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.
Results
Showing 1 to 20 of 53 for “"specific conductance"”.
-
Temporal Dynamics of Benthic Macroinvertebrate Communities and Their Response to Elevated Specific Conductance in Headwater Streams of the Appalachian Coalfields
… Appalachian coal mining often causes elevated specific conductance (SC) in streams, and others have examined SC effects on benthic macroinvertebrate communities using point-in-time SC measurements. However, both SC and benthic macroinvertebrate communities exhibit temporal variation. Twelve …
-
Delineating Wastewater Contaminant Plumes from On-Site Wastewater Treatment Systems in the North Carolina Coastal Plain using Electromagnetic Induction
… groundwater migration. In-well measurements of specific conductance, depth to the water table, pH, dissolved oxygen and temperature were used to help identify wastewater-impacted groundwater migration. Hand-auguered cores from site 100 were used to classify sediment grain size at this site and …
-
Water Quality Changes Under Ice Cover in Northern Prairie Lakes
… any ions were found in the ice of lower layers. Specific conductance increased over 40% under ice cover in two of the lakes studied. Increases in other lakes ranged from 19 to 38%. Major ions showed increases similar to specific conductance in all but one of the lakes. Most dissolved materials …
-
Land Cover and Culvert Effects on Stream Physical Water Quality in West Central Georgia
… land cover on turbidity, dissolved oxygen, pH, specific conductance, and temperature across 24 independent subwatersheds in Muscogee County, Georgia which is located in Southwest Central Georgia, according to the Georgia Department of Economic Development. To account for seasonal variability in …
-
A Biogeographic Inventory and Water Quality Analysis of the Upper Drainage Basin of the Meramec River, Missouri
… such as dissolved oxygen, total hardness, specific conductance, pH, alkalinity, and temperature were analyzed. Bacteria parameters analyzed were fecal coliform and fecal streptococcus which live in human and animal waste. A regression analysis was performed to identify correlation between …
-
Changes in Water Quality as Related to Retention Time Within Red Rock Reservoir, Iowa, Summer 1972
… and 7.0 meters with temperature data recorded. Specific conductance, pH, dissolved carbon dioxide, dissolved oxygen and alkalinity were determined in the field. Samples were refrigerated and returned to the laboratory for the determination of nitrates, phosphates and sulfates. Findings. Weak …
-
Levels of Dissolved Solids Associated with Aquatic Life Effects in Headwater Streams of Virginia's Central Appalachian Coalfield Region
… against log-transformed measures of TDS, specific conductance, and sulfate (SO42-) using ordinary least squares and quantile regression techniques. Biological effects, as defined by VASCI scores indicating stressed or severely stressed conditions, were observed with increasing probability …
-
Evaluation of the Effects of Mining Related Contaminants on Freshwater Mussels (Bivalvia: Unionidae) in the Powell River of Virginia and Tennessee
… related to mining on mussel survival and growth. Specific conductance was elevated throughout the Powell River, where site means ranged from 450 to 900 µS/cm. While mortality was high at all eight sites it was not significantly different among these sites (p>0.28); however, growth of juvenile …
-
Variations of Physical and Chemical Parameters Within a Shallow Wind Influenced Lake
… for temperature, light penetration, turbidity, specific conductance, oxygen, alkalinity, hardness, nitrate, nitrite, ortho-phosphate, and pH. Chemical tests were performed with a Hach DrEL (Engineers Portable Water Testing Laboratory). Findings. The lake was found to have no pronounced thermal …
-
Benthic macroinvertebrate community structure responses to multiple stressors in mining-influenced streams of central Appalachia USA
… to elevated salinity. I analyzed BMC structure, specific conductance (SC, surrogate measure of salinity), and habitat-feature data collected from 15 streams, each visited multiple times during 2013-2014. BMC structure changed across seasonal samples. Total benthic macroinvertebrate densities did …
-
Using Electrical Resistivity Imaging to Relate Surface Coal Mining Valley Fill Characteristics to Effluent Stream Quality
… solids (TDS), as measured by its surrogate specific conductance (SC), is a significant water quality concern related to the exposure of fresh mineral surfaces to weathering in valley fills. Specific conductance levels in waters draining Appalachian mined areas are highly variable, yet the …
-
Assessment of Aquatic Invertebrate Communities of Tributaries of the Buffalo River, Arkansas, and Evaluation of Indices of Community Integrity
… factors of the composition, vegetation, specific conductance, and nitrogen levels. It was more consistent in detecting changes in impairment over time at one year and ten year intervals of available data. Similarity among invertebrate distributions generally reflects the BRICI impairment …
-
Water Quality and Urbanization: a Multitemporal Study of the Pierson Creek Drainage Basin, Greene County, Missouri
… in order to calculate amounts of urbanization at specific times and places. The results of both biological and chemical tests of water quality were compared with urbanizatiaon upstream of each test site at the time of the tests. Three of the four biological indications of water quality yielded …
-
Vadose Zone Hydrology near the Vicinity of Edna's Dome, Mammoth Cave, Kentucky
… water to rock contact and the FF site does not. Specific conductance (SpC) data consistently suggest that the water apparently does indeed have a greater degree of water to rock contact when compared to the FF site as the pH and SpC values for the site always revealed a higher concurrent reading. …
-
Limnology of Selected South Dakota Lakes
… were basic ranging from a pH of 7.1 to 11.3. Specific conductance of lakes occupying open basins was lowest in the un-glaciated area west of the Missouri River (70-590 micromhos at 25 C) and highest in Mankato drift of the Wisconsin ice age (330-1260 micromhos at 25 C). concentrations of major …
-
Storm Response and Water Balance of Temperate Rainforest Karst Watersheds: Tongass National Forest, Alaska
… runoff, as evidenced by the quick decrease in specific conductance. This could result in a quick transmission of sediment and contaminants through the karst system into downstream salmon habitat.
-
A productivity study on Smith Mountain Lake
… included oxygen, temperature, algae, bacteria, specific conductance, light and primary productivity. The effect of each of these parameters on the trophic levels in the reservoirs was studied. The results of this investigation showed that the inflow of the nutrient rich Roanoke River had caused …
-
Temporal and longitudinal extent of surface coal mining influences on water quality and benthic macroinvertebrate communities in central Appalachian headwater streams
… research need, I analyzed temporal trends in specific conductance, ion matrix, and benthic macroinvertebrate communities in 24 headwater streams, including 19 influenced by surface mining, from 2011-2019. There was limited evidence of recovery of water chemistry or macroinvertebrate …
-
Lessons to learn from all out invasion: life history of brown trout (Salmo trutta) in a Patagonian River
… were narrower, and exhibited higher levels of specific conductance and soluble reactive phosphorous than those supporting both resident and anadromous fish. Resident sites additionally exhibited vastly higher invertebrate biomass. Significantly larger scale radii, suggesting faster juvenile …
-
Lessons to learn from all out invasion: life history of brown trout (Salmo trutta) in a Patagonian River
… were narrower, and exhibited higher levels of specific conductance and soluble reactive phosphorous than those supporting both resident and anadromous fish. Resident sites additionally exhibited vastly higher invertebrate biomass. Significantly larger scale radii, suggesting faster juvenile …
Page 1 of 3