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 33 for “"bedload transport"”.
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Tidal velocity asymmetries and bedload transport in shallow embayments
… forced circulation can cause a net near-bed transport of sediment when the tidal velocity is asymmetric about a zero mean (flood or ebb dominant) and the transport rate is nonlinearly related to velocity. The relationship between elevation and velocity is elucidated here to enable one to …
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Tidal velocity asymmetries and bedload transport in shallow embayments
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1987.
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The Impact of Vegetation Morphology on Turbulence and Bedload Transport
… field, turbulence intensity, and sediment transport in wetlands, which impacts the erosion and deposition processes. By combining physical and numerical experiments, this thesis quantified how vegetation geometry impacts turbulence and sediment transport near the bed. In aquatic canopies, …
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Bedload Transport, Self Acceleration, Downstream Sorting, and Flow Dynamics of Turbidity Currents
… The plastic particles are carried mostly as bedload. Succession sustained flows are allowed to create a deposit behind a barrier that simulates the downstream end of a minibasin. The flows are introduced in the supercritical regime; the downstream barrier forces an internal hydraulic jump to …
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Bedload Transport in Gravel-Bed Streams under a wide range of Shields Stresses
Bedload transport is a complicated phenomenon in gravel-bed streams. Several factors account for this complication, including the different hydrologic regime under which different stream types operate and the wide range of particle sizes of channel bed material. Based on the hydrologic regime, …
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Modeling the Biogenic Effects of Freshwater Mollusks on Bedload Transport and Dynamics in a Gravel-Bedded Stream
… interaction of biogenic alterations in sediment transport modeling, and the range of spatial scales used to identify biogenic effects. Methods used to investigate potential influences include multivariate regression analysis performed for organism (freshwater mussel and Corbicula Fluminea) …
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Bedload transport: the effects of particle shape and an investigation of a wide range of transport rates
The effects of particle shape on bedload transport and a wide range of bedload transport rates using both bed subsurface and surface layer based approaches are investigated using fractional transport analysis with a similarity approach. Bedload transport data from a stream containing flat, low …
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Particle motion in the near bed region of a turbulent open channel flow: Implications for bedload transport by saltation and sediment entrainment into suspension
… of physical processes involved in the transport of sediment particles in the near bed region of a turbulent open channel flow. Two different aspects of this phenomenon are examined, namely the mode of transport denoted as saltation, and the process of particle entrainment into …
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Water Flow and Sediment Texture as Co-Varying Submersed Aquatic Vegetation (SAV) Habitat Requirements
… sizes characterized by sediment deposition, bedload transport and erosion. Water flow, sediment and SAV characteristics were also determined at vegetated and adjacent unvegetated areas at 11 study sites and sediment motion conditions assessed. Greater SAV biomass was developed by Z. marina …
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The effect of fluid acceleration on sediment transport in the surf zone
… consequences of this dissimilarity on sediment transport is not fully understood. This thesis develops methodologies to predict sediment transport under these asymmetric, skewed waves. Two different transport mechanisms are considered: bedload transport and "subsurface" transport. The potential …
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Transporte de sedimentos como carga de fondo en la cuenca del río Narcea (vertiente norte de la Cordillera Cantábrica)
… de drenaje puede ser percibida como una cinta transportadora que acarrea agua y sedimento desde las zonas de cabecera hasta las áreas de sedimentación marinas. Así entendido, el sistema fluvial representa el enlace necesario entre los procesos erosivos y los procesos sedimentarios. Una adecuada …
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Turbulence and macro-turbulence in the bottom boundary layer downstream of large-scale bedforms; implications for sediment transport
… layer (BBL) flow characteristics and on sediment transport are analysed in a natural shallow coastal site and in a laboratory flume. The main signature of flow/bedform interaction processes consists of large scale flow structures, generated downstream of the bedforms; these are characterised by …
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SAMPLING AND MODELING OF SEDIMENT TRANSPORT AND RESERVOIR EROSION FOLLOWING DAM REMOVAL: MILLTOWN DAM, MONTANA
Measurements of bedload transport in combination with suspended sediment and discharge data collected by the USGS illustrate the rates, magnitudes and processes by which reservoir sediment evacuated the Milltown Reservoir after the 2008 removal of Milltown Dam from just downstream of the confluence …
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SAMPLING AND MODELING OF SEDIMENT TRANSPORT AND RESERVOIR EROSION FOLLOWING DAM REMOVAL: MILLTOWN DAM, MONTANA
Measurements of bedload transport in combination with suspended sediment and discharge data collected by the USGS illustrate the rates, magnitudes and processes by which reservoir sediment evacuated the Milltown Reservoir after the 2008 removal of Milltown Dam from just downstream of the confluence …
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Enhancement of fine particle deposition to permeable sediments
… of deposition rate are integral to the transport of many constituents including contaminants, organic matter, and larvae. Review of the literature demonstrates a general appreciation for the potential control of deposition by bed roughness, but no direct tests involving flat sediment …
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The effects of groundwater seepage on stream regimen : a laboratory study
… has little effect on stream competence or transport rate, even when quicksand conditions are reached. The decrease in effective grain density brought about by uptward seepage might possibly be compensated entirely or in part by a decrease in surface drag and an increase in form drag on …
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Trapping Efficiencies for the BLH-84, Helley-Smith, Elwha, and TR-2 Bedload Samplers
Bedload-trapping efficiencies for four types of pressure-difference bedload samplers – a standard Helley-Smith (intake-nozzle width and height of 76.2 mm x 76.2 mm), BLH-84 (76.2 mm x 76.2 mm), Elwha (203 mm x 102 mm) and Toutle River-2 (305 mm x 152 mm) a standard Helley-Smith, US BLH-84 (both …
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Enhancement of fine particle deposition to permeable sediments
… of deposition rate are integral to the transport of many constituents including contaminants, organic matter, and larvae. Review of the literature demonstrates a general appreciation for the potential control of deposition by bed roughness, but no direct tests involving flat sediment …
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Simulation of suspended sediment and contaminant transport in shallow water using two-dimensional depth-averaged model with unstructured meshes
… and human activities, the problems of sediment transport and environmental hydraulics have been becoming more and more important and valued. Computational fluid dynamics is a very useful and powerful tool in those studies. In 2008, Dr. Liu developed a two-dimensional model HydroSed which solves …
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Determination of Optimal Stable Channel Profiles
… curving boundary does not allow for sediment transport, which is an essential feature of natural rivers and streams. That model has thus been modified to predict the shape and stress distribution of an optimal stable channel; a channel with a flat-bed region over which bedload transport …
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