+publisher:"Texas A&M University" +contributor:("Hetland, Robert D.")

Texas A&M University

1. Ma, Xiaohui. A Study of Frontal-Scale Air-Sea Interaction in Midlatitude Western Boundary Current Regimes.

Degree: PhD, Oceanography, 2014, Texas A&M University

URL: http://hdl.handle.net/1969.1/153332

► Frontal-scale air-sea interactions during boreal winter season in midlatitude western boundary current (WBC) regimes, including the Kuroshio Extension Region (KER) and Gulf Stream Region (GSR),… (more)

▼ Frontal-scale air-sea interactions during boreal winter season in midlatitude western boundary current (WBC) regimes, including the Kuroshio Extension Region (KER) and Gulf Stream Region (GSR), are investigated using both observational (reanalysis) data and regional climate model simulations. The focus of the study is on the KER in the North Pacific. Extreme flux events associated with cold air outbreaks (CAOs) in boreal winter in the KER of the Northwestern Pacific and the GSR of the Northwestern Atlantic are analyzed and compared based on different reanalysis datasets. A close relationship between extreme flux events over the KER/GSR and the Pacific Decadal Oscillation (PDO)/East Atlantic Pattern (EAP) is found with more frequent occurrence of extreme flux events during a positive PDO/EAP phase. Furthermore, the PDO/EAP may be explained as the rectified effects of the synoptic winter storms accompanied with the extreme flux events. A lag-composite analysis shows that event-day storms tend to have a preferred southeastward propagation path, potentially contributing to the southward shift of the storm track over the eastern North Pacific/Atlantic basin during positive PDO/EAP phase. Using an atmosphere-only model (Weather Research Forecasting, WRF) at 27 km, two ensembles of simulations were conducted for boreal winter season in the North Pacific to study the possible local and remote influence of meso-scale oceanic eddies in the KER on the atmosphere. Filtering out meso-scale oceanic eddies results in a deep tropospheric response along and downstream of the KER, including a significant decrease (increase) in winter season mean rainfall along the KER (west coast of US), a reduction of storm growth rate in the KER, and a southward shift of the jet stream and North Pacific storm track in the eastern North Pacific. A mechanism invoking moist baroclinic instability is proposed to link meso-scale oceanic eddies in the KER to largescale atmospheric circulations and weather patterns in the North Pacific. Using a high-resolution (9 km) coupled regional climate model (CRCM), three sets of experiment were performed to investigate potential feedbacks of ocean-eddy induced atmospheric response to the ocean. Filtering out meso-scale oceanic eddies during coupling causes a surface warming and a weak Kuroshio strength. Advisors/Committee Members: Chang, Ping (advisor), Lin, Xiaopei (committee member), Saravanan, R. (committee member), Hetland, Robert D. (committee member).

Subjects/Keywords: Frontal-Scale; Meso-Scale; Air-Sea Interaction; Kuroshio Extension; Gulf Stream; Storm Track; Extreme Flux Event; Eddy

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APA (6^th Edition):

Ma, X. (2014). A Study of Frontal-Scale Air-Sea Interaction in Midlatitude Western Boundary Current Regimes. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/153332

Chicago Manual of Style (16^th Edition):

Ma, Xiaohui. “A Study of Frontal-Scale Air-Sea Interaction in Midlatitude Western Boundary Current Regimes.” 2014. Doctoral Dissertation, Texas A&M University. Accessed January 18, 2021. http://hdl.handle.net/1969.1/153332.

MLA Handbook (7^th Edition):

Ma, Xiaohui. “A Study of Frontal-Scale Air-Sea Interaction in Midlatitude Western Boundary Current Regimes.” 2014. Web. 18 Jan 2021.

Vancouver:

Ma X. A Study of Frontal-Scale Air-Sea Interaction in Midlatitude Western Boundary Current Regimes. [Internet] [Doctoral dissertation]. Texas A&M University; 2014. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/1969.1/153332.

Council of Science Editors:

Ma X. A Study of Frontal-Scale Air-Sea Interaction in Midlatitude Western Boundary Current Regimes. [Doctoral Dissertation]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/153332

Texas A&M University

2. Ardani, Samira. A Model for Transformation of Fully Dispersive Nonlinear Waves.

Degree: PhD, Civil Engineering, 2016, Texas A&M University

URL: http://hdl.handle.net/1969.1/157890

► In this dissertation, we evaluate the performance of nonlinear models, and the eﬀects of bound waves in nearshore wave models are studied mathematically and numerically.… (more)

▼ In this dissertation, we evaluate the performance of nonlinear models, and the eﬀects of bound waves in nearshore wave models are studied mathematically and numerically. The ﬁrst part of this study concerns the evaluation of diﬀerent nearshore models and their capability in the estimation of wave spectra and higher order wave statistics. Four diﬀerent nearshore wave models (three fully dispersive models and a consistent shoaling model) are compared to ﬁeld and experimental data sets. Comparison of these nearshore models reveals that the nearshore models’ performance in predicting higher frequency energy evolution is not as skillful as at lower frequencies. Therefore, a new wave transformation model is derived. The model includes nonlinear wave interaction eﬀects up to third order in wave steepness and is based on the fully dispersive second order model. Transforming the problem into the frequency domain and using multiple scale analysis in space and perturbation theory, the model is expanded up to third order in wave steepness. The result is a set of evolution equations which explicitly contains quadratic near-resonant interactions, non-resonant bound waves, and cubic resonant interactions. The results of the numerical modeling for the aforementioned nearshore model show that the model is veriﬁed reasonably well in terms of the harmonics tests and the spectral analysis for experimental and ﬁeld data sets. However, the calculation of higher order statistical parameters is quite sensitive to how the free parameters in the model are chosen. In addition, the dissipation characteristics of the breaking waves has been investigated using the high-resolution laboratory datasets. The free parameter in a probabilistic breaking model and the threshold parameter in the instantaneous dissipation model is parameterized at each gauge location separately, and the dependency of the calculated damping coeﬃcient in the formulation to frequency components is extensively discussed. Moreover, the relationship between the third moments of free surface elevation and the parameterized threshold parameter in the instantaneous dissipation model is represented. Advisors/Committee Members: Kaihatu, James M (advisor), Socolofsky, Scott A (committee member), Zhang, Jun (committee member), Hetland, Robert D (committee member).

