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Showing 1 to 16 of 16 for “"Alluvial Rivers"”.
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Vertical Velocity Distributions in Sand -Bed Alluvial Rivers
Shear partition models of Einstein and Nelson-Smith were evaluated with the field data collected in this research. Einstein's method had an absolute average percent error of 11.3%, while the Nelson-Smith method had an absolute average percent error of 22.2% when the smaller bedforms were used as …
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Sediment Control In Alluvial Rivers Using Simulation-Based Optimization
During storm events in rivers and watersheds, the peak runoff may creates excess erosion and deposition in channels or river reaches and cause changes in flow characteristics and fluvial geomorphology. Severe sediment erosion such as in-stream sever bed and bank erosion or gullying can threaten the …
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Systematic connectivity in single thread meandering alluvial rivers: statistical generalization of hydraulic geometry
… travel. Depth connectivity is investigated in alluvial meandering streams as a solution to river navigability. These types of rivers are naturally ordered systems, which exhibits self-similarity amongst many scales. Four river sections and four experimental runs were used to investigate …
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Lateral response of alluvial rivers to the downstream passage of episodic sediment pulses
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-12-01
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Numerical Simulation of the Propagation of Fine-Grained Sediment Pulses in Alluvial Rivers
… propagation of these sediment-flow hazards in alluvial sand-bed rivers. Specifically, the study presented herein is divided into three separate parts to achieve this overarching goal. First, a component intended to improve the numerical modeling of morphodynamic processes in alluvial sand-bed …
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Geospatial analysis of specific degradation in South Korea
… in mountain regions and the other half represent rivers. The Modified Einstein Procedure (MEP) was used to determine the total sediment load at all stations. The Flow Duration – Sediment Rating Curve (FD-SRC) method was used to determine the sediment yield and specific degradation for all gauging …
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Flow-Transport Modeling and Quantification
… flow and sediment transport over bed forms in alluvial rivers (e.g. mean flow field, turbulence, shear partitioning, bed load transport and bed form geometry). Much of this work was either laboratory studies or small scale field investigations. Recently, advance in technology have improved the …
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Modeling the transport of sand and mud in the Minnesota River
… a study on the bankfull characteristics of rivers. The bankfull geometry of alluvial rivers is thought to be controlled by water and sediment supply, and characteristic sediment size. Here we demonstrate a novel finding: when bankfull shear velocity and bankfull depth are correlated against …
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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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Evaluating ecological function provided by bank stabilization in Box Canyon Reservoir, WA
… erosion is a dynamic natural process of alluvial rivers that humans often accelerate and then attempt to control. Traditionally, reduction of shoreline erosion is accomplished by structural means, such as vertical bulkheads and riprap/rock. However, hard bank stabilizing materials can …
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The influence of channel-skewed bedforms on flow structure in a high-amplitude meandering channel
… 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 across their …
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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, …
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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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Modelling fine sediment transport over an immobile gravel bed
… around the world that are not limited to the alluvial rivers with sandy beds. A variety of natural or human actions, such as fire, logging, flow diversion, road construction, and urban or agricultural development can increase the supply of sand to a gravel- and cobble-bedded rivers. From …
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Influence of riparian vegetation on near-bank flow structure and rates of erosion on a large meandering river
The dynamic process of meandering in alluvial rivers occurs through complex interactions among autogenic processes such as three-dimensional flow structure, channel planform geometry, and sediment transport. These internal processes can be strongly influenced by the geotechnical properties of the …
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Controls on and Morphodynamic Effects of Width Variations in Bed-load Dominated Alluvial Channels: Experimental and Numerical Study
… and the controls on width adjustment in rivers has a key role in developing management approaches able to account for the physical, ecological and socio-economical dimensions of a river system. Width adaptation in a river occurs due to erosion and accretion of banks, within various …