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Showing 1 to 20 of 80 for “"Hydrogeologic"”.
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Hydrogeologic Controls on Lake Level at Mountain Lake, Virginia
Mountain Lake in Giles County, Virginia, has a documented history of severe natural lake-level changes involving groundwater seepage [Jansons, 2004] that extend over the past 4200 years [Cawley, 1999], and as of December 2010 the lake was about 2% full by volume. Situated in the Valley and Ridge …
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Hydrogeologic Controls on Groundwater Quality in the West Mamprusi Area, Northern Ghana
… pose health risks. A better understanding of hydrogeologic controls on groundwater quality helps to target water treatment efforts and provide better drinking water. This study focuses on the West Mamprusi area of Northern Ghana, where geology varies from coarse- to fine-grained sedimentary …
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HYDROGEOLOGIC PROPERTY ESTIMATION IN PLATE BOUNDARY OBSERVATORY BOREHOLES USING TIDAL RESPONSE ANALYSIS
Understanding hydrogeologic properties that control fluid flow and pressure distribution is important in characterizing earthquake and deformation processes because of the influence pore pressures have on effective stress. Here, we utilize borehole pressure changes in response to Earth tides to …
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Hydrogeologic assessment of the Brazos River alluvial aquifer : Waco to Marlin, Texas.
The Brazos River alluvial aquifer is a shallow unconfined aquifer within the alluvial deposits along the Brazos River. The deposits include the floodplain and terrace material which are comprised of clay, silt, sand, and gravel. Thicknesses of the alluvial deposits range up to 80 feet. Groundwater …
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Hydrogeologic analysis of streamflow in relation to underground mining in northern West Virginia
Land subsidence, caused by longwall mining, has a negative effect on overlying watersheds. Nine streams were monitored from their headwaters to their mouths for discharge, temperature, conductivity, alluvium thickness, and alluvium sediment size. Seven streams are located over undermined longwall …
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Hydrogeologic Characterization of a discharge wetland in northeastern Grand Forks County, North Dakota
<p> Soil salinization associated with saline groundwater discharge results in decreased agricultural production in the central glacial Lake Agassiz plain of North Dakota. Saline discharge occurs in a belt of ephemeral wetlands in the lake plain. The physical and chemical hydrology of .the …
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Hydrogeologic assessment of three solid waste disposal sites in the Brazos River alluvial deposits.
The Brazos River alluvial aquifer, which is composed of floodplain and terrace deposits, is a major source of shallow groundwater for the Brazos valley in central and southeast Texas. The alluvial deposits range from 10 to 40 feet in thickness and are composed of clayey and silty sands and gravel. …
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Evaluating the effects of hydrogeologic processes on the fate of salinity and halogens in headwater catchments
… was to evaluate the effects of anthropogenic and hydrogeologic processes on the fate of salinity and halogens at the catchment scale. We focus our efforts in the East and West Branches of the Tioughnioga River Watershed in Upstate New York State (NYS), USA. Spatially and temporally resolved series …
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The Hydrogeologic effects of fly ash utilization in concrete at Coal Creek Station, Underwood, North Dakota
<p> Coal Creek Station is a two-unit 1100 megawatt electrical power plant located in southern McLean county, North Dakota. Annually, 5 million tons (4.5 million metric tons) of lignite are burned at the plant producing 550,000 tons (500,000 metric tons) of fly ash. Approximately 80,000 tons (72,624 …
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Comparisons of Hydrogeologic Modeling Methods to Define Capture Zones for Public Water Supply Wells in Northern Arkansas
<p>The usefulness, applicability, and practicality of more complex and resource consuming methods for groundwater modeling has been in question since computer based groundwater modeling was established (Anderson, 1992). In many situations, computer modeling of groundwater flow is a necessity and …
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LITHOLOGIC AND HYDROGEOLOGIC CONTROLS ON THE OCCURRENCE, TRANSPORT, AND FATE OF MTBE IN FINE GRAINED GLACIAL-LACUSTRINE SEDIMENTS
… field and laboratory analysis, the governing hydrogeologic controls on the ground water flow system were described. A model was developed to simulate the contaminant transport and compared to observed plume movement, and a heat transport model was developed for comparison with both the modeled …
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LITHOLOGIC AND HYDROGEOLOGIC CONTROLS ON THE OCCURRENCE, TRANSPORT, AND FATE OF MTBE IN FINE GRAINED GLACIAL-LACUSTRINE SEDIMENTS
… field and laboratory analysis, the governing hydrogeologic controls on the ground water flow system were described. A model was developed to simulate the contaminant transport and compared to observed plume movement, and a heat transport model was developed for comparison with both the modeled …
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AN INVESTIGATION OF HYDROGEOLOGIC, STRATIGRAPHIC, AND STRUCTURAL CONTROLS ON ACER GRANDIDENTATUM COMMUNITIES IN A KARST LANDSCAPE, OWL MOUNTAIN PROVINCE, FORT HOOD MILITARY INSTALLATION, TEXAS
… and structural controls on the hydrologic, hydrogeologic, and geomorphologic evolution of the Owl Mountain Province as expressed by mesic vegetation communities, including Pleistocene relicts <em>Acer grandidentatum</em>, within karst terrains. These systems exhibit complexly overprinted …
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Hydrogeologic Model of a Leachate Plume in an Unconfined Coastal Plain Aquifer and Chemical Transport Mechanisms of Metals and Dense Non-Aqueous Phase Liquids
<p>Groundwater contamination is of increasing environmental concern as many aquifers across the globe have experienced a decrease in water quality in recent time. The growth of the world's population over the last couple of decades has caused a dramatic increase in the rate of groundwater use. One …
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Comparison and correlation of lithostratigraphic and hydrostratigraphic units of southwest area 20, Pahute Mesa, Nevada test site
Traditionally, the boundaries of hydrogeologic units are restricted to the lithologic boundaries of the rock in which the hydrogeologic unit is recognized. This type of identification places emphasis on the composition and lithic characteristic of the unit rather than the material properties of the …
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Isotopic composition of dissolved inorganic carbon in underground mine discharges of the northern appalachian basin
… and Upper Freeport) and three different hydrogeologic settings (fully flooded, partially flooded, and free draining) were compared. Twenty mine discharges were sampled, fifteen from the Pittsburgh coal seam and five from the Upper Freeport. Sampling sites included mine portals and seeps. …
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Assessing surface and groundwater interactions between the middle Brazos River Alluvium Aquifer and the Brazos River.
… the context of historical data to better define hydrogeologic gradients, chemical composition, and flow variation in the middle segment of the BRAA. Results show a generalized hydrogeologic gradient from the BRAA to the Brazos River with temporary reversals, near the river, during periods of …
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Hydrolgeologic Groundwater Sensitivity and Vulnerability Mapping in South Central Kentucky
… which groundwater can be contaminated based on hydrogeologic characteristics. We have developed digital methods for identifying areas of varying groundwater sensitivity for a ten county area of south-central Kentucky relevant to a scale of 1: 24,000. The study area includes extensive limestone …
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