Subjects/Keywords: Nonlinear Waves; Fully Dispersive Waves

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APA (6^th Edition):

Ardani, S. (2016). A Model for Transformation of Fully Dispersive Nonlinear Waves. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/157890

Chicago Manual of Style (16^th Edition):

Ardani, Samira. “A Model for Transformation of Fully Dispersive Nonlinear Waves.” 2016. Doctoral Dissertation, Texas A&M University. Accessed January 18, 2021. http://hdl.handle.net/1969.1/157890.

MLA Handbook (7^th Edition):

Ardani, Samira. “A Model for Transformation of Fully Dispersive Nonlinear Waves.” 2016. Web. 18 Jan 2021.

Vancouver:

Ardani S. A Model for Transformation of Fully Dispersive Nonlinear Waves. [Internet] [Doctoral dissertation]. Texas A&M University; 2016. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/1969.1/157890.

Council of Science Editors:

Ardani S. A Model for Transformation of Fully Dispersive Nonlinear Waves. [Doctoral Dissertation]. Texas A&M University; 2016. Available from: http://hdl.handle.net/1969.1/157890

Texas A&M University

3. Li, Bo. Stratification Limited Vertical Ventilation: Effects of Water-column Stabilities on the Formation of Hypoxia on the Texas-Louisiana Shelf.

Degree: PhD, Oceanography, 2013, Texas A&M University

URL: http://hdl.handle.net/1969.1/151781

► I examine the vertical structure of water-column stability and its relationship to near-bottom dissolved oxygen (DO) concentration in the hypoxic zone of the Texas-Louisiana Shelf… (more)

▼ I examine the vertical structure of water-column stability and its relationship to near-bottom dissolved oxygen (DO) concentration in the hypoxic zone of the Texas-Louisiana Shelf using observations collected between year 2003 and 2009. A threshold of N=0.06 s^(-1) is defined to represent the lower limit of the stratification strength for existence of hypoxia. An idealized one-dimensional model with parameterized respiration was applied to study stratification structure associated hypoxia development. The simulation results showed that the bottom mixed layer could enhance the bottom DO depletion and favor the development of hypoxia. A secondary pycnocline was above the bottom mixed layer and performed as a barrier to inhibit the vertical extension of hypoxia and vertical DO flux through it. Furthermore, I discussed possible mechanisms causing bottom mixed layer on the continental shelf, including return flow caused by upwelling, inertial motions and tidal currents. Diapycnal diffusivity was calculated using hourly continuous observations in the hypoxic zone on the Texas-Louisiana Shelf. The estimated time-averaged diapycnal diffusivity was 3 × 10^(-6) m^(2) s^(-1) along the pycnocline. Averaged cross-pycnocline vertical dissolved oxygen flux was calculated in a two-layer stratified water column with subpycnocline hypoxia. The estimated cross-pycnocline dissolved oxygen flux was 156.8 ml l^(-1) d^(-1), which resupplied 45% dissolved oxygen consumption in the subpycnocline layer. Continuous observations at the South Marsh Mooring showed the first highly resolved observations of short timescale fluctuations in the DO concentrations in the seasonal hypoxic waters on the Louisiana Shelf. There were 19 ventilation events in the DO records with a time period of 1~3 days. Analysis of the time series of DO, salinity and temperature at different levels of the mooring demonstrated that most of the ventilation-intervals were associated with increased vertical mixing, which contributed 58% of the total ventilation intervals. It suggests that mixing events dominate the ventilation-intervals. Comparison of the time derivative of the low-frequency part of the near-bottom DO concentration to observations of the wind and significant wave height suggests that local wind events are responsible for the enhanced vertical mixing. Advisors/Committee Members: DiMarco, Steven F. (advisor), Hetland, Robert D. (committee member), Jackson, George A. (committee member), Lin, Xiaopei (committee member), Quigg, Antonietta S. (committee member).

Subjects/Keywords: hypoxia; stratification

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APA (6^th Edition):

Li, B. (2013). Stratification Limited Vertical Ventilation: Effects of Water-column Stabilities on the Formation of Hypoxia on the Texas-Louisiana Shelf. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/151781

Chicago Manual of Style (16^th Edition):

Li, Bo. “Stratification Limited Vertical Ventilation: Effects of Water-column Stabilities on the Formation of Hypoxia on the Texas-Louisiana Shelf.” 2013. Doctoral Dissertation, Texas A&M University. Accessed January 18, 2021. http://hdl.handle.net/1969.1/151781.

MLA Handbook (7^th Edition):

Li, Bo. “Stratification Limited Vertical Ventilation: Effects of Water-column Stabilities on the Formation of Hypoxia on the Texas-Louisiana Shelf.” 2013. Web. 18 Jan 2021.

Vancouver:

Li B. Stratification Limited Vertical Ventilation: Effects of Water-column Stabilities on the Formation of Hypoxia on the Texas-Louisiana Shelf. [Internet] [Doctoral dissertation]. Texas A&M University; 2013. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/1969.1/151781.

