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 53 for “"channel morphology"”.
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Channel Morphology and Riparian Vegetation Influences on Fluvial Aquatic Habitat
… to riparian vegetation management to local channel morphology can have hierarchical relationships to local (meso- and macro-) in-stream habitat characteristics. This research examined these influences first by examining the influence of complex channel morphology on meso-scale brook trout …
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Lithologic Controls on Bedrock Channel Morphology in the Buffalo River Basin
… systems remains an explained phenomenon in geomorphology. Current landscape evolution models assume an equilibrium state between rock uplift rates and erosion rates. However, analysis of chi gradients of bedrock channels across several lithologies in the Buffalo River Basin reveals …
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Recovery of Channel Morphology and Benthic Macroinvertebrate Assemblages after Livestock Exclusion
… livestock exclusion can significantly increase channel depth and decrease the width to depth ratio, and increase groundcover vegetation growth, but do not significantly alter benthic macroinvertebrate assemblages; and, 2) qualitative geomorphic assessment results showed trends over time since …
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The impact of run-of-river dams on channel morphology and sedimentation
… of dams on the characteristics of fluvial channels upstream and downstream of these structures have mainly focused on the effects of large impoundment dams. However, many dams in the United States are run-of-river structures, which do not extend in height about the elevation of the bankfull …
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Assessing the magnitude and frequency of hydrological processes and their effect on threshold channel morphology, North Bosque River, TX.
The North Bosque River (NBR) is a dynamic fluvial system experiencing geomorphic change resulting from hydrological and sedimentological influences. This thesis describes the forces that influence hydrological and geomorphological shifts along the NBR corridor, emphasizing the relationship between …
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Implications of Best Management Practices on Channel Evolution within the Bad River Watershed: West Central South Dakota
Stream channel morphology is highly variable among different landscapes due to differences in geology, topography, climate, and land use. Understanding a river system’s channel morphology is particularly useful due to regional relationships between channel form and sediment conveyance. The Bad …
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Virtual Worlds and Conservational Channel Evolution and Pollutant Transport Systems (Concepts)
Many models exist that predict channel morphology. Channel morphology is defined as the change in geometric parameters of a river. Channel morphology is affected by many factors. Some of these factors are caused either by man or by nature. To combat the adverse effects that man and nature may cause …
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Urban Channel Erosion Quantification in Upland Coastal Zone Streams of Virginia, USA
To quantify sediment contributions due to urban channel enlargement, 50 study sites were selected on 1st- through 3rd-order streams, in watersheds with varying levels of urbanization, in two Physiographic Regions (Coastal Plain and Piedmont), and in the Coastal Zone Management Area of Virginia. At …
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Holocene Periods of Aggradation and Incision, Hanson Creek, Washington
… Washington provide insight into changes in channel morphology and paleoenvironment within the region over the last 8000 years. Stratigraphically and spatially coincident archaeological evidence reveals information related to human occupation during the latter half of the epoch. Using LiDAR …
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Transport and retention of benthic marine invertebrates in the Southern Tauranga Basin
… were used to investigate the effect of estuary morphology on the transport and retention of benthic invertebrate larvae in Tauranga Harbour, a large (218 km2), shallow (mean depth = 2.8 m) meso-tidal estuary. Previous studies indicate that residence times extracted from hydrodynamic modelling …
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Quantification and assessment methods for large wood (LW) in fluvial systems
… as well as for the detection of changes in channel morphology due to LW obstructed flow conditions. The technique uses two-dimensional (2D) images, with large image overlap, for the generation of 3D point cloud models, which are edited and meshed, following a new workflow-pipeline for LW …
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Land Use and River Systems: Impacts of Suburban Residential Development on Channel Stability and Water Supply, Oak Ridges Moraine, Southern Ontario
… Moraine in mind, this study examined the geomorphology and hydrology of streams running through small, primarily residential developments in the Humber River headwaters. Local scale impacts were analyzed by comparing paired upstream reference reaches to reaches downstream of developments in …
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Investigating the effects of AC voltage signals on micro-channels machined with the Spark Assisted Chemical Engraving process
… and correlated with surface quality and channel morphology. Sodium and potassium hydroxide solutions were used, and the combined effects of electrolyte type and waveform were mapped to show how they affected machining efficiency. The study also examined temperature in SACE by comparing …
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Streams in a changing landscape : identifying candidate reference reaches to assess the physical and biotic integrity of Missouri's wadeable streams
… regression trees to model the influence of channel morphology, substrate, cover, and water quality, and watershed-level flow modification and fragmentation, urbanization, agriculture, and point-source pollution on stream fish and aquatic macroinvertebrate community characteristics of …
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Establishing an unambiguous connection between grain size and style of sediment transport in the Lower Niobrara River, Nebraska, USA
… because bedload has a dominant control on channel morphology while suspended load dominates the formation of overbank deposits. Experimental data has related the style of sediment transport to mean flow conditions and bed topography. However direct application of this method in natural, …
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The Dynamics of Coarse Sediment Transfer in an Upland Bedrock River
Bedrock channels in UK upland environments have received relatively little attention despite their importance within upland river systems and their influence on controlling the conveyance of sediment downstream. This thesis aims to quantify and model the transfer of coarse sediment through Trout …
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Patterns of Taxonomic, Functional, and Phylogenetic Diversity, and Ecological Drivers of Stream Fish Assemblages in East Texas
… maximum entropy approach, and factors related to channel morphology (e.g., stream order, slope) and land cover type (e.g., agriculture) were important predictors of species occurrence.</p>
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An ecological evaluation of an urban stream restoration in West Chicago, Illinois
… East Branch, especially in regards to substrate, channel morphology, and pool and riffle quality. Water quality did not vary between the streams except for flow, which was higher on the West Branch. The macroinvertebrate community on the restored West Branch was more diverse, and included more …
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