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Showing 1 to 20 of 62 for “"fluvial systems"”.
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Slope and bifurcation on braided distributive fluvial systems
Much of the current literature on ancient fluvial systems is based on studies of modern rivers, but fails to differentiate between degradational and aggradational systems. That is a problem because degradational systems are not preserved and therefore are not representative of fluvial systems found …
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Fluvial systems : a re-evaluation of Horton's laws
… tendency in its value for natural channel systems. It was found that the variability in the vertical properties of the drainage network as expressed by the stream gradient standard deviation is unaffected by changes in geology, basin maturity, or hydrologic characteristics, but varies …
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Plant organic matter mobilization and export in fluvial systems
… I tested if δD values of plant waxes in fluvial deposits reflect δD values of environmental waters in the respective catchments. I showed that surface water δD values in the Arun Valley and precipitation δD from south of the Himalaya both changed similarly during two consecutive years …
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Quantification and assessment methods for large wood (LW) in fluvial systems
… wood (LW) during floods regularly affects stream systems, infrastructure and communities all over the world. Due to a lack of applicable remote sensing methodologies in LW research, to date little is known about transport dynamics of wood in rivers. In order to expand the current understanding of …
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The Exchange of Fine Muddy Sediment in Gravel-Bed Fluvial Systems
… < 0.1 mm) in streams has many impacts on the fluvial system and those relying on it, both humans and aquatic biota. Previously, fine sediment was considered a washload and has been ignored in transport models. More recently, it has been treated as being transported once the surface gravel …
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Multi-scale stratigraphic and statistical analysis of allogenic and autogenic controls on fluvial systems
Fluvial systems are important hydrocarbon reservoirs around the globe, including the high net-sand content fluvial reservoirs of the North Sea and the low net-sand content Mungaroo of offshore Australia. Despite their economic significance, fluvial successions are a challenging reservoir type to …
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Conceptualizing Anthropogenic Change in Fluvial Systems: Drainage Development on the Upper Embarras River, Illinois
… into aspects of physical geography, specifically fluvial geomorphology, from both a conceptual and pragmatic point of view. The upper Embarras River in east central Illinois was utilized as an example of how such an approach can be utilized for a greater understanding of anthropogenically modified …
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Paleocene coal-bearing sediments of the Williston Basin, North Dakota : an interaction between fluvial systems and an intracratonic basin
… sediments whenever the Powder River Basin fluvial system episodically diverted between the Cedar Creek and Nesson Anticlines. Flow was initially southeasterly along the axis of the basin, beginning each new sedimentation interval. Northwest-southeast-trending sandy belts resulted, and …
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Depositional environments of a portion of the Bullion Creek Formation (Paleocene), Western Billings County, North Dakota
… Previous workers have postulated combinations of fluvial and lacustrine depositional environments for the rocks. </p><p> The study area covers 15 square kilometres in the badlands of the Little Missouri River in western Billings County, North Dakota, where approximately the upper 75 metres of the …
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Paleoenvironmental Variability across the Cretaceous-Tertiary Boundary in the Alberta Foreland Basin, as Interpreted from Fluvial Deposits and Paleosols, Red Deer River Valley, Alberta, Canada.
… (KT) boundary of south-central Alberta indicates fluvial aggradation and variability of paleosol morphology in response to foreland orogenesis. The depositional history records an evolution from amalgamated, multi-story, braided sand bodies to accretionary, single-story, overbank-prone meandering …
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The geometry of some Beaufort group sandstones and its relationship to uranium mineralisation
… were high sinuosity and were the larger fluvial systems; the straight channel and low sinuosity channel sandstones were generally much smaller and had as their names imply a much lower sinuosity. The palaeo-variability of current vectors in these systems, in the study area, is such that a …
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Cosmogenic dating of fluvial terraces in the Sorbas Basin, SE Spain
Long term fluvial incision spanning the Late Cenozoic is recorded in many fluvial systems around the world by terrace landform sequences. The incision manifests itself as inset sequences of river terraces which form terrace staircases. The timing of the onset of incision and the rate incision then …
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Sedimentology and Stratigraphy of the Coalmont Formation, Northwestern, North Park, Colorado, U.S.A.
… The Coalmont Formation consists of a variety of fluvial and lacustrine sedimentary facies that have not been documented in depth. Using geologic mapping, measured stratigraphic sections, outcrop scale sedimentology, paleocurrent analysis, sedimentary petrography and fluvial-lacustrine …
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Hydraulic and fluvial geomorphological models for a bedrock channel reach of the Twenty Mile Creek /
… for the application of numerical models. Bedrock fluvial systems exhibit boundaries that are typically less mobile than alluvial systems, yet they are still dynamic systems with a high degree of spatial and temporal variability. To understand the variability of fluvial systems, numerical models …
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The sedimentology and lithostratigraphy of the Upper Jurassic Lourinha formation, Lusitanian Basin, Portugal
… of the Lusitanian Basin marine shelf and slope systems were replaced by alluvial fan and fluvial environments which prograded from the nonh during the late Kimmeridgian. Continental environments, periodically punctuated by marine incursions, persisted over northern and central areas of the basin …
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Variations in the architecture of fluvial deposits within a marginal marine setting, Eocene Sobrarbe and Escanilla formations, Spain
Fluvial systems located near marginal-marine settings are prolific hydrocarbon reservoirs around the world. Outcrops that contain strata that can be correlated from fluvial deposits to coevally deposited marginal marine deposits are important because they provide a rare opportunity to relate …
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Historical Channel Adjustments in the Pascagoula River Basin and Adjacent Systems, Southeast Mississippi
… 13 rivers of the Pascagoula Basin and adjacent fluvial systems over the last 30-50 years, which could reveal hydrologic and sedimentary responses to natural causes such as flooding or various anthropogenic activities in the region, such as logging, urban development, and instream aggregate …
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Spatial Characteristics of Paleochannels in Association with the Mississippian/Pennsylvanian Systematic Boundary in Western and South-Central Kentucky
… Column Generator. Several trunk and tributary systems were identified in this study covering about 20 miles of channels. Fluvial systems have a maximum incisement of 370 feet. Results of this study provide a better understanding of the sub-Pennsylvanian topography that evidently is dependent on …
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Análise da estabilidade lateral em ambientes fluviais do semiárido paraibano.
… renovation and transformation, such as the fluvial systems. As the processes of lateral changes in river banks, are among the most recurrent processes in fluvial landscapes and the understanding of its mechanism of action is essential to the explanation of the evolution of the various …
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A Field Survey and Geographical Information Systems (GIS) Based Investigation of the Archaeological Landscape in the Niger River Valley, Republic of Benin
… remote sensing and Geographical Information Systems (GIS). An integration of these methods, which are commonly used in research out of Africa, showed the diverse nature of archaeology in this region. The field walking survey revealed the position of over 300 sites and around 50,000 material …
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