Council of Science Editors:

Li B. Stratification Limited Vertical Ventilation: Effects of Water-column Stabilities on the Formation of Hypoxia on the Texas-Louisiana Shelf. [Doctoral Dissertation]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/151781

Texas A&M University

4. Herrera, Michael Aaron. An Investigation of the Dynamics of Forecast Errors and Its Representation in the THORPEX Interactive Grand Global Ensemble (TIGGE).

Degree: MS, Atmospheric Sciences, 2014, Texas A&M University

URL: http://hdl.handle.net/1969.1/154177

► We employ local linear diagnostics to investigate the efficiency of an ensemble in capturing the space and magnitude of forecast uncertainties. In this study, we… (more)

Subjects/Keywords: TIGGE; Forecast Error; NWP

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APA (6^th Edition):

Herrera, M. A. (2014). An Investigation of the Dynamics of Forecast Errors and Its Representation in the THORPEX Interactive Grand Global Ensemble (TIGGE). (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/154177

Chicago Manual of Style (16^th Edition):

Herrera, Michael Aaron. “An Investigation of the Dynamics of Forecast Errors and Its Representation in the THORPEX Interactive Grand Global Ensemble (TIGGE).” 2014. Masters Thesis, Texas A&M University. Accessed January 18, 2021. http://hdl.handle.net/1969.1/154177.

MLA Handbook (7^th Edition):

Herrera, Michael Aaron. “An Investigation of the Dynamics of Forecast Errors and Its Representation in the THORPEX Interactive Grand Global Ensemble (TIGGE).” 2014. Web. 18 Jan 2021.

Vancouver:

Herrera MA. An Investigation of the Dynamics of Forecast Errors and Its Representation in the THORPEX Interactive Grand Global Ensemble (TIGGE). [Internet] [Masters thesis]. Texas A&M University; 2014. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/1969.1/154177.

Council of Science Editors:

Herrera MA. An Investigation of the Dynamics of Forecast Errors and Its Representation in the THORPEX Interactive Grand Global Ensemble (TIGGE). [Masters Thesis]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/154177

Texas A&M University

5. Zhang, Wenxia. Stratification Prediction and Bottom Boundary Layer Dynamics over the Texas-Louisiana Continental Shelf.

Degree: PhD, Oceanography, 2015, Texas A&M University

URL: http://hdl.handle.net/1969.1/155027

► The bottom boundary layer is an unstratified thin layer above the sea floor, separated from the more strongly stratified interior. Formation of a thin bottom… (more)

▼ The bottom boundary layer is an unstratified thin layer above the sea floor, separated from the more strongly stratified interior. Formation of a thin bottom boundary layer in the presence of stratification and a sloping bottom is common, and well characterized by theory. This thin layer is an important source of mixing over the continental shelf, and it plays a fundamental role in several continental shelf physical and biogeochemical processes, such as buoyancy advection, bottom material transport and hypoxia formation. In this research, Both observations and numerical models are used to study models' ability of reproducing observed stratification and bottom boundary layer dynamics over the Texas-Louisiana shelf. Simulated vertical stratification, which is also representing the vertical density structure, was first evaluated since it directly controls the bottom boundary layer structure itself and is important for other bottom boundary layer dynamics. A new metric, the histogram of vertical stratification, is introduced in this research to evaluate the models' ability of reproducing observed stratification in a bulk sense. The improvement in model performance is attributed to the finer horizontal and temporal resolutions of a model, while factors like open boundary conditions and vertical resolutions are modified without any improvement in the ability of the model to simulate observed stratification. Towed, undulating CTD profiles collected during Mechanisms Controlling Hypoxia (MCH) program also detected mid-water oxygen minima in many transects. These intrusions are connected with the bottom boundary layer and follows the pycnocline seaward as a mid-water column tongue of low oxygen. We calculate convergence within the bottom boundary layer relative to density surfaces using the simulated results; there is a convergence in the bottom boundary layer at the location where the pycnocline intercepts the bottom, creating an injection of bottom boundary layer water into the pycnocline. Convergent flow at the bottom, relative to isopycnal surfaces, is strongest in the density classes associated with the oxygen minimum layer. We believe these mid-water oxygen minima are actually intrusions of low oxygen protruding from the bottom boundary layer via buoyancy advection driven convergence, following the main pycnocline. Advisors/Committee Members: Hetland, Robert D. (advisor), Lin, Xiaopei (advisor), DiMarco, Steven F. (committee member), Socolofsky, Scott A. (committee member).

Subjects/Keywords: stratification; bottom boundary layer

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APA (6^th Edition):

Zhang, W. (2015). Stratification Prediction and Bottom Boundary Layer Dynamics over the Texas-Louisiana Continental Shelf. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/155027

Chicago Manual of Style (16^th Edition):

Zhang, Wenxia. “Stratification Prediction and Bottom Boundary Layer Dynamics over the Texas-Louisiana Continental Shelf.” 2015. Doctoral Dissertation, Texas A&M University. Accessed January 18, 2021. http://hdl.handle.net/1969.1/155027.

MLA Handbook (7^th Edition):

Zhang, Wenxia. “Stratification Prediction and Bottom Boundary Layer Dynamics over the Texas-Louisiana Continental Shelf.” 2015. Web. 18 Jan 2021.

Vancouver:

Zhang W. Stratification Prediction and Bottom Boundary Layer Dynamics over the Texas-Louisiana Continental Shelf. [Internet] [Doctoral dissertation]. Texas A&M University; 2015. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/1969.1/155027.

