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 437 for “"gravel"”.
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Ellipses of Gravel
<p>This manuscript was my attempt to create a collection of poetry that could potentially be published as a book. I wrote and revised poetry in accordance with lessons learned from several of the authors I studied at Eastern Kentucky University. Workshop courses offered valuable feedback from …
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Cottonwood Establishment in a Gravel-Bed River
… pristine, 5th order, wandering floodplain of the gravel-bed Flathead River, Montana, USA. The focus of my research was to determine the mechanisms explaining successful recruitment on recently formed, unvegetated bars, covering a range of spatial scales from within-bar (~ 1 to 10 m) to …
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Cottonwood Establishment in a Gravel-Bed River
… pristine, 5th order, wandering floodplain of the gravel-bed Flathead River, Montana, USA. The focus of my research was to determine the mechanisms explaining successful recruitment on recently formed, unvegetated bars, covering a range of spatial scales from within-bar (~ 1 to 10 m) to …
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Adhesive areal sampling of gravel bed streams
… to be one of the most important features of a gravel bed stream. Since this surface layer consists of a distinct population of material, it is necessary to be able to separate it from the underlying material and quantify it distinctly. This is done through surface sampling. Two of the most …
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Gravel barrier dynamics, coastal erosion and flooding risk
This thesis considers the influence of gravel barrier dynamics on coastal erosion and flooding risk. Establishing the potential for coastal landforms to provide effective risk reduction is salient given growing momentum behind coastal management approaches seeking to incorporate ‘natural’ processes …
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Interaction of Clay Wash Load With Gravel Beds
… on the interaction of wash load particles with gravel bed rivers. The effects of excess fine sediment loading to streams on general water quality, contaminant transport, and benthic organism mortality has been well examined. A fundamental assumption in fluvial geomorphology and river engineering …
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Sampling spatial sediment variation in gravel-bed streams
A gravel-bed stream's grain size distribution plays an important role in determining a river's depth, sediment transport rates, and stream bed stability as well as the survival rates of mussels and salmonids. Unfortunately, the material found in gravel-bed rivers exhibits vertical stratification as …
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Numerical Modelling of Braiding Processes in Gravel-Bed Rivers
Gravel-bed braided rivers are distinctive natural environments that provid a wide range of key environmental, economic and recreational services. There is, however,a growing concern that over the twentieth century, an increasing number of braided rivers have metamorphosed into wandering or single …
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Modelling fine sediment transport over an immobile gravel bed
… development can increase the supply of sand to a gravel- and cobble-bedded rivers. From hydrodynamics point of view, if the coarsest part of the sediments mixture composing the bed grain size composition cannot be transported, a coarser immobile layer can develop through vertical sorting of grain …
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Morphodynamics, sedimentation and sediment dynamics of a gravel beach
The morphodyiiamics of a gravel barrier beadi in Devon, \JK (Slaptou Sands: tau/S 0.15 - 0.25, D50 2 - 8min), was studied with reference to its sedimentology. Three time scales were sampled for nearshore hydrodynamics, intertidal morphologies and sediirientologies. A series of surveys were carried …
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Site Response Characteristics of Compacted Gravel Fill in Iceland
… and replacement of in-situ soils with compacted gravel-sized volcanic rock has been prevalent in the Icelandic foundation subgrade construction practice for decades, despite the unknown seismic site response characteristics of the fill (e.g., the predominant frequency and relative site …
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Calculating and Limiting Local Strains in Geomembranes From Gravel Indentations
Short-term tensile strains that arise from local gravel indentations in municipal solid waste landfill base geomembrane liners are investigated with an emphasis on quantifying how strains are obtained and providing methods for limiting long-term local geomembrane strains below allowable levels. …
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Experimental investigation of wave-induced morphological changes of gravel beaches
Gravel beaches are widespread around the North-Atlantic Ocean shorelines and can also be found along the coastlines of New Zealand, Russia and the Pacific shore of USA. Over the past decades, researchers in coastal morphodynamics have placed their emphasis on studying sand beaches but gravel …
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The bearing capacity and settlement of gravel piles in clay
The writer has been interested in the subject of gravel piles for a number of years and has been suprised at the lack of rational design methods. When the piles are inserted in sand their purpose is mainly one of densification and their effectiveness is usually measured by a Dutch Cone Penetrometer …
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Quantification of Trapped Diluted Bitumen Droplets in Gravel: an Experimental Study
… droplets that get trapped in the sediment in gravel-dominated rivers by hyporheic flow; to investigate the effects of velocity, gravel size and clean water wash on the interaction between dilbit droplets and gravel porous media; and to determine the predominant droplet retention mechanism. …
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Hydrodynamics and sedimentary structures of antidunes in gravel and sand mixtures
… clear distinction can be drawn between sand and gravel antidunes, with gravel antidunes having comparatively much lower velocities in the trough region, and turbulence stresses (ejections, sweeps, turbulence Intensity, TKE and Reynolds Stress) an order of magnitude higher than for sand bedforms. …
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The Exchange of Fine Muddy Sediment in Gravel-Bed Fluvial Systems
… treated as being transported once the surface gravel layer that stores it is able to be mobilized. We propose that the surface layer need not be mobilized in order for muddy sediment to travel through the fluvial system in a series of erosive and depositional events. Our first study uses a new …
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Physical and Biological Impacts of Gravel Mining on Three Southwest Missouri Streams
In southern Missouri, gravel mining is a small but widespread industry that is based on physically removing gravel from stream channels and flood plains. It is well documented that gravel mining negatively impacts streams in many different ways, including alternations in habitat, flow, and the …
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Interaction between anglers and coarse fish populations in two gravel-pit lakes
… biology of the coarse fish species in two gravel-pit fisheries (A and B) in Suffolk were studied from 1974 to 1977. Simultaneously the fish caught by anglers and their angling technique were monitored by census. Environmental factors were recorded on each census occasion and the crustacean …
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