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 33 for “"Stream sediment"”.
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Development and application of field methods for determination of the extent of acid mine drainage contamination and geochemical characteristics of stream sediment recovery
… are deposited from the water column onto the stream bed downstream of the AMD input(s). The drivers of metal deposition onto stream sediments are through either the formation of insoluble colloids, adsorption to particles, or complexation with sediment surfaces. Metals can be removed from …
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Investigating the Use of Fallout Radionuclides Beryllium-7 and Excess Lead-210 as Short-Term Stream Sediment Chronometers in the Agricultural Upper Midwest, USA
Sediment pollution from agricultural fields is a concern for surface water quality in the Upper Midwest even with best management practices in place to prevent field erosion. Legacy stores of previously eroded field sediment may build up in streams over time and lead to persistent water quality …
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MERCURY DISTRIBUTION IN SOILS AND STREAM SEDIMENTS OF CENTRAL INDIANA, USA
An investigation of mercury (Hg) in soils and stream sediments was conducted to understand the impact of urbanization on Hg deposition and accumulation on the upper west fork of the White River watershed in central Indiana. Samples were collected to the north and east (i.e., downwind) of emission …
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Evaluating Watershed and Stream-Channel Drivers of In-Stream Turbidity in Virginia and North Carolina
Accurately predicting sediment delivery has been a long-standing problem in the field of water resource management. Many different watershed equations and models have been developed such as the Universal Soil Loss Equation (USLE), the Geo-spatial interface for the Water Erosion Prediction Program …
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Post-fire Response of Little Creek Watershed: Evaluation of Change in Sediment Production and Suspended Sediment Transport
… to identify changes in event-based suspended sediment export and determine the factors contributing to sediment production the first year following the Lockheed Fire in 2009. The amount and volume of near-stream sediment sources were found to decrease, while an increase in hillslope sediment …
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THE FABRICATION AND STUDY OF METAL CHELATING STATIONARY PHASES FOR THE HIGH PERFORMANCE SEPARATION OF METAL IONS
… the determination of beryllium in a certified stream sediment, uranium in seawater and a certified stream sediment, and cadmium, lead and copper in a certified rice flour. The results for each analysis fell within the certified limits, and reproducibility was good. The optimisation of post …
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The Effects of Land Use on Tumbling Creek Cave in Taney County, Missouri
… recharge area of the cave system, and surface streams linked to the cave system. This cave is of specific interest because of the karst nature of the area and the recent implementation of Better Management Practice (BMP). Water quality parameters were measured bi-weekly during one year and …
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Assessing the Potential for Carlin-type Gold in Northern Nye County, Nevada
Through the synthesis of regional stream sediment geochemistry and regional geologic maps using fuzzy logic-based mineral potential mapping, this study assesses the potential for Carlin-type mineral systems in northern Nye County. Robust factor analysis (FA) is applied to log ratio-transformed …
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Heavy Metal Content in the Stream Sediments of Wilson Creek in the Vicinity of the Southwest Wastewater Treatment Plant, Greene County, Missouri
… lead, silver, and zinc was determined in the stream sediments of Wilson Creek upstream and downstream from the effluent of the Southwest Wastewater Treatment Plant. The purpose was to determine if the effluent was contributing heavy metal quantities to the stream sediments. The mean content …
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Nitrogen biogeochemistry in Binghamton, NY, a medium-sized urban ecosystem
… than nonpoint-source N exported from eight urban streams to the Susquehanna River, which runs through the Binghamton area. The point-source N fluxes we measured from the B-JC WWTP were high because its function was impaired during the study, causing major environmental impacts on the Susquehanna …
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Environmental impact of mine drainage and its treatment on aquatic communities
… ecological and chemical analysis of eight Welsh streams impacted by mine drainage is used to discern the effects of water and sediment related variables and elucidate the most important variables in the impact of mine pollution on freshwater macroinvertebrate communities. The implications of this …
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Gold-enriched rims on placer gold grains: an evaluation of formational processes
… of expected complex concentrations in natural stream and stream sediment waters indicates CN⁻ and S² as the most likely functional ligands for the transport and redeposition of supergene gold. Electrolytic refining of placer Au-Ag grains is also a process for forming gold-enriched rims that can …
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Nanoscale geochemistry of critical elements; applications for mineral exploration and recovery from secondary sources
… that gold and silver NPs could be detected in stream sediments by spICP-MS, and were related to upstream mineralization. This work is expanded in Chapter 4, where a stream sediment survey of the concealed Sundance gold deposit was conducted, and results of conventional geochemistry are compared …
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An Improved Water-Driven Sediment Yield Model for Cold Agricultural Regions
Excessive transport of sediment in the world’s freshwater, typically from water-driven erosion occurring in agricultural regions, is a significant source of pollution and damage to the aquatic environment. Excess sediment erosion promotes the transport of phosphorus to lakes, which can increase …
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Quaternary geology of Rolette County, North Dakota
… Basic lithologies recognized in the surface sediments were bedded clay, silt, sand, and gravel; and three types of non-bedded diamicton. These were combined and, with bedding characteristics and organic content, formed 15 practical field mapping units. Geologically significant scarps and hill …
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Heavy Metal Content in Stream Sediments Adjacent to the Wright County, Missouri, Sanitary Landfill
Stream sediments from two intermittent streams located adjacent to a sanitary landfill were analyzed for copper, zinc, lead, barium, and chromium using atomic absorption spectrophotometry. The purpose was to determine if leachate emitted from the landfill transported these metals in solution and …
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Interactions Between Land Use and Local Lithology on Phosphorus Distribution in Northrup Creek Sediments, Monroe County, New York
… area also influences the chemical composition of stream sediment. Limestone bedrock results in high levels of calcium associated phosphorus. Northrup Creek, a mixed land use watershed in western Monroe County, New York, was examined to determine the main contributors of phosphorus in the creek. …
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Seasonal Variation in Rates of Nitrification Associated with Patterns of Carbon and Nitrogen Supply in a Southern Appalachian Headwater Stream
… is an important nitrogen (N) transformation in stream ecosystems. Experimental addition of dissolved organic carbon (DOC) has been shown to inhibit rates of nitrification, and rates have been stimulated by NH4-N addition. Insights regarding the role of particulate organic matter (POM) in this …
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The Biological Control of Spotted Knapweed in the Southeastern United States
… plants, increasing soil surface runoff and stream sediment yields, and reducing soil infiltration. A biological control program for spotted knapweed using <em>Larinus minutus</em> (Coleoptera: Curculionidae), was initiated in Arkansas in 2008. In this dissertation I described the releases of …
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