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 105 for “"Meander"”.
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The fluvial dynamics of compound meander bends
The dynamic evolution of the planform of meandering rivers often leads to the development of compound loops with multiple lobes of maximum curvature, also known as compound meander bends. At present, the interaction among spatial patterns of mean flow, turbulence, bed morphology, bank failures and …
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Meander migration with physically-based bank erosion
Interest in meander evolution has recently been revitalized with ongoing efforts worldwide to re-naturalize highly modified streams through re-meandering, with the consequent need of assessment tools. While research on meandering rivers has been very productive in the last five decades, among the …
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The fluvial dynamics of confluent meander bends
… channel. In contrast, natural rivers often meander and tributaries can enter meandering rivers on the outside of bends to form a junction planform known as a confluent meander bend. Experimental and numerical modeling studies have begun to document flow structure at confluent meander bends …
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Multi-Angle Beam Generation and Steering via Meander-Line-Coil EMATs
This thesis investigates Meander-Line Coil (MLC) Electromagnetic Acoustic Transducers (EMATs) for the purposes of Non-Destructive Testing (NDT), focusing on their theoretical foundations, simulated modelling, and experimental validations. Whilst the detection of defects was not investigated, this …
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From meander bend to oxbow lake: morphodynamics and sedimentology of chute cutoffs
Chute cutoffs are common features of meandering channels. The development of a chute cutoff locally shortens and straightens a meandering river channel, excavating a large volume of floodplain sediment as the chute channel deepens and widens. Bar development at the upstream and downstream ends of …
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Depositional Architecture of Confined Meander Belt Deposits, Lower Cretaceous Grand Rapids Formation, east-central Alberta
… units and fluvial bodies. A confined fluvial meander belt in the Colony Allomember is studied in detail using a high-resolution data set of densely spaced wells and seismic time slices. Sediment distribution within the meander belt is particularly fine-grained (i.e., siltstone-dominated), …
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Effect of width-to-depth ratio on the mean flow velocities for a Kinoshita meander bend
… on the mean surface velocities of a Kinoshita meander bend. The characteristics of flow in such a bend have been studied by Ancalle (2007) and Abad and Garcia (2009a) for width-to-depth ratios equal to 2.4 and 4.0. The present study extends that work and includes a higher width-to-depth ratio …
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Channel-forming discharge and river meander migration modeling of the Pilcomayo River in the area of Misión La Paz (Argentina) and Pozo Hondo (Paraguay)
… understand the river's morphodynamics, RVR Meander, a 2D depth-averaged analytical model, was used to assess the channel's planform evolution in time. The model uses a single discharge value for the simulations, thus estimation of a channel-forming discharge was necessary for the model …
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Meandering river dynamics
Meandering channels are dynamic landforms that arise as a result of fluid mechanic and sedimentary processes. Their evolution has been described by the meander morphodynamic equations, which dictate that channel curvature and bed topology give rise to local perturbations in streamwise fluid …
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Meandering rivers morphodynamics - integrating nonlinear modeling and remote sensing
… investigation of the morphodynamics of meandering rivers mostly involved the theoretical-analytical methodology. The development of analytical models enabled the definition of equilibrium conditions, stability and evolution of river meanders and to investigate the interaction between …
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Nonlinear Solutions to a Two-Layer Quasi-Geostrophic Model of the Gulf Stream
<p>The Gulf Stream shows a large meander off Cape Hatteras. This is driven by an energy conversion process known as baroclinic instability and observations suggest that nonlinearity is an important part in this process. In order to understand the fundamental role of nonlinearity in baroclinic …
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Research and Development of Low-Profile, Small Footprint Antennas for VHF-UHF Range Applications
… is to exploit the broadband characteristics of meander-line and helical (or "spiral") antennas typically applied in the microwave frequency range to the UHF-VHF range. I will also propose novel antenna geometries that combine spiral and meander-line properties and analyze their performance. …
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Numerical modeling of river migration incorporating erosional and depositional bank processes
… the nature of morphologic changes of meandering rivers has long attracted the attention of the scientific community, in the fields of fluvial geomorphology, hydraulic engineering and river restoration. Several meander evolution models developed over the years have provided a deeper …
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As the Starling Flies
… leaps. But science, it turns out, can also meander as much as a wandering bird.
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The evolution of the lower Missouri River: Stratigraphy, geomorphology, and habitat dynamics at Lisbon Bottom
<p>"A study of Lisbon Bottom, a confined meander bend of the Missouri River near Glasgow in central Missouri, as well as an overview of the Missouri River between Kansas City and St. Louis concludes that (1) with three minor exceptions, the southern limit of Pleistocene glaciation coincides very …
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Mode Water in the Sea of Japan: A Study on the Reproducibility of Mode Water in the Data-Assimilating Regional Navy Coastal Ocean Model
… eddies that form in the quasi-stationary meanders of the offshore Tsushima Warm Current. Previous work in this region has shown free-running, advanced ocean models are able to capture the physical processes that generate mode water; however, data assimilation is seen to ,I have a negative …
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Preferential and Non-Darcy Flows in the Hyporheic Zone: Surface Water-Groundwater Hydraulics and Effects on Stream Functions
… of macropores to hyporheic transport through meander bends was explored. Transport velocities, hydraulic head gradients, and solute transport rates through the meander bend were increased by macropores. Results indicate that macropores can dictate solute or pollutant transport through meander …
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