Council of Science Editors:

Zhang W. Stratification Prediction and Bottom Boundary Layer Dynamics over the Texas-Louisiana Continental Shelf. [Doctoral Dissertation]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/155027

6. Jiang, Boyang. Multi-Dimensional Error Analysis of Nearshore Wave Modeling Tools, with Application Toward Data-Driven Boundary Correction.

Degree: MS, Ocean Engineering, 2012, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8790

► As the forecasting models become more sophisticated in their physics and possible depictions of the nearshore hydrodynamics, they also become increasingly sensitive to errors in… (more)

Subjects/Keywords: Modeling; Sensitivity; Delft3D; Empirical Orthogonal Function Analysis

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APA (6^th Edition):

Jiang, B. (2012). Multi-Dimensional Error Analysis of Nearshore Wave Modeling Tools, with Application Toward Data-Driven Boundary Correction. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8790

Chicago Manual of Style (16^th Edition):

Jiang, Boyang. “Multi-Dimensional Error Analysis of Nearshore Wave Modeling Tools, with Application Toward Data-Driven Boundary Correction.” 2012. Masters Thesis, Texas A&M University. Accessed January 18, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8790.

MLA Handbook (7^th Edition):

Jiang, Boyang. “Multi-Dimensional Error Analysis of Nearshore Wave Modeling Tools, with Application Toward Data-Driven Boundary Correction.” 2012. Web. 18 Jan 2021.

Vancouver:

Jiang B. Multi-Dimensional Error Analysis of Nearshore Wave Modeling Tools, with Application Toward Data-Driven Boundary Correction. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8790.

Council of Science Editors:

Jiang B. Multi-Dimensional Error Analysis of Nearshore Wave Modeling Tools, with Application Toward Data-Driven Boundary Correction. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8790

7. Zhang, Zhaoru. Wind- and Buoyancy-modulated Along-shore Circulation over the Texas-Louisiana Shelf.

Degree: PhD, Oceanography, 2013, Texas A&M University

URL: http://hdl.handle.net/1969.1/151180

► Numerical experiments are used to study the wind- and buoyancy-modulated along-shore circulation over the Texas-Louisiana continental shelf inshore of 50-m water depth. Most attention is… (more)

▼ Numerical experiments are used to study the wind- and buoyancy-modulated along-shore circulation over the Texas-Louisiana continental shelf inshore of 50-m water depth. Most attention is given to circulation in the non-summer flow regime. A major focus of this study is on a unique along-shore flow phenomenon – convergent along- shore flows, which is controlled jointly by wind forcing and buoyancy fluxes from the Mississippi-Atchafalaya river plume. The second problem addresses the forcing effect of buoyancy on the general along-shore circulation pattern over the shelf in non-summer. The convergent along-shore flows are characterized by down-coast flow from the northern shelf encountering up-coast flow from the southern shelf. This phenomenon is explored for both weather band and seasonal timescales. For the weather band, investigations are focused on non-summer convergent events. The formation of convergent flows is primarily caused by along-coast variation in the along-shore component of wind forcing, which in turn is due to the curvature of the Texas-Louisiana coastline. In general, along-shore currents are well correlated with along-shore winds. However, the points of convergence of currents and winds are not co-located; but rather, points of convergence of currents typically occur down-coast of points of convergence of wind. This offset is mainly caused by buoyancy forcing that forces down-coast currents and drives the point of convergence of currents further down-coast. No specific temporal shift pattern is found for the weather-band convergence, whereas monthly monthly mean convergence exhibits a prominent pattern of seasonal along-coast migration. Buoyancy forcing in the non-summer along-shore flow is investigated in detail in the second part of this study. During non-summer, under down-coast wind forcing, the Mississippi-Atchafalaya river plume exhibits a bottom-advected pattern, for which isopycnals strongly interact with the sea floor. The density front is fairly wide and spans nearly across the entire shelf. Within the front, vertical shear of the alongshore flow is in thermal wind balance with the cross-shore density gradient, and the shear causes a slight reversal of alongshore flow near the bottom. An alongshore flow estimated by the thermal wind relation, along with an assumption of zero bottom reference velocity, agrees well with the actual alongshore flow. Advisors/Committee Members: Hetland, Robert D. (advisor), Lin, Xiaopei (advisor), Chang, Ping (committee member), Stossel, Achim (committee member), Szunyogh, Istvan (committee member).

Subjects/Keywords: Texas-Louisiana shelf; alongshore circulation; wind; buoyancy

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APA (6^th Edition):

Zhang, Z. (2013). Wind- and Buoyancy-modulated Along-shore Circulation over the Texas-Louisiana Shelf. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/151180

Chicago Manual of Style (16^th Edition):

Zhang, Zhaoru. “Wind- and Buoyancy-modulated Along-shore Circulation over the Texas-Louisiana Shelf.” 2013. Doctoral Dissertation, Texas A&M University. Accessed January 18, 2021. http://hdl.handle.net/1969.1/151180.

MLA Handbook (7^th Edition):

Zhang, Zhaoru. “Wind- and Buoyancy-modulated Along-shore Circulation over the Texas-Louisiana Shelf.” 2013. Web. 18 Jan 2021.

Vancouver:

Zhang Z. Wind- and Buoyancy-modulated Along-shore Circulation over the Texas-Louisiana Shelf. [Internet] [Doctoral dissertation]. Texas A&M University; 2013. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/1969.1/151180.

