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Showing 1 to 13 of 13 for “"Fractured Bedrock"”.
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Some contributions to the hydraulic characterization of fractured bedrock formations
… field site, research has led to developments in bedrock monitoring, groundwater sampling, formation hydraulic testing, and the conceptual model of formation hydraulics. This dissertation presents a field device, two hydraulic test methods, and one method of hydraulic test analysis developed to …
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Simulating Remediation of Trichloroethylene in Fractured Bedrock by Thermal Conductive Heating Using the Numerical Model TMVOC
… three-dimensional heterogenous porous media or fractured rock. The 2D model was used as a screening model to investigate TCE removal from the rock matrix when heating for 100 days with a similar heating pattern to what was employed at the NAWC site. The numerical domain incorporated three …
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A statistical approach to understanding microcosm methods for microbially mediated dechlorination of trichloroethene in bedrock aquifers
… dechlorination of trichloroethene (TCE) in fractured rock aquifers. Microcosms constructed with unincubated crushed rock in groundwater provided the best microcosm model of in situ TCE degradation, when prepared and incubated to simulate the in situ environment. Microcosms constructed with …
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Aquifer Characterization in the Blue Ridge Physiographic Province
… water downward to the underlying variably fractured crystalline bedrock. In these models, interconnected fractures in the crystalline bedrock act as conduits for predominantly downward vertical and limited horizontal flow. Fracture density is depthà limited and correlated with proximity to …
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Experimental and theoretical modeling of DNAPL transport in vertical fractured media
… of complex subsurface formations, such as fractured bedrock. This work has developed a new model describing DNAPL infiltration into a water- saturated, vertical fracture idealized as a circular section capillary tube. A series of laboratory and geotechnical centrifuge experiments of DNAPL …
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Spatial Relationship between the Trichloroethylene Degrading Bacteria Dehalococcoides Sp., Sulfate Reducers and Archaea during Reductive Dechlorination
… different aquifer types such as sandy, silty and fractured bedrock aquifers (hereafter type 1, 2 or 3 reactors, respectively). This study evaluated the effect of TCE concentration in different types of reactors on the distribution of selected microorganisms with distance from the source of the …
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Velocity and celerity in a forested headwater catchment : a combined experimental and modelling approach
… a forested headwater catchment characterised by fractured bedrock. Our field experiments proved the importance of bedrock cleavage orientation in controlling subsurface flow direction and demonstrated the importance of quantifying the extent of fractures as well as their orientation relative to …
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Analytical and Numerical Modelling of Thermal Conductive Heating in Fractured Rock
… site remediation. Modelling was conducted in a fractured bedrock environment containing a system of parallel, equally-spaced horizontal fractures. A semi-analytical solution to the two-dimensional heat conduction equation was developed and used to study temperature distributions between two …
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The effect of biostimulation on geochemical and microbiological conditions in an isolated dolostone fracture
… nutrient addition on microbial populations in a fractured rock environment. The ultimate goal of this research is to induce bioclogging in rock fractures as a method of in situ containment and remediation of contaminated groundwater. This trial focused on biostimulation of indigenous bacteria in …
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In Situ Compressional Wave Velocity Across An Exposed Brittle Fault Zone
… are bordered on either side by 30-40 m wide fractured zones. Resolving to a scale of a few meters, the seismic survey produced a continuous P-wave velocity profile analogous to a horizontal well log across the fault. Lateral variations in the velocity profile correlate exactly to previously …
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Modeling the Impacts of Land Use Activities on the Subsurface Flow Regime of the Upper Roanoke River Watershed
… conceptualization of the flow system. The fractured bedrock aquifer system consists of three sloping geohydrologic units: the Ordovician to Mississippian clastics, the Cambrian and Ordovician carbonates, and the Precambrian and Cambrian metamorphics and clastics. The 575 mi² study area was …
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Characterization of a hydraulically induced bedrock fracture
… supply. This process extends and widens existing bedrock fractures, allowing groundwater storage to increase. Researchers have studied the behavior of fractured-rock aquifers for decades, but little has been published on the hydraulic and mechanical properties of hydraulically enhanced fractures. …
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Earthquake-induced landsliding
… hillslopes, leading to large amounts of soil and bedrock moving downslope. Moreover, static deformation and shaking are suspected to damage the surface bedrock and therefore alter its future properties, affecting hydrological and erosional dynamics. Thus, earthquakes participate both in mountain …