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Showing 1 to 20 of 49 for “"Roanoke River"”.
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A productivity study of the Roanoke River above Niagra Dam
… of the water quality in the upper end of the Roanoke River arm of Smith Mountain Lake due to eutrophication has caused much concern. The Smith Mountain impoundment was built in 1965 as a pump storage facility to generate electric power, and the lake serves as a major recreational area for …
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Assessing the geologic sources of manganese in the Roanoke River watershed
… have been measured in groundwater within the Roanoke River watershed, Virginia. Concentrations of Mn often exceed the secondary drinking water standard. A historic belt of Mn ores, the James River-Roanoke River Manganese District (JRRRMD), occurs in the eastern part of the watershed. The …
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Factors Influencing Darter Dispersal Patterns in the Upper Roanoke River Watershed, Virginia
… study of three darter species in the upper Roanoke River watershed. Logistic regression was used to relate observed inter-riffle movements to gradients in riffle and corridor attributes. During the first study period, habitat area loss and habitat spacing drove dispersal patterns. However, a …
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Distributed Hydrologic Modeling of the Upper Roanoke River Watershed using GIS and NEXRAD
… grid based hydrologic runoff model to the Upper Roanoke River watershed (1480km2) to investigate the effects of precipitation resolution and grid cell size on modeled peak flow, time to peak and runoff volume. The gridded NRCS curve number (CN) rainfall excess determination and ModClark runoff …
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The geology of the upper Roanoke River Valley area, Montgomery and Roanoke counties, Virginia
The upper Roanoke River Valley area lies in the Valley of Virginia in Montgomery and Roanoke counties, and is about 100 square miles in area. All but the oldest of the mapped units shown on Plate l are of Paleozoic age and of sedimentary origin. The Precambrian rocks that crop out on Poor Mountain …
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Influence of geology on the water resources of the Upper Roanoke River Basin, Virginia
The Upper Roanoke River Basin contains Precambrian Blue Ridge Complex rocks and 15,000 feet of Paleozoic sedimentary rocks in a complexly folded and faulted structural framework. Three geohydrologic units were identified--Precambrian and Ordovician metamorphics and elastics, Cambrian and Ordovician …
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Habitat tools for assessing instream-flow needs for fishes in the upper Roanoke River, Virginia
… habitat and fish data sets for the upper Roanoke River (URR) in southwestern Virginia, collected during the warmer, low- f low seasons of 1989-1991. Physical data were collected in small, rectangular quadrats or crosssectional transacts, whereas fish were collected by seining and …
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Effects of Watershed and Habitat Conditions on Stream Fishes in the Upper Roanoke River Watershed, Virginia
… habitat data at 43 sites throughout the upper Roanoke River watershed, Virginia. Sites were separated into three watershed areas size classes: 10 - 15, 20 - 30, and 70 - 80 km². I correlated physical in-stream conditions with proportions of forest, disturbed, and herbaceous/agricultural land at …
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Middle Ordovician limestones in the valley of the North Fork of the Roanoke River, Montgomery County, Virginia
… Study of the area in the North Fork of the Roanoke River was begun in the fall of 1950 and the work was continued in the summer of 1951. The lithologic divisions of the Middle Ordovician limestones was mapped. The 15-minute Blacksburg quadrangle was used es a base map with a modified scale …
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Population Ecology and Foraging Behavior of Breeding Birds in Bottomland Hardwood Forests of the Lower Roanoke River
… in bottomland hardwood forests of the lower Roanoke River, North Carolina. Nesting success was monitored in two forest width classes: narrow bands of levee forest that were dominated by two edge types, and wide, continuous levee forest stands that have edges but most forest is relatively far …
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Sources and yields of nutrient and organic loadings in the Roanoke River Basin above Smith Mountain Lake, Virginia
… of nutrient and organic loadings in the Upper Roanoke River Basin were investigated during the summer low flow period of 1971. Parameters monitored at sampling stations in the basin included biochemical oxygen demand, chemical oxygen demand, total organic carbon, total phosphate, …
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Modeling the Impacts of Land Use Activities on the Subsurface Flow Regime of the Upper Roanoke River Watershed
… on the subsurface flow regime in the Upper Roanoke River Watershed in Virginia to determine the impacts of land use change on the subsurface flow system, and to provide a tool for future management decisions. Land use activities can impact the groundwater system in two ways. The volume of …
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Two races of Etheostoma flabellare flabellare Rafinesque from the Roanoke River of Virginia and the Neuse River of North Carolina
… flabellare flabellare Rafinesque, one from the Roanoke River of Virginia and the other from the Neuse River of North Carolina. They are compared in twenty-three characters (scalation, ray counts, and color marks). For eight characters, the Roanoke sample has been divided into its component …
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Campostoma anomalum Roanokense, a new subspecies of the stoneroller minnow in the James and Roanoke rivers
Campostoma anomalum roanokense, a new subspecies of C. anomalum in the James and Roanoke Rivers of Virginia, West Virginia, and North Carolina is compared to C. a. kanawhanum, the most closely related form, and to other similar forms. Three races of C. a. roanokense: a. South Fork Roanoke River …
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Patterns in Fish Community Structure in a Regulated River
… distribution of fish communities in the lower Roanoke River, a hydropeaking system in North Carolina. Fishes were sampled at before and after peaking events over three years; 2007 to 2009. I evaluated trends in species richness, diversity, and assemblage composition. There were no significant …
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Determination of the location of the groundwater divide and nature of groundwater flow paths within a region of active stream capture; the New River watershed
The relatively rapid stream capture of the New River basin by the Roanoke River basin provides a unique example of topographic change within a tectonically inactive environment. A previous investigation of abandoned river deposits has shown the capture of ~225 km2 of New River basin area, which has …
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Genetic Marker-Assisted Management of Virginia Sport Fishes
… Bass along the Atlantic Coast and within the Roanoke River drainage exhibit low genetic variation. Screening 12 microsatellite DNA markers across the range to define population genetic structure, I found that anadromous populations in the Southeast and the Chesapeake Bay were differentiated …
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Use of the Immune System to Investigate the Toxicity Induced by Environmental Pollutants in Fish, Amphibian, and Mammalian Species
… toxicity assay. Fish from various streams of the Roanoke River were tested for immunotoxicity and parasitic infection. Fish from the more polluted North Fork of the Roanoke River exhibited a stronger mitogenic response when compared to fish from the South Fork of the Roanoke River. The effect of …
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