Council of Science Editors:

Zhang Z. Wind- and Buoyancy-modulated Along-shore Circulation over the Texas-Louisiana Shelf. [Doctoral Dissertation]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/151180

8. Kim, Dae Hong. Turbulent Flow and Transport Modeling by Long Waves and Currents.

Degree: PhD, Civil Engineering, 2010, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-6979

► This dissertation presents models for turbulent flow and transport by currents and long waves in large domain. From the Navier-Stokes equations, a fully nonlinear depth-integrated… (more)

▼ This dissertation presents models for turbulent flow and transport by currents and long waves in large domain. From the Navier-Stokes equations, a fully nonlinear depth-integrated equation model for weakly dispersive, turbulent and rotational flow is derived by a perturbation approach based on long wave scaling. The same perturbation approach is applied for the derivation of a depth-integrated transport equation. As the results, coherent structures generated by the turbulence induced by the bottom friction and topography can be predicted very reasonably. The three dimensional turbulence effects are incorporated into the flow model by employing a back scatter model. The back scatter model makes it possible to predict turbulent transport: It contributes to the energy transport and the lateral turbulent diffusion through relying on the turbulent intensity, not by relying on an empirical diffusion constant. The inherent limitation of the depth-integrated transport equation, that is, the limitation for the near field prediction is recognized in the derivation and the numerical simulation. To solve the derived equation set, a highly accurate and stable finite volume scheme numerical solver is developed. Thus, the numerical solver can predict dispersive and nonlinear wave propagation with minimal error. Also, good stability is achieved enough to be applied to the dam-break flows and undular tidal bores. In addition, a robust moving boundary scheme based on simple physical conditions is presented, which can extend the applicability area of the depth-integrated models. By the comparison study with experimental data, it is expected that the numerical model can provide high confidence results for the wave and current transformations including shocks and undular bores on complex bathymetry and topography. For the accurate near field transport prediction, a three dimensional transport model in ?-coordinate coupled with the depth-integrated flow model is developed. Like the other models, this model is also intended for large domain problems, and yet efficient and accurate in the far field and near field together. Advisors/Committee Members: LYNETT, PATRICK J. (advisor), HETLAND, ROBERT D. (committee member), SOCOLOFSKY, SCOTT A. (committee member), IRISH, JENNIFER L. (committee member).

Subjects/Keywords: Boussinesq equations; turbulent transport; modeling; finite volume method

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APA (6^th Edition):

Kim, D. H. (2010). Turbulent Flow and Transport Modeling by Long Waves and Currents. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-6979

Chicago Manual of Style (16^th Edition):

Kim, Dae Hong. “Turbulent Flow and Transport Modeling by Long Waves and Currents.” 2010. Doctoral Dissertation, Texas A&M University. Accessed January 18, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-6979.

MLA Handbook (7^th Edition):

Kim, Dae Hong. “Turbulent Flow and Transport Modeling by Long Waves and Currents.” 2010. Web. 18 Jan 2021.

Vancouver:

Kim DH. Turbulent Flow and Transport Modeling by Long Waves and Currents. [Internet] [Doctoral dissertation]. Texas A&M University; 2010. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-6979.

Council of Science Editors:

Kim DH. Turbulent Flow and Transport Modeling by Long Waves and Currents. [Doctoral Dissertation]. Texas A&M University; 2010. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-6979

9. Zhang, Xiaoqian. WIND-DRIVEN NEAR INERTIAL OCEAN RESPONSE AND MIXING AT THE CRITICAL LATITUDE.

Degree: PhD, Oceanography, 2010, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-493

► The spatial structure and temporal evolution of sea breeze and the latitudinal distribution of propagation and mixing of sea breeze driven near-inertial ocean response in… (more)

▼ The spatial structure and temporal evolution of sea breeze and the latitudinal distribution of propagation and mixing of sea breeze driven near-inertial ocean response in the Gulf of Mexico are investigated using comprehensive data sets and a non-linear numerical model. Near 30�N, inertial oceanic response is significantly enhanced by a near-resonant condition between inertial and diurnal forcing frequencies. Observational results indicate that sea breeze variability peaks in summer and extends at least 300 km offshore with continuous seaward phase propagation. The maximum near-inertial oceanic response occurs in June when there is a shallow mixed layer, strong stratification, and an approximately 10-day period of continuous sea breeze forcing. Near-inertial current variance decreases in July and August due to the deepening of the mixed layer and a more variable phase relationship between the wind and current. River discharge varies interannually and can significantly alter the oceanic response during summer. During 1993, the ?great flood? of the Mississippi River deepens the summer mixed layer and reduces the sea breeze response. The near-inertial currents can provide considerable vertical mixing on the shelf in summer, as seen by the suppression of bulk Richardson number during strong near-inertial events. Three-dimensional idealized simulations show that the coastal oceanic response to sea breeze is trapped poleward of 30� latitude, however, it can propagate offshore as Poincare waves equatorward of 30� latitude. Near 30� latitude, the maximum oceanic response to sea breeze moves offshore slowly because of the near-zero group speed of Poincare waves at this latitude. The lateral energy flux convergence plus the energy input from the wind is maximum near the critical latitude, leading to increased vertical mixing. This local dissipation is greatly reduced at other latitudes. Simulations with realistic bathymetry of the Gulf of Mexico confirm that a basin-wide ocean response to coastal sea breeze forcing is established in the form of Poincare waves. This enhanced vertical mixing is consistent with observations on the Texas-Louisiana Shelf. Comparison of the three-dimensional and one-dimensional models shows some significant limitations of one-dimensional simplified models for sea breeze simulations near the critical latitude. Advisors/Committee Members: DiMarco, Steven F. (advisor), Hetland, Robert D. (committee member), Smith, David C. (committee member), Jochens, Ann E. (committee member), Epifanio, Craig C. (committee member).

