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Showing 1 to 20 of 23 for “"Meandering rivers"”.
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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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Curvature-Migration Relations and Planform Dynamics of Meandering Rivers
… advancing knowledge of the planform dynamics of meandering rivers. The intellectual merit of the research is the identification of the role of the spatial structure of planform curvature in the dynamics of meander migration. The new knowledge gained from the research provides an improved …
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The sedimentary architecture of meandering rivers: The influence of bend migration style
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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Non-cohesive bank migration in meandering rivers and bank accretion in weakly braided rivers
… in the dissertation is the migration of meandering rivers whose banks consist wholly, or partly, of non-cohesive bed-material-sized alluvial deposits; such banks are known as composite banks when the near-surface layers consist of fine-grained deposits. The relevant forces and …
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How do sand-bed meandering rivers co-construct their own bankfull discharge and bankfull channel geometry? Analytical and numerical study
Alluvial rivers are authors of their own geometry. Given water and sediment, a river constructs its own well-defined channel and floodplain. This channel is characterized by a bankfull width and depth, longitudinal slope, and bankfull discharge when the flow spills out onto the floodplain. No …
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Dynamics of river meanders: bankfull geometry and planimetric configuration
Meandering rivers are ubiquitous on the surface of the Earth and are key elements of every ecosystem they are embedded in. They distribute water, sediments and nutrients all over the floodplain, they provide a mean of transportation and energy production, and they offer many other ecosystem …
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Laboratory experiments on alluvial cover in mixed bedrock-alluvial meandering channels and on the formation and evolution of supraglacial meltwater meandering streams
Rivers and other channels containing liquid flow develop meandering patterns over different media and across a broad range of scales. For example, alluvial rivers form and evolve by erosion and deposition of sediment, and by interactions with riparian vegetation. Meandering channels also form in …
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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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Statistical Analysis of Fluvial Channel Belts
<p>As meandering rivers laterally migrate over time, they build channel belts. The accumulation of all previous flow paths creates the channel belt. To better understand these ancient rivers, modern river systems are being mapped to find statistical relationships between current flow path and the …
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Objectively identifying spatial variability in bankfull stage
… theory about process dynamics in alluvial meandering river systems for decades. As the flow that defines the transition between channel and floodplain and marks the level of incipient flooding, bankfull flow represents an important geomorphic and hydrological threshold. However, most field …
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Denudation rates and geomorphic evolution of the Cape Mountains, determined by the analysis of the in situ-produced cosmogenic 10BE
… Cape Mountains are traversed by deeply-incised, meandering rivers that cut canyons through the most resistant quartzite ridges of these mountains, perpendicular to their structural grain inherited from the CFB. The evolution of this landscape is poorly understood, because little quantitative data …
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Secondary Motion in Meandering Streams: An Experimental Study
Meandering is a common plan shape acquired by rivers. Its prevalence in the environment and highly dynamic nature make the mechanics of flow in meandering streams a great interest for engineers and scientists. Meandering streams are characterized by continuous variation of curvature in the …
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Multi-proxy palaeoclimate reconstruction of the permian-triassic mass extinction event
… across the P/Tr boundary linked to a shift from meandering rivers to conglomeratic alluvial fans. Most of the paleosols include pedogenic carbonates at different stages of development, both above and below the P/Tr boundary. By the Triassic there is evidence of depressed water tables and …
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Stratigraphy and sedimentology of the Sentinel Butte formation (Paleocene) near Lost Bridge, Dunn County, west-central North Dakota
… parts of the beds. Sand beds where deposited by meandering rivers as indicated by their tabular and U shapes, sedimentary structures, and textural analysis. Paleocurrent data suggest a general southeasterly stream flow.</p> <p>Silt, light yellow to grayish brown, makes up about 40% of the …
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The marine geology of Mossel Bay, South Africa
… received more rain feeding low-gradient meandering rivers and wetland lakes. These extensive wetland environments provided a rich source of diverse food types which along with abundant marine resources on the shoreline made the Southern Coastal Plain an ideal habitat for our ancestors.
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Meander migration with physically-based bank erosion
… 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 components associated with the process of meander migration -- hydrodynamics, sediment …
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The fluvial dynamics of confluent meander bends
… straight receiving 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 …
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The influence of surface - subsurface connectivity on groundwater flow and solute transport in a deltaic aquifer
… from infiltration of saline water from coastal rivers to fresher groundwater. Case 3 is lateral contamination from one vertical side, it includes two sub-cases: transient seawater intrusion and steady density-driven groundwater circulation. The simulation results show that contaminant transport …
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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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