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 10 of 10 for “"Bedrock Aquifer"”.
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Using Ground Penetrating Radar Signal Reflection to Model a Highly Transmissive Bedrock Aquifer
… the distribution of hydraulic properties of the aquifer. As the complexity of this distribution increases, a more sophisticated understanding is required. Modeling contaminant transport in bedrock aquifers requires that the spatial distributions of highly conductive geologic features are …
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Characterization of prokaryotic diversity in a chlorinated solvent-contaminated bedrock aquifer using denaturing gradient gel electrophoresis, ribosomal DNA sequencing, and real time PCR
… abundance in a chlorinated solvent-contaminated bedrock aquifer. Core and groundwater samples were collected from several boreholes and included the following samples: (1) groundwater that was associated with the core, (2) open fractures and (3) partially mineralized sealed fractures (PMSF) …
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Nitrate and Ammonium Transformation and Fate in Groundwater of an Agricultural Watershed: An Isotope and Geochemistry Approach
… an estimate of recharge and mass loading to the aquifer. The significance of direct infiltration through cultivated corridors where corn is grown (C4 vegetation), versus naturally forested C3 vegetation, which is predominant in the headwater environment, delta 13C analysis of DIC and DOC were …
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Hydrogeology and hydrogeochemistry of the Spring Mountains, Clark County, Nevada
… suggest ground water from the Spring Mountain bedrock aquifer and alluvial-fan aquifers are mixing with water from the regional aquifer in the Las Vegas shear zone. Modeling also suggests mixing of 90 percent Las Vegas shear zone water with 10 percent water from the western portion of the Las …
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Processes Governing Rapid Recharge Events in a Shallow Fractured Rock Aquifer Having Minimal Overburden Cover
… of overburden cover on controlling recharge to a bedrock aquifer, specifically focusing on rapid recharge events. Rapid recharge events have been observed in a fractured rock site in eastern Ontario and fractured rock sites around the world. The mechanisms that cause these events are poorly …
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Aquifer Characterization in the Blue Ridge Physiographic Province
… and porous regolith with a water-table aquifer that slowly supplies 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 …
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Hydrogeological and hydrogeochemical evaluation of a proposed flue gas cleanup dry waste disposal pit near Beulah, North Dakota
… west-northwest. Two hydrogeologic units exist, a bedrock flow system and a glacial fill local flow system superimposed on the bedrock system. Water levels range from about 590 to 565 metres msl in the bedrock sediments and from 600 to 575 metres msl in the glacial fill sediments.</p> <p>Background …
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Characterization of a hydraulically induced bedrock fracture
… for many years to increase the permeability of aquifers used for drinking and irrigation water 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 …
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Measuring groundwater flow system variability in a fractured carbonate aquifer using fibre optic distributed temperature sensing
… of groundwater flow through a complex carbonate aquifer and identify how this variability relates to the local flow system. To accomplish this, innovative field methods were applied at a research site in Guelph, Ontario with nine closely-spaced boreholes spanning the full thickness of an …
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Modeling the Impacts of Land Use Activities on the Subsurface Flow Regime of the Upper Roanoke River Watershed
… 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 divided …