Subjects/Keywords: sea breeze; near-inertial motions; resonance; Poincare waves; mixing; Gulf of Mexico

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APA (6^th Edition):

Zhang, X. (2010). WIND-DRIVEN NEAR INERTIAL OCEAN RESPONSE AND MIXING AT THE CRITICAL LATITUDE. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-493

Chicago Manual of Style (16^th Edition):

Zhang, Xiaoqian. “WIND-DRIVEN NEAR INERTIAL OCEAN RESPONSE AND MIXING AT THE CRITICAL LATITUDE.” 2010. Doctoral Dissertation, Texas A&M University. Accessed January 18, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-493.

MLA Handbook (7^th Edition):

Zhang, Xiaoqian. “WIND-DRIVEN NEAR INERTIAL OCEAN RESPONSE AND MIXING AT THE CRITICAL LATITUDE.” 2010. Web. 18 Jan 2021.

Vancouver:

Zhang X. WIND-DRIVEN NEAR INERTIAL OCEAN RESPONSE AND MIXING AT THE CRITICAL LATITUDE. [Internet] [Doctoral dissertation]. Texas A&M University; 2010. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-493.

Council of Science Editors:

Zhang X. WIND-DRIVEN NEAR INERTIAL OCEAN RESPONSE AND MIXING AT THE CRITICAL LATITUDE. [Doctoral Dissertation]. Texas A&M University; 2010. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-493

Texas A&M University

10. Baek, Seong-Ho. Penetration of buoyancy driven current due to a wind forced river plume.

Degree: PhD, Oceanography, 2009, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-1174

► The long term response of a plume associated with freshwater penetration into ambient, ocean water under upwelling favorable winds is studied using the Regional Ocean… (more)

Subjects/Keywords: penetration; plume

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APA (6^th Edition):

Baek, S. (2009). Penetration of buoyancy driven current due to a wind forced river plume. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1174

Chicago Manual of Style (16^th Edition):

Baek, Seong-Ho. “Penetration of buoyancy driven current due to a wind forced river plume.” 2009. Doctoral Dissertation, Texas A&M University. Accessed January 18, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-1174.

MLA Handbook (7^th Edition):

Baek, Seong-Ho. “Penetration of buoyancy driven current due to a wind forced river plume.” 2009. Web. 18 Jan 2021.

Vancouver:

Baek S. Penetration of buoyancy driven current due to a wind forced river plume. [Internet] [Doctoral dissertation]. Texas A&M University; 2009. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1174.

Council of Science Editors:

Baek S. Penetration of buoyancy driven current due to a wind forced river plume. [Doctoral Dissertation]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1174

Texas A&M University

11. Sitanggang, Khairil Irfan. Boussinesq-equation and rans hybrid wave model.

Degree: PhD, Ocean Engineering, 2009, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2795

► This dissertation presents the development of a novel hybrid wave model, comprised of the irrotational, 1-D horizontal Boussinesq and 2-D vertical turbulence-closed Reynolds Averaged Navier-Stokes… (more)

▼ This dissertation presents the development of a novel hybrid wave model, comprised of the irrotational, 1-D horizontal Boussinesq and 2-D vertical turbulence-closed Reynolds Averaged Navier-Stokes (RANS) wave models. The two constituents are two-way coupled with the interface placed at a location where turbulence is relatively small. Boundary conditions on the interfacing side of each model is provided by its counterpart model through data exchange, requiring certain transformation due to the difference in physical variables employed in both models. The model is intended for large-scale wave simulation, accurate in both the nonbreaking and breaking zones with relatively coarser grid in the former and finer in latter, and yet efficient. Hybrid model tests against idealized solitary and standing wave motions and wave-overtopping on structure exhibit satisfactory to very good agreement. Compared with pure RANS simulations, the hybrid model saves computational time by a factor proportional to the reduction in the size of the RANS domain. Also, a large-scale tsunami simulation is provided for a numerical setup that is practically unapproachable using RANS alone; not only does the hybrid model offer more rapid simulation of relatively small-scale problems, it provides an opportunity to examine very large total domains with the fine resolution typical of RANS simulations. To allow for implementation on even larger domain with affordable CPU time, the hybrid model is parallelized to run on distributed memory machine. This is done by parallelizing the RANS model while leaving the Boussinesq model serial. One of the processors is responsible for both the sub-RANS and Boussinesq calculations. ICCG(0) for solving the pressure equation is parallelized using the nonoverlappingdecomposition technique, requiring more iterations than the serial one. Standing wave and hypothetical tsunami simulations with 960×66 and 1000×100 grids, and using 8 processors confirm model validity and computational efficiency of 82% and 65%. Finally, the 2-D Boussinesq model is parallelized using domain decomposition technique. The solution to the tridiagonal system arising in the model is calculated as the sum of the homogeneous and particular solutions. Parallel model tests using up to 32 processors exhibit model accuracy and efficiency of 80% for simulation with 500×500–2000×2000 grids. Advisors/Committee Members: Lynett, Patrick J (advisor), Edge, Billy L (committee member), Hetland, Robert D (committee member), Sarin, Vivek (committee member).

Subjects/Keywords: hybrid; coupling; boussinesq; rans

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APA (6^th Edition):

Sitanggang, K. I. (2009). Boussinesq-equation and rans hybrid wave model. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2795

Chicago Manual of Style (16^th Edition):

Sitanggang, Khairil Irfan. “Boussinesq-equation and rans hybrid wave model.” 2009. Doctoral Dissertation, Texas A&M University. Accessed January 18, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2795.

MLA Handbook (7^th Edition):

Sitanggang, Khairil Irfan. “Boussinesq-equation and rans hybrid wave model.” 2009. Web. 18 Jan 2021.

