Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 54 for “"depth-averaged"”.
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Modelling bottom stress in depth-averaged flows
The relationship between depth-averaged velocity and bottom stress for wind-driven flow in unstratified coastal waters is examined here. The adequacy of traditional linear and quadratic drag laws is addressed by comparison with a 2 1/2-D model. A 2 1/2-D model is one in which a simplified 1-D …
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Modelling bottom stress in depth-averaged flows
The relationship between depth-averaged velocity and bottom stress for wind-driven flow in unstratified coastal waters is examined here. The adequacy of traditional linear and quadratic drag laws is addressed by comparison with a 2 1/2-D model. A 2 1/2-D model is one in which a simplified 1-D …
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A coupled depth-averaged and three-dimensional numerical model for flow-like landslides interacting with obstacles
L'abstract è presente nell'allegato / the abstract is in the attachment
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Approximating three-dimensional fluid flow in a microfluidic device with a two-dimensional, depth-averaged lattice Boltzmann method
… acting on the fluid for the case of constant depth throughout the MFD. This work generalizes the approximation to cases of variable depth to account for the possibility of precipitate or biofilm formation along those surfaces omitted by the 2D simulation. The 2D lattice Boltzmann method (LBM) …
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Simulation of suspended sediment and contaminant transport in shallow water using two-dimensional depth-averaged model with unstructured meshes
With growing global populations and human activities, the problems of sediment transport and environmental hydraulics have been becoming more and more important and valued. Computational fluid dynamics is a very useful and powerful tool in those studies. In 2008, Dr. Liu developed a two-dimensional …
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Numerical analysis of subcritical open channel flow by the penalty function finite element method
… can be accurately analyzed by utilizing the depth-averaged equations of motion. A consequence of adopting this depth-averaged modeling approach is that closure approximations must be implemented to represent the so-called effective stresses. These effective stresses consist of the …
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Understanding longitudinal ADCP measurements to determine water velocities for open channel flow
… traditional standard of practice relies on time-averaged stationary measurements and transect measurements (performed for cross sections roughly perpendicular to the flow) to describe complex hydraulic processes. This research seeks to understand a longitudinal acoustic Doppler current profiler …
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Tidal dynamics and dispersion around coastal headlands
… comparable to or less than the tidal excursion. Depth-averaged shallow water equations forced by oscillatory flow are solved numerically for Gaussian headlands. The tidal flows around these headlands are shown to be characterized by flow separation and. transient eddy formation. Idealized models …
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Modeling Spatial Variability of Field-Scale Solute Transport in the Vadose Zone
… predict the central tendency and distribution of depth-averaged soil water content and total pesticide mass observed in the field on most sampling dates. But their predictions were sufficiently accurate for most management-type applications. Soil hydraulic and retention properties derived from …
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Nonlinear ion transport at high electric currents in shock electrodialysis and ion-intercalation memories
… observed in experiments. In this thesis, a depth-averaged model is developed for shock ED. Compared with previous homogenized models, the depth-averaged model includes the effect of pore-scale ion distribution by integration in the pore cross-sections. The model applies to multicomponent …
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Solute Transport and Biodegradation Characteristics for Models of Enhanced Subsurface Bioremediation
… initial and input solute concentrations, and the depth-averaged groundwater flow velocity and retardation factor of the substrate. The microbial kinetic parameters, initial biomass concentration, dispersion parameters, and the spatial variation of the flow velocity and the retardation factor do …
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Stratification on the Skagit Bay tidal flats
… tidal flats. Advection of stratification by the depth-averaged velocity, straining of the horizontal density gradient by velocity shear, and turbulent mixing are shown to be the dominant processes. On the south-central flats (near the south fork river mouth) velocities are roughly rectilinear, …
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Modelling of simple prismatic channels with varying roughness using the SKM and a study of flows in smooth non-prismatic channels with skewed floodplains
… predicting the lateral distributions of depth-averaged velocity and boundary shear stress for both roughness types. Furthermore, the percentage shear force on the wall of a channel is accurately obtained for both roughness types and guidance is given as to the choice of the three …
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Stratification on the Skagit Bay tidal flats
… tidal flats. Advection of stratification by the depth-averaged velocity, straining of the horizontal density gradient by velocity shear, and turbulent mixing are shown to be the dominant processes. On the south-central flats (near the south fork river mouth) velocities are roughly rectilinear, …
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Chaos in Pulsed Laminar Flow
… plates is modeled as Hele-Shaw flow with the depth averaged velocity proportional to the gradient of the pressure. So, with the depth-averaged velocity, the flow between the parallel plates can effectively be modeled as two-dimensional potential flow. This thesis discusses pulsed source-sink …
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Channel Morphology and Riparian Vegetation Influences on Fluvial Aquatic Habitat
… temperature. Moving beyond one-dimensional (1D) averaged representations of fish habitat, this research explored the distribution of two-dimensional (2D) flow complexity metrics at the meso-habitat scale as explanatory variables for brook trout habitat preferences and as potential metrics to …
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Wave-, wind-, and tide-driven circulation at a well-mixed ocean inlet
… from and bottom flows going toward the bend. The depth-averaged dynamics are tidally asymmetric. Subtidal cross-channel flows are correlated (r² > 0.5) with cross-channel wind speed, suggesting that winds are enhancing and degrading the local-curvature induced two-layer flow, and driving …
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Energy Budget Analysis of Slow-Slip Tremor Events Along the Cascadia Subduction Zone Using Continuous GPS Array Data
… Cascadia locked zone between 30 and 40 km in depth. Averaged over many episodic tremor and slip events, the upper limit of transient slip in the vicinity of Seattle, Washington and Vancouver, British Columbia comes close to the heavily urbanized regions. Moreover, these events appear to …
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The vertical structure of the bottom boundary layer on the southern flank of the George Bank during late winter
… a current ellipse with eccentricity e ≈ 0.62 and depth-averaged current amplitudes of ≈ 40 cm/s. The magnitude of the depth-averaged mean flow is 9 ± 5 cm/s for the period investigated and small compared to the tidal currents. Estimates of friction velocities and bottom roughness were obtained …
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