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 18 of 18 for “"width-to-depth"”.
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Effect of width-to-depth ratio on the mean flow velocities for a Kinoshita meander bend
The present work analyses the effect of different width-to-depth ratios on the mean surface velocities of a Kinoshita meander bend. The characteristics of flow in such a bend have been studied by Ancalle (2007) and Abad and Garcia (2009a) for width-to-depth ratios equal to 2.4 and 4.0. The present …
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Secondary Motion in Meandering Streams: An Experimental Study
… motion, which is motion in the direction normal to that of the stream. This work concerns the mechanics of flow in meandering rivers, focusing specifically on secondary motion. A series of laboratory experiments was carried out in a meandering channel to resolve the three-dimensional flow …
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Flow patterns and energy dissipation rates in batch rotor-stator mixers
… of energy dissipation rate in a batch rotor-stator mixer fitted with disintegrating head have been numerically investigated. Standard k-e turbulence model in conjunction with sliding mesh method was employed and the simulation results were verified by laser Doppler anemometry (LDA) …
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Fabrication and characterization of nanofluidic channels for studying molecular dynamics in confined environments
… using PDMS substrate is generally limited to the thickness of -100 nm because of the softness of the materials. Also, the gas permeability of PDMS poses a significant challenge in the operation of the nanofluidic devices. We demonstrate that nanofluidic channels, as thin as 20 nm with high …
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Recovery of Channel Morphology and Benthic Macroinvertebrate Assemblages after Livestock Exclusion
… in paired stream reaches with and without livestock access in southwestern Virginia suggest that livestock exclusion practices installed on short, isolated stream reaches result in improved geomorphic and riparian vegetation condition, but do not significantly improve the benthic …
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Linking Stream Restoration Success with Watershed, Practice and Design Characteristics
In the United States, stream restoration is currently a billion-dollar industry. Though it is commonly used as a method for stream impact mitigation, Total Maximum Daily Load (TMDL) crediting, and stormwater management, there is little scientific knowledge defending stream restoration as an …
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A Survey of the Fishes and Habitat of the White River, South Dakota
… in South Dakota. The primary objectives were to 1) document the current species composition, relative abundance, distribution, and condition of fishes, and 2) quantify baseline physical habitat conditions. During July and August of 1998 and 1999, physical habitat was measured and fishes were …
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Investigation of hydrologic and sediment transport processes on riparian hillslopes
… adopted as best management practices (BMPs) to control nonpoint source pollution. The effectiveness of these zones in mitigating pollution is a function of the distribution, nature, and rate of water and sediment movement through these zones. The intent of this research was to investigate the …
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Unsteady aerodynamics using high-order methods
… unsteady flows occur as self-sustaining oscillatory fluid motion, such as the flow over rectangular cavities. There has been a significant amount of research performed on this topic over the years, both experimentally and numerically. The unsteady flow over rectangular cavities is the case study …
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Baseline data for assessing beaver dam analogs as a restoration tool in fire-affected tributaries of the Methow and Okanogan watersheds
… from their floodplains and no longer store water effectively. This leads to diminished ecosystem function, loss of critical riparian and aquatic habitats, and reduced biodiversity. Beaver dams improve incised streams by raising surface and groundwater levels, leading to reconnected …
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Evaluating the Long-Term Morphological Response of a Headwater Stream to Three Restoration Techniques
The stream restoration industry has been growing since the addition and modification of Section 404 to the Clean Water Act. Many projects follow the guidelines of Natural Channel Design and use in-stream structures to stabilize stream channels. Post-project monitoring rarely exceeds 3-5 years, and …
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Controls on post-High Park Fire channel response, South Fork Cache la Poudre Basin, Colorado
… the watershed scale. The goal of this study was to evaluate how the channel network contributes to the production, transport, and storage of sediment by monitoring post-fire channel response. A better understanding of channel production, transport, and storage of sediment post-fire is required in …
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Fishes and Habitat of the Belle Fourche River, South Dakota
… River in western South Dakota. My goal was to obtain a better understanding of the fish community and habitat in Great Plains prairie rivers. Specifically, my objectives were to 1) document the current distribution, species composition, and relative abundance of fishes, 2) quantify baseline …
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THE EFFECTIVENESS OF TROUT HABITAT RESTORATION IN EUSTACHE CREEK, A FORMERLY PLACER-MINED STREAM IN WESTERN MONTANA
… Studies The Effectiveness of Trout Habitat Restoration in Eustache Creek, a Formerly Placer-Mined Stream in Western Montana Committee Chair: Dr. Daniel Spencer Aquatic ecosystems in the western U.S. have been severely degraded over the last century by anthropogenic activities such as mining, …
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THE EFFECTIVENESS OF TROUT HABITAT RESTORATION IN EUSTACHE CREEK, A FORMERLY PLACER-MINED STREAM IN WESTERN MONTANA
… Studies The Effectiveness of Trout Habitat Restoration in Eustache Creek, a Formerly Placer-Mined Stream in Western Montana Committee Chair: Dr. Daniel Spencer Aquatic ecosystems in the western U.S. have been severely degraded over the last century by anthropogenic activities such as mining, …
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Modelling the morphodynamics of tidal channels
… systems has been investigated using numerical tools. As a first step the hydrodynamics and morphodynamics of both convergent and non-convergent tidal channels have been studied. The analysis has been made using a second order numerical scheme, solving the 1D flow equations and the continuity …
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Long-term morphological response of tide dominated estuaries
… by a funnel-shaped geometry with a high width-to-depth ratio. The width of the estuarine section tends to decrease rapidly upstream, following an exponential law and the bottom slopes are generally non-significant. In this thesis the long-term morphological evolution of tide-dominated …
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Controls on and Morphodynamic Effects of Width Variations in Bed-load Dominated Alluvial Channels: Experimental and Numerical Study
Understanding and predicting the effects of width variability 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 …