Vancouver:

Sitanggang KI. Boussinesq-equation and rans hybrid wave model. [Internet] [Doctoral dissertation]. Texas A&M University; 2009. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2795.

Council of Science Editors:

Sitanggang KI. Boussinesq-equation and rans hybrid wave model. [Doctoral Dissertation]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2795

Texas A&M University

12. Kiselkova, Valeriya. Effect of instabilities in the buoyancy-driven flow on the bottom oxygen: Applications to the Louisiana Shelf.

Degree: PhD, Oceanography, 2009, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2797

► A combination of in situ sampling and numerical modeling was used to investigate the effects of mesoscale (<50 km) circulation patterns and stratification on the… (more)

▼ A combination of in situ sampling and numerical modeling was used to investigate the effects of mesoscale (<50 km) circulation patterns and stratification on the evolution of hypoxia on the Louisiana Shelf. Temperature, salinity, and dissolved oxygen concentrations records reveal the presence of an alongshelf meander, which is manifested vertically and horizontally as a wave-like distribution of the properties in the water column. The observations suggest the meander is a ubiquitous characteristic of the shelf with alongshore spatial scale approximately 50 km and less, which is consistent with the locations of sandy shoals along the coast and the local deformation radius. Twelve numerical experiments using an idealized three-dimensional shelf circulation model were performed to evaluate the relative importance of the variable bottom topography and freshwater forcing on the development, evolution, and scales of the dynamic instabilities. The inclusion of the shoals into the bottom topography showed the development of the dynamic instabilities as the flow passed over the shoals and downstream. Introduction of fresh water onto the shelf resulted in greater salinity differences, and, as a consequence in the formation of the dynamically unstable salinity fronts along the plume edge. The combination of the freshwater forcing and shoaling topography produced competing and complex interactions. Six numerical experiments were analyzed in order to investigate the effect of dynamic instabilities on spatial and temporal patterns of dissolved oxygen concentrations along the shelf. Although a linear relationship between Brunt-Väisälä frequency and dissolved oxygen deficit was expected, a nonlinear loop-like relationship was discovered that reflects the response of biochemical properties to the alongshelf variability of the density field. Comparison of the numerical modeling runs to observations of density and dissolved oxygen concentrations on the Louisiana Shelf reinforces the importance of physical processes such as topographic steering and/or freshwater forcing on the alongshore distribution of physical and biochemical properties. It suggests that the time scales of respiration (~3 days) and buoyancy transfer processes (~5-7 days), associated with the physical processes that are responsible for water column stability and ventilation, are similar to the time scales associated with the benthic respiration rates. Advisors/Committee Members: DiMarco, Steven F. (advisor), Brooks, David (committee member), Edge, Billy L. (committee member), Hetland, Robert D. (committee member).

Subjects/Keywords: Dynamic instability; Hypoxia; Louisiana Shelf; Stratification; Numerical Modeling; Gulf of Mexico

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APA (6^th Edition):

Kiselkova, V. (2009). Effect of instabilities in the buoyancy-driven flow on the bottom oxygen: Applications to the Louisiana Shelf. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2797

Chicago Manual of Style (16^th Edition):

Kiselkova, Valeriya. “Effect of instabilities in the buoyancy-driven flow on the bottom oxygen: Applications to the Louisiana Shelf.” 2009. Doctoral Dissertation, Texas A&M University. Accessed January 18, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2797.

MLA Handbook (7^th Edition):

Kiselkova, Valeriya. “Effect of instabilities in the buoyancy-driven flow on the bottom oxygen: Applications to the Louisiana Shelf.” 2009. Web. 18 Jan 2021.

Vancouver:

Kiselkova V. Effect of instabilities in the buoyancy-driven flow on the bottom oxygen: Applications to the Louisiana Shelf. [Internet] [Doctoral dissertation]. Texas A&M University; 2009. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2797.

Council of Science Editors:

Kiselkova V. Effect of instabilities in the buoyancy-driven flow on the bottom oxygen: Applications to the Louisiana Shelf. [Doctoral Dissertation]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2797

Texas A&M University

13. Francis, Simone. Flow-topography interactions, particle transport and plankton dynamics at the Flower Garden Banks: a modeling study.

Degree: PhD, Oceanography, 2006, Texas A&M University

URL: http://hdl.handle.net/1969.1/3236

► Flow disruption resulting from interactions between currents and abrupt topography can have important consequences for biological processes in the ocean. A highresolution three-dimensional hydrodynamic model… (more)

▼ Flow disruption resulting from interactions between currents and abrupt topography can have important consequences for biological processes in the ocean. A highresolution three-dimensional hydrodynamic model is used to study topographically influenced flow at the Flower Garden Banks, two small but thriving coral reef ecosystems in the northwest Gulf of Mexico. Flow past the modeled banks is characterized by vortex shedding, turbulent wake formation and strong return velocities in the near-wake regions. The speed of the oncoming current, strength of water-column stratification, and level of topographic detail used in the model each serve to modulate these basic flow characteristics. Larval retention and dispersal processes at the Flower Garden Banks, and specifically the dependence of these processes on the nature of flow disruption, are explored by coupling a Lagrangian particle-tracking algorithm to the hydrodynamic model. Passive particles released from the tops of the modeled banks as mimics of coral larvae can remain trapped in the wake regions very close to the banks on time scales of hours to days, depending primarily on the speed of the free-stream current. Most particles are swept quickly downstream, however, where their trajectories are most strongly influenced by the topography of the continental shelf. Modeled dispersal patterns suggest that there is an ample supply of larvae from the Flower Garden Banks to nearby oil and gas platforms, which can provide suitable benthic habitat for corals. The flow disturbances generated by the modeled banks result in the mixing of nutrients from deeper water into shallower, nutrient-depleted layers in the wakes of the banks. The ability of the planktonic system to respond to such an injection of nutrients is tested by embedding a simple nutrient-phytoplankton-zooplankton ecosystem model into the hydrodynamic model. Plankton biomass in the flow-disturbed wakes is shown to increase in response to the additional nutrients. This study shows how flow-topography interactions at the Flower Garden Banks can exert critical control over local larval transport processes and plankton dynamics. More generally, it demonstrates the usefulness and feasibility of using numerical models as tools to uncover important mechanisms of physical-biological interaction in the ocean. Advisors/Committee Members: Jackson, George A. (advisor), Hetland, Robert D. (committee member), Neill, William H. (committee member), Pinckney, James L. (committee member).

