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 15 of 15 for “"Point Bars"”.
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Heterogeneity, paleohydrology, and 3D facies architecture of ancient point bars, Ferron Sandstone, Notom Delta, South-central Utah
… the paleographic map, the formative river of the point bar complex was interpreted to be a low sinuosity river. The point bar complex consists of four successive component point bars and shows a migration pattern that changes from expansion to translation with increasing sinuosity. By using …
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The Influence of Fluvial Geomorphic Processes on Spatial Patterns of Forest Primary Succession
… primary successional forests along depositional point bars at river bends of the Bogue Chitto River, Louisiana, USA and on nine additional rivers in the southeastern US. I hypothesized that geomorphic processes associated with river planform cause patterns of tree species to vary predictably …
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Depositional Architecture of Confined Meander Belt Deposits, Lower Cretaceous Grand Rapids Formation, east-central Alberta
… due to the large scale of channels and point bars imaged in seismic data. The fine-grained character of the meander belt is likely a result of: (1) a propensity for muddy counter point bar preservation at the expense of sandy point bar deposits; and (2) limited supply of sand to the …
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From grain to floodplain: evaluating heterogeneity of floodplain hydrostratigraphy using sedimentology, geophysics, and remote sensing
… in the East River Basin, Colorado, USA, combines point-, meander-, and floodplain-scale data to explore the importance of detailed field studies and physical representation of alluvial aquifers. We combine sediment core descriptions, hydraulic conductivity estimates from slug tests, …
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3D seismic attribute analysis and machine learning for reservoir characterization in Taranaki Basin, New Zealand
… system such as fluvial dominated channels, point bars, and nearshore sandstone. The study follows a consecutive workflow that leads to several attribute maps for identifying potential prospects"--Abstract, page iv.</p>
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High- and low-sinuosity stream deposits of the Sentinel Butte Formation (Paleocene) McKenzie County, North Dakota
… regime due to accretion of laterally-migrating point bars. Inset in the sand beds are channelplug deposits that are narrow and arcuate in map view and asymmetrically trough shaped in cross-section, and consist of sandy silt and clay. Lowsinuosity channel deposits occur as elongate, trough-shaped …
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Suspended sediment supply dominated by channel processes in a low-gradient agricultural watershed, Wildcat Slough, Fisher, IL, USA
… is allowed to freely meander and has established point bars and outer banks. The relative contributions of sediment from each land type are estimated using geochemical fingerprinting. A suite of tracers showing significant variances between the different land types within the Wildcat’s watershed …
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Process Sedimentology and Three-Dimensional Facies Architecture of a Fluvially Dominated, Tidally Influenced Point Bar: Middle McMurray Formation, Lower Steepbank River Area, Northeastern Alberta, Canada
… a fluvially dominated, tidally influenced point bar that experienced strong seasonal variation in river discharge. Annual fluctuations between river-flood stage and low-flow stage are responsible for the deposition of fluvially dominated sand beds alternating with brackish, tidally …
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Comportamiento morfodinámico e hidrosedimentológico de un sistema de canales mesomareales del estuario de Bahía Blanca
… en ellos. Los rasgos morfológicos (dunas, point bar, bancos elongados), junto con los datos de corrientes indican la dominancia del reflujo. En consecuencia, el modelo de circulación de sedimento, con máximos valores de transporte en El Alambre (0,08773 gr cm-1 seg-1), revela una …
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The influence of channel-skewed bedforms on flow structure in a high-amplitude meandering channel
… boundary configurations of ripples, dunes, and bars along alluvial rivers. The instantaneous boundary morphology heavily influences the local flow structure, especially within meander bends, and the temporal evolution of these interactions determines the behavior of channels as they migrate …
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The sedimentology of bedforms to barforms within tidally-influenced fluvial zones (TIFZx): lower Columbia River, OR/WA, USA, and the lower Chehalis River, WA, USA
… and (d) time series of aerial imagery of point-bar deposits across the lower Chehalis River TIFZ. These results show that point-bars located within the fully-fluvial to mixed tidal-fluvial regimes undergo relatively rapid laterally-oriented migration (> 1.5 myr-1), and possess an internal …
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Meandering rivers morphodynamics - integrating nonlinear modeling and remote sensing
… local and bend scale, as well as the dynamics of bars in meandering rivers represent two major unsettled issues in our present understanding of river meandering dynamics. In this thesis I first provide a systematic methodology for the automated extraction of meandering river morphodynamic …
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Valley Widening and the Composite Nature of Valley Margin Sequence Boundaries: Evidence from the Neilson Wash Compound Valley Fill, Cretaceous Ferron Sandstone, Utah
Incised valleys are at the center of a debate about whether sequence boundaries are chronostratigraphically significant. Current research has suggested that the sequence boundary that makes up the floor and walls of an incised valley is constantly being modified throughout the entire relative …
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The fluvial dynamics of compound meander bends
… factors, including deflection of the flow by point bars and failed bank blocks, can enhance or inhibit the development of high near-bank velocities and turbulence kinetic energy. The loop has elongated and become more asymmetric over time—a pattern of development consistent with patterns of …
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Non-cohesive bank migration in meandering rivers and bank accretion in weakly braided rivers
… of unimpeded removal with respect to basal endpoint control is formalized into a rational, dimensionless migration rate formula; it sets an upper bound on migration rate in the absence of any confounding effects such as bank armoring or boundary shear stress modifications (vegetation, bank …