposite wind direction, i.e., northerly or westerly winds. While under the modulation of the west-skewed asymmetric cross-channel bathymetry in the Bay's hypoxic zone, the westward cross-channel straining by easterly or northerly winds causes greater destratification than its opposite wind direction. The wind-induced cross-channel circulation can be completed much more rapidly than the wind-induced along-channel circulation, and the former is usually more effective than the latter in destratification and hypoxia reduction in an early wind period. The relative importance of cross-channel versus along-channel circulation for a particular wind direction can change with wind speed and duration. The existence of month-long prevailing unidirectional winds in the Chesapeake is explored, and the relative hypoxia reductions among different prevailing directions are analyzed. Scenarios of wind with intermittent calm or reversing directions on an hourly scale are also simulated and compared.

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Modeling Turbulent Transport in Stratified Estuary

Cited by 31 publications

References 19 publications

Numerical Hydrodynamic and Transport Models for Reservoirs

Numerical Hydrodynamic and Transport Models for Reservoirs

Modeling Thermal Stratification Effects in Lakes and Reservoirs

Influence of Wind Strength and Duration on Relative Hypoxia Reductions by Opposite Wind Directions in an Estuary with an Asymmetric Channel

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