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 37 for “"Bed Load"”.
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Bed-load transport of mixed-size sediment
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmosphere and Planetary Sciences, 1987.
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The development of an ultrasonic Doppler bed-load velocimeter
… and employs ultrasonic methods for detecting the bed-load particle velocity. Its application is in the mining industry for measuring the bed-load velocity of high concentration slurries such as in tailings and backfill hydraulic pipelines. Analyses have been conducted to investigate methods for …
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Field Use Of An Acoustic Surrogate System To Monitor Gravel Bed Load Flux
… and surrogate methods. Physical methods include bed load traps that provide data over a specific time frame, but the fluctuation of sediment can change drastically over hours; thus, bed load traps are unable to provide a reliable predictive model. Since studies have shown a relationship between …
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Controls on and Morphodynamic Effects of Width Variations in Bed-load Dominated Alluvial Channels: Experimental and Numerical Study
… factors, and quantification of the riverbed morphodynamic response to width variability is of crucial importance to support effective river management. The practical and engineering interest on stable cross-sections of alluvial channels has attracted a considerable amount of scientific …
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Medium-term response of lowland river reaches to changes in upland land use.
… century. As a consequence of afforestation the bed load yields of upland catchments have been shown to increase substantially. The upland catchment bed load is transported downstream, through the transfer zone to the lowland reaches where it may enter storage in barforms, cause flow diversion …
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Impacts of vegetation-generated turbulence on sediment transport
… or not. Second, the impact of vegetation on the bed load transport rate was explored. A system that allows sediment to be bypassed, a cart to distribute sediment, a method that measures the dry weight of wet sand without drying the sediment, a topography system, and an sediment trajectory imaging …
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Sponge media drying using a swirling fluidized bed dryer
… This study proposes the swirling fluidized bed dryer as a novel drying technique for sponge media. Batch experiments were conducted to study the bed’s hydrodynamics followed by drying studies for three bed loadings of 0.5 kg, 0.75 kg and 1.0 kg at three drying temperatures of 80°C, 90°C and …
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The Role of Instantaneous Forces in Particle Movement
… and equations have been developed to predict bed load transport rates, most of which use some comparison between shear stress and critical shear stress. The critical shear stress is determined by the point of incipient motion. Researchers have attempted to predict bed load transport both …
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Three-Dimensional Numerical Modeling Of Multiple-Sized Sediment Transport Modeling Under Current And Waves
… is developed. The coastal circulations are described by a three-dimensional hydrodynamic model, which is governed by the three-dimensional phase-averaged shallow water flow equations coupled with wave radiation stresses. Methods are also developed to determine the bed shear stress due to current …
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Phosphorus transport in the Berg River, Western Cape
… column, and transportation of phosphorus in the bed load.
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Θραύση λιθορρίπτων φραγμάτων λόγω υπερχείλισης: [υπό] Νικολάου Κ. Σφακιανάκη
… GRANULAR MATERIAL. THIS MODEL IS BASED ON THE BED LOAD FORMULA OF SHIELDS, ADAPTED TO THIS PHENOMENON. THE CONDITIONS OF SIMILITUDE ARE ALSOEXAMINED.
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Turbulence in geophysics: from rotating, ionized fluids to sediment transport
… in the system. Part II: "Intermittency in bed load sediment transport." Sediment transport by wind or water near the threshold of grain motion is dominated by rare transport events. This type of intermittency, termed 'on-off' intermittency, makes it difficult to calibrate sediment transport …
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Bathymetric evolution of sand bed forms under partially standing waves
… between water waves and a movable sand bed were investigated. Monochromatic and poly- chromatic waves of specified amplitudes and period were generated under cases of weak (R=0.2) and/or strong (R=0.9) reflections. Experiments included one of two mean grain sand sizes (0.2mm and O.mm) to …
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Distinguishing flood frequency and magnitude in the morphodynamics and sedimentology of rivers: insights from the South Saskatchewan River, Canada
… the ability to transport the medium sized sand bed load. In the subsurface, no distinct flood signature has been left, as flood deposits are similar to the scale and composition of deposits produced by low-magnitude high-frequency floods. Consequently, little evidence of such a flood event will …
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Modelling the morphodynamics of tidal channels
… equations and the continuity equation for the bed evolution in order to point out the main characteristics of the phenomenon. Numerical results show that the behaviour is non-linear also for relatively small values of the ratio between tidal amplitude and mean flow depth. The morphodynamic …
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Analysis of 2-axis pencil beam sonar microbathymetric measurements of mine burial at the Martha’s Vineyard Coastal Observatory
… climate, unsteady flow hydrodynamic forcing, and bed-load transport. The analysis examines the relative roles of these mechanisms in the scour-infill-bury process.
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Analysis of 2-axis pencil beam sonar microbathymetric measurements of mine burial at the Martha's Vineyard Coastal Observatory
… climate, unsteady flow hydrodynamic forcing, and bed-load transport. The analysis examines the relative roles of these mechanisms in the scour-infill-bury process.
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Assessing the impacts of riparian land use on gully development and sediment load : a case study of Nzhelele River Valley, Limpopo Province, South Africa
… land uses to gully development and sediment load on the Nzhelele River Valley in the Limpopo Province. Data was collected using different methods such as observation, field data techniques and experiments. Satellite digital images, topographic maps, aerial photographs and the sediment load …
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Flow-Transport Modeling and Quantification
… on the 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 …
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The Effect of Wall Jet Flow on Local Scour Hole
… horizontal wall jets on rough, fixed and mobile beds in open channel flow. Experimental tests were carried out, using fixed and mobile sediment beds. Computer simulation models for the flow within the jet and resulting sediment transport were developed and their results analysed in this study. In …
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