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 22 for “"Small stream"”.
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Zinc distribution in a small stream receiving treated textile wastewater
… were collected in June, 1977. Effluent and stream water samples were analyzed for various water quality parameters and for suspended, dissolved, and total zinc. Sediment samples were analyzed for zinc and percent loss on ignition. The treated textile waste water was the major source of zinc …
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Geographic expansion and small stream use by three species of invasive Asian carp in Illinois
… rivers) and little is known about the use of smaller rivers and streams by Asian carp. Because small streams are usually less productive than larger rivers, they may be more vulnerable to potential depletion of zooplankton, phytoplankton, aquatic vegetation, and other negative effects from …
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Rates and patterns of temperature mixing at a small stream confluence under variable incoming flow conditions
… conditions locally as well as farther downstream. Nevertheless, variations in rates and patterns of mixing at confluences under different flow conditions are poorly understood. This study examines the influence of momentum flux ratio, total discharge, and density differences between …
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High-resolution spatial and temporal evolution of two-dimensional flow structure at a small stream confluence
… apex, a region of low velocities at the downstream junction corner, and a region of merging of the two flow along a mixing interface within the center of the confluence. Interaction between the incoming flows varies over time in the form of episodic pulsing in which one of the two tributaries …
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Changes in the invertebrate populations, fish populations, and water chemistry of a small stream above and below two impoundments
… particle organic matter being transported downstream and its replacement by finer organic matter. The alterations manifested themselves in changes in numbers and biomass of benthic macroinvertebrates and fish, and changes in drift patterns below the ponds. The energy dynamics alterations may …
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Chemical, biological, and physical aspects of a small stream highly polluted by sewage over a long period of time
… chemical, biological and physical aspects of a small, highly polluted stream, and an attempt was made to correlate the collected data sith the available information on the subjects involved.
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Fish and Habitat Relations at Multiple Spatial Scales in Cheyenne River Basin, South Dakota
… relations have not been extensively studied in streams of Northern Great Plains. I analyzed fish distributions and investigated relations of reach (e.g. channel shape, substrate) and landscape scale (e.g. catchment area) factors to small stream fish communities, in Cheyenne River Basin. Reach …
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Southeast Michigan wastewater treatment plants as potential sources of microplastic pollution in the Rouge River and Huron River
… Huron Rivers, we measured microplastic load upstream and downstream of two Southeast Michigan wastewater treatment plants: the Ann Arbor Wastewater Treatment Plant and Ypsilanti Community Utilities Authority (YCUA). Results from this study indicated that YCUA, which discharges into a small …
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Trends in stream power and erosion at a suburban stream in Western New York
Streambank erosion is a highly damaging and prevalent nonpoint source pollution that impacts water quality, flow, and ecology. Urban watersheds are particularly sensitive due to a greater proportion of directly connected impervious land cover resulting in increased runoff into streams. Climate …
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Compact, Self-Cleaning Wet Electrostatic Precipitators
… charge and pulls them toward the wires. A small stream of water flows down the wires, washing the particles into a container below—making the system self-cleaning. We tested how different design choices affect how well it works. Using salt particles about 30 nanometers in size, the system …
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Rare Earth Elements as a Tracer to Understand Sediment Fate and Transport in Small Streams
… is a major source of water quality impairment in streams, rivers and lakes in the US. However, sediment fate and transport in small streams is poorly understood. Previous attempts to characterize sediment transport often insufficiently represented the physical and chemical sediment properties and …
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Fluvial processes, beaver activity, and climate in the greater Yellowstone ecosystem and rock type control on hillslope morphology and soil development in the Sandia Mountains, New Mexico
… range of variability in beaver-influenced small stream systems of the GYE. Chapter 2 focuses on how stream discharge on small streams in the GYE has varied in the 20th century and also during severe drought during the Medieval Climatic Anomaly. Using the Palmer Drought Severity Index as a …
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Size spectra and temporal synchrony patterns in temperate and tropical river networks
… temporal and spatial distribution of biomass in stream ecosystems, we sampled benthic macroinvertebrates across a gradient of stream sizes in one tropical and one temperate river network over 4 sample periods. We conducted a size spectra analysis to quantify change occurring over time and across …
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Sediment Management for Aquatic Life Protection Under the Clean Water Act
Although sediment is a natural component of stream ecosystems, excess sediment presents a threat to natural freshwater ecosystems. Sediment management is complicated because sediment can be dissolved in the water column, suspended as particles in the water column, or rest on the bottom of the …
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Flood Processes in Semi-arid Streams: Sediment Transport, Flood Routing, and Groundwater - Surface Water Interactions
Flooding in semi-arid streams is highly variable but distinguished from its humid counterpart in terms of forcing conditions, landscape response, flood severity, and stream-aquifer connectivity. These floods have the potential for great benefit in a water-limited environment, but also great …
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A contribution to the knowledge of the odonata
… suggested that environmental conditions of the small stream were responsible for the evolution of insect flight, and that thermoregulation as well as respiration was important in the preadaptation of wings. The possibility that the five paired convex-concave vein systems each represented a …
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Hydrodynamic controls on the movement of invertebrate larvae and organic matter in small streams
… organisms and particulate organic matter in small stream ecosystems. Variation in movement-related behaviours in two rheophilous (‘flow-loving’) mayflies (Epeorus and Baetis) and two rheophobic (‘flow-avoiding’) mayflies (Ameletus and Paraleptophlebia) were compared to determine how benthic …
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Reframing the Ditch
… with visual landscape preference theory. Small stream water quality impairment is an issue found in 83% of stream headwaters in the Eastern United States. The Clean Water Act (1972), which regulates pollutant discharge into U.S. surface waters, mandates that municipalities create an …
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Establishing the Citizen Science Stream Index (CSSI) to monitor water quality in freshwaters
Streams and rivers are amongst the most endangered ecosystems in the world. Water quality is an important measure for maintaining ecosystem function. Despite several decades of the EU Nitrates and Water Framework Directives, inputs of nutrient-rich organic matter of both agricultural and municipal …
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Comparison Of Spawning Habitat And Nest Density Between Buck Darter (etheostoma Nebra) And Striped Darter (etheostoma Virgatum) Populations In The Cumberland River Drainage, Kentucky
… Buck Darter (Etheostoma nebra) is an imperiled, small-stream species in the Cumberland River drainage in southern Kentucky. It was originally thought to be a population of the Striped Darter (E. virgatum) species and was prevalent throughout the Buck Creek system. It was separated from the …
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