Three-Dimensional Modeling of Density Current in a Straight Channel

Firoozabadi, Bahar; Afshin, Hossein; Aram, Ehsan

doi:10.1061/(asce)hy.1943-7900.0000026

Cited by 29 publications

(11 citation statements)

References 26 publications

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“…Gu (2009) used a validated two-dimensional (2D) simulation model CE-QUAL-W2 (Cole and Wells 2010) to quantify systematically the effects of inflow and ambient parameters on the behavior of a density-induced contaminant current in various flow regimes in a stratified reservoir through numerical experiments. Several studies about threedimensional (3D) gravity currents were conducted recently using laboratory data and numerical models (Imran et al 2007, Firoozabadi et al 2009, Rueda and MacIntyre 2010, An and Julien 2014. Rueda and MacIntyre (2010) used a 3D free surface hydrodynamic model with fine grid resolution to simulate negatively buoyant density currents on steep bottoms with varying slopes in Toolik Lake, AK.…”

Section: Introductionmentioning

confidence: 99%

Understanding flow dynamics and density currents in a river-reservoir system under upstream reservoir releases

Chen

Fang

Devkota³

2016

Hydrological Sciences Journal

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A three-dimensional flow and temperature model was applied for a 124 km river-reservoir system from Lewis Smith Dam tailrace to Bankhead Lock & Dam, Alabama. The model was calibrated against measured water levels, temperatures, velocities and flow rates from 4 May to 3 September 2011 under small constant release (2.83 m 3 /s) and large intermittent releases (~140 m 3 /s) from an upstream reservoir. Distributions of simulated flow and temperatures and particle tracking at various locations were analyzed which revealed the complex interactions of density currents, dynamic surface waves and solar heating. Flows in the surface and bottom layers moved in both upstream and downstream directions. If there was small constant release only from Smith Dam, simulated bottom temperatures at Cordova were on average 4.8°C higher than temperatures under actual releases. The momentum generated from large releases pushed bottom density currents downstream, but the released water took several days to reach Cordova.

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Section: Introductionmentioning

confidence: 99%

Understanding flow dynamics and density currents in a river-reservoir system under upstream reservoir releases

Chen

Fang

Devkota³

2016

Hydrological Sciences Journal

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“…Kulis and Hodges (2006) carried out a layernumber sensitivity test to numerically simulate density currents of the Corpus Christi Bay in Texas using a sigma-coordinate 3D hydrodynamic model based on RANS equations and while taking into account the Boussinesq approximation and the hydrostatic hypothesis. Applying similar 3D hydrodynamic models, Firoozabadi et al (2009) and Mahgoub et al (2015) simulated density currents and validated their results against some laboratory measurements.…”

mentioning

confidence: 81%

Modeling Nonconfined Density Currents Using 3D Hydrodynamic Models

et al. 2019

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Density currents generated by marine brine discharges, e.g., from desalination plants, can have a negative impact on marine 6 ecosystems. It is therefore important to accurately predict their behavior. Predictions are often made using computational hydrodynamic 7 models, which should be validated using field or laboratory measurements. This paper focuses on the setup and validation of three-8 dimensional (3D) models for estimating the transport and mixing processes that occur in these types of flows. Through a comprehensive 9 sensitivity analysis based on the reproduction of several laboratory-generated density currents, a set of recommendations are made regarding 10 the modeling aspects, including the domain discretization, the treatment of momentum at the density current source, the hydrostatic 11 hypothesis and the selection of turbulence closure models. Finally, the proposed numerical model setup is validated using different exper-12 imental data showing good agreement in terms of the main variables considered: errors of less than 1.3% for dilution and of 6% for velocity. 13 This study serves as a first step toward the full validation of these 3D hydrodynamic models for the simulation of field-scale density currents.

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“…Natale and Vicinanza(2001) studied the effect of wave on the temperature distribution of neighboring seas, by warm water release. For the numerical researches, Paik et al(2009) developed a 3-D model to simulate advection-diffusion of density current, and Firoozabadi et al(2009) and Georgoulas et al(2010) dealt with 3-D advectiondiffusion characteristics of density current through simulations. In addition, White and Helfrich(2008) numerically studied propagation characteristic of density current with wave excitation.…”

Section: Introductionmentioning

confidence: 99%

Behavior Characteristics of Density Currents Due to Salinity Differences in a 2-D Water Tank

Lee

Mizutani

Hur

2018

J. Ocean Eng. Technol.

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In this study, a hydraulic model test, to which Particle Image Velocimetry (PIV) system applied, was used to determine the hydrodynamic characteristics of the advection-diffusion of saltwater according to bottom conditions (impermeable/permeability, diameter, and inclination) and the difference of the initial salt. Considering quantitative and qualitative results from the experiment, the characteristics of the density current were discussed. As an experimental result, the advection-diffusion mechanism of salinity was examined by the shape of saltwater wedge and the flow structure of density currents with various bottom conditions. The vertical salt concentration obtained from the experiment was used as quantitative data to calculate the diffusion coefficient that was used in the numerical model of the advection-diffusion of saltwater.

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Three-Dimensional Modeling of Density Current in a Straight Channel

Cited by 29 publications

References 26 publications

Understanding flow dynamics and density currents in a river-reservoir system under upstream reservoir releases

Understanding flow dynamics and density currents in a river-reservoir system under upstream reservoir releases

Modeling Nonconfined Density Currents Using 3D Hydrodynamic Models

Behavior Characteristics of Density Currents Due to Salinity Differences in a 2-D Water Tank

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