Subjects/Keywords: ocean modeling; larval transport; plankton dynamics; Flower Garden Banks

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APA (6^th Edition):

Francis, S. (2006). Flow-topography interactions, particle transport and plankton dynamics at the Flower Garden Banks: a modeling study. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/3236

Chicago Manual of Style (16^th Edition):

Francis, Simone. “Flow-topography interactions, particle transport and plankton dynamics at the Flower Garden Banks: a modeling study.” 2006. Doctoral Dissertation, Texas A&M University. Accessed January 18, 2021. http://hdl.handle.net/1969.1/3236.

MLA Handbook (7^th Edition):

Francis, Simone. “Flow-topography interactions, particle transport and plankton dynamics at the Flower Garden Banks: a modeling study.” 2006. Web. 18 Jan 2021.

Vancouver:

Francis S. Flow-topography interactions, particle transport and plankton dynamics at the Flower Garden Banks: a modeling study. [Internet] [Doctoral dissertation]. Texas A&M University; 2006. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/1969.1/3236.

Council of Science Editors:

Francis S. Flow-topography interactions, particle transport and plankton dynamics at the Flower Garden Banks: a modeling study. [Doctoral Dissertation]. Texas A&M University; 2006. Available from: http://hdl.handle.net/1969.1/3236

Texas A&M University

14. Lahiry, Sudeshna. Relationships between nutrients and dissolved oxygen concentrations on the Texas-Louisiana shelf during summer of 2004.

Degree: MS, Oceanography, 2009, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-1950

► Hypoxia (dissolved oxygen concentrations less than 1.4 ml/l) is a recurrent seasonal phenomenon on the Louisiana Shelf, caused by the combined effects of nutrient loading… (more)

▼ Hypoxia (dissolved oxygen concentrations less than 1.4 ml/l) is a recurrent seasonal phenomenon on the Louisiana Shelf, caused by the combined effects of nutrient loading by the Mississippi and Atchafalaya River System (MARS), and density stratification. In 2004, three shelf wide cruises (in April, June and August) were conducted on the Louisiana Shelf to understand the mechanisms controlling hypoxia on the shelf, and examine the relationship between dissolved oxygen and nutrient concentrations during the hypoxic periods. The shelf was divided into three geographically separate zones: A (off the mouth of the Mississippi River), B (off the Terrebonne Bay) and C (off the mouth of the Atchafalaya). Each zone was different in terms of the physical and biochemical processes occurring there. In April, no hypoxia was observed on the shelf because of water column mixing by winds, even though high discharge occurred from the MARS. Nutrients were abundant in the surface waters but present only in little amounts at the bottom. In June, the water column was highly stratified. Because of the presence of upwelling favorable winds no vertical mixing occurred and caused extensive hypoxia on the shelf. Dissolved oxygen concentrations were negatively correlated with nutrients at the bottom of the water column. Nutrients were considerably higher at the bottom than at the surface (except for zone A, where high nutrients were seen even at the bottom), indicating remineralization below the pycnocline. Resuspension of organic material and remineralized nitrogen were sustaining hypoxia far from the river sources. In August, hypoxia was patchy on the Louisiana Shelf. Correlations between dissolved oxygen and nutrient concentration varied seasonally with highest correlations occurring during hypoxic conditions in June and August. The spatial distribution of nutrients and other oceanographic parameters, such as light transmission, fluorescence, and dissolved oxygen concentrations, indicate seasonal variability of biochemical processes that are related to physical processes that affect stratification. Advisors/Committee Members: DiMarco, Steven F. (advisor), Hetland, Robert D. (advisor), Epifanio, Craig C. (committee member), Jochens, Ann E. (committee member).

Subjects/Keywords: hypoxia; Texas-Louisiana Shelf; Gulf of Mexico

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lahiry, S. (2009). Relationships between nutrients and dissolved oxygen concentrations on the Texas-Louisiana shelf during summer of 2004. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1950

Chicago Manual of Style (16^th Edition):

Lahiry, Sudeshna. “Relationships between nutrients and dissolved oxygen concentrations on the Texas-Louisiana shelf during summer of 2004.” 2009. Masters Thesis, Texas A&M University. Accessed January 18, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-1950.

MLA Handbook (7^th Edition):

Lahiry, Sudeshna. “Relationships between nutrients and dissolved oxygen concentrations on the Texas-Louisiana shelf during summer of 2004.” 2009. Web. 18 Jan 2021.

Vancouver:

Lahiry S. Relationships between nutrients and dissolved oxygen concentrations on the Texas-Louisiana shelf during summer of 2004. [Internet] [Masters thesis]. Texas A&M University; 2009. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1950.

Council of Science Editors:

Lahiry S. Relationships between nutrients and dissolved oxygen concentrations on the Texas-Louisiana shelf during summer of 2004. [Masters Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1950

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