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 20 of 112 for “"groundwater contamination"”.
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Finite element analysis of groundwater contamination
… to assist in the understanding of groundwater contamination problems. It was mainly aimed at studying the extent and manner of travel of contaminants in the saturated soil of unconfined aquifers which may be pumped by of wells.
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COMBINING GEOCHEMICAL AND NUMERICAL MODELING FOR CHLORINATED SOLVENTS GROUNDWATER CONTAMINATION
… human health on a worldwide scale. Chloroethenes contamination is difficult to solve due to the different optimal redox conditions needed to obtain efficient degradation of each chloroethene. The more chlorinated ones such as tetrachloroethene (PCE) and trichloroethene (TCE) are better degraded …
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Seismic waveform tomography with multicomponent data at a groundwater contamination site
This thesis develops an SH-wave version of frequency-domain, full waveform tomography, and applies it, together with traditional acoustic waveform tomography, to a multicomponent seismic data set acquired over a shallow contaminated aquifer at Hill Air Force Base, Utah. The study combines the high …
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Potential groundwater contamination from pit latrines in Ga-Maja and Reefentse
… human excreta removal in low-income countries. Groundwater is a critical water resource in many peri-urban areas where there is no municipal water supply. Groundwater resources are commonly vulnerable to pollution from on-site sanitation practises, which may degrade their quality. Because …
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Mechanisms of groundwater contamination at a fluvial tailings site, Leadville, Colorado
Includes bibliographical references (pages 151-154).
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The isotope geochemistry of uranium: Igneous petrology, ore deposits, and groundwater contamination
… and the remediation of a uranium-contaminated groundwater system. In the latter two cases, 238U/235U is used as a tracer of uranium reduction. 238U preferentially enters the reduced (solid) U phase, thus analysis of U ores can reveal information on the development of an ore body (chapters 2 and …
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Risk assessment of groundwater contamination from hydraulic fracturing fluid spills in Pennsylvania
… Shale has fueled intense debate over the risk of groundwater contamination from hydraulic fracturing and the shale gas extraction process at large. While several notable incidents of groundwater contamination near shale gas wells have been investigated, the exact causes are uncertain and widely …
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A stochastic approach for characterizing soil and groundwater contamination at heterogeneous field sites
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1998.
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Putting Scientific Information into the Service of Environmental Justice for Residents Facing Groundwater Contamination
… decision making processes regarding local groundwater remediation, they experience procedural injustice, an aspect of EJ calling for meaningful participation. The project aims to reduce barriers to meaningful participation by improving residents’ abilities to access and use scientific …
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Putting Scientific Information into the Service of Environmental Justice for Residents Facing Groundwater Contamination
… decision making processes regarding local groundwater remediation, they experience procedural injustice, an aspect of EJ calling for meaningful participation. The project aims to reduce barriers to meaningful participation by improving residents’ abilities to access and use scientific …
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Groundwater contamination at a landfill: a case study of coastal park landfill, Cape Town
The extent of groundwater pollution from landfills varies throughout the year. Studies have shown that rainfall is the greatest contributor to nutrient pollution in groundwater. Therefore, groundwater monitoring that is based on predetermined schedules and fails to consider the effects of rainfall, …
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Spring Studies and A Decision-Making Process to Guide Groundwater Contamination Prevention in an Agricultural Karst Basin
Groundwater contamination is a potential major health and environmental issue in karst aquifers because of rapid surface water to groundwater connections and conduit-dominated flow that may allow contaminants to move great distances from their source in a very short amount of time. Agricultural …
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Investigation of the Geology and Hydrology of Stone County, Missouri to Determine the Extent of Groundwater Contamination
… geology was studied to determine the extent of groundwater contamination by sampling water from 82 springs for optical brighteners which are fluorescence dyes in detergents that are associated with groundwater contamination. Of the springs sampled with houses in their assumed recharge areas, 47 …
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Environmental screening of future gasoline additives : computational tools to estimate chemical partitioning and forecast widespread groundwater contamination
(cont.) application of Raoult's law for the same set of systems. An approach was developed which relates the empirical LSER solute polarity parameter, pi2Ĥ, to two more fundamental quantities: a polarizability term and a computed solvent accessible surface electrostatic term. Electrostatics …
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Modeling the impact of petroleum mixtures released from railroad tank car accidents on groundwater contamination and cleanup times
… migration through soil, lens formation at the groundwater surface, transportation through groundwater, and pump and treat. The model has since been redeveloped to handle mixtures. All model coding was done by Hongkyu Yoon, a previous visiting research assistant professor. He developed a new …
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Groundwater contamination by selenium, nitrate, coliform bacteria, and volatile organic compounds in the Las Vegas Valley, Nevada, shallow aquifer zone
A network of 27 shallow groundwater monitoring wells in the Las Vegas Valley, Nevada, was sampled for selenium, nitrate, coliform bacteria and 37 volatile organic compounds. A distinct pattern of elevated levels of selenium, nitrates, and chloroform was observed in the developed portions of the …
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The use of Geographic Information System (GIS) for regional scale groundwater contamination risk assessment by chlorinated solvents in the Permo-Triassic sandstone aquifer
The long term contamination of groundwater resources by dense non-aqueous phase liquids (DNAPLs) such as chlorinated solvents is an increasing problem being faced throughout the industrialised world. The transport and eventual fate of these compounds in the subsurface is controlled by the nature of …
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Dye Tracing to Delineate Drainage Basins and Determine Groundwater Sensitivity, Mammoth Cave, Kentucky; with Special Reference to Potential Groundwater Contamination from Spills Along Interstate I-65
… 560 km of surveyed cave passages. The largest groundwater basin (244 km2) found within this cave system emerges from the Turnhole Bend Spring on the Green River. During high flow conditions, water from this groundwater basin will spill over into the Echo River section of the cave. Previous …
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Use of Chemical and Isotopic Signatures to Distinguish Between Uranium Mill-Related and Naturally Occurring Groundwater Constituents at the Bluewater Disposal Site
… areas soil, stream sediments, surface water and