Global ETD Search
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Showing 1 to 8 of 8 for “"River beds"”.
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The regulation of sand mining in South Africa
… damage to riparian habitat and the alteration of river beds and banks. Sand mining in South Africa is controlled by a complex regulatory system that can be distilled into three main themes: mineral regulation; environmental regulation; and land use planning regulation. In this thesis, it is …
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Examining the Molluscan Biostratigraphy of the Upper Cretaceous Judith River Formation, Montana
<p>The "Judith River beds" were discovered by F.V. Hayden in 1855. F.B. Meek helped classified the specimens that Hayden had collected. In the documentations Meek and Hayden, the specimens were collected from the “Judith River Badlands.”' There was no documentation on where in the Judith River …
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Temporal and Spatial Variation of Fine Sediment Infiltration in a Gravel-Bed River
Pulses of fine sediment in gravel-bedded rivers can cause extensive fine sediment infiltration (FSI), potentially altering river morphodynamics and aquatic ecosystems. FSI occurs when sand and silt are deposited into void spaces between larger grains at the riverbed. Flume and theoretical modeling …
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Temporal and Spatial Variation of Fine Sediment Infiltration in a Gravel-Bed River
Pulses of fine sediment in gravel-bedded rivers can cause extensive fine sediment infiltration (FSI), potentially altering river morphodynamics and aquatic ecosystems. FSI occurs when sand and silt are deposited into void spaces between larger grains at the riverbed. Flume and theoretical modeling …
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Smart rocks for bridge scour monitoring -- Design and localization using electromagnetic techniques and embedded orientation sensors
<p>"River bridge scour is an erosion process in which flowing water removes sediment materials (such as sand, rocks) from a bridge foundation, river beds and banks. As a result, the level of the river bed near a bridge pier is lowering such that the bridge foundation stability can be compromised, …
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Modeling of surges caused by the release of breakup ice jams
… can cause substantial damage to property, erode river beds, endanger hydraulic structures and affect safety at river crossings. The current understanding of the breakup ice jam phenomena is insufficient and therefore the state-of-the-art is not well advanced. There is an urgent need to improve …
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Experimental investigation of the impact of the permeable layer thickness on the surface flow above and the threshold for incipient motion of submerged objects
… forces exerted on submerged objects. Natural river beds are permeable and the impact of the presence of bed permeability or the thickness of the permeable bed on the threshold for incipient motion still remain unclear. The main research questions of the systematic experimental study in this …
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In situ characterization of sediment oxygen demand across the spectrum of non-resuspension to full resuspension with varying bed shear stress
Sediment oxygen demand (SOD) can be a significant oxygen sink in various types of water bodies, particularly slow-moving waters with substantial organic sediment accumulation. In most settings where SOD is a concern, the prevailing hydraulic conditions are such that the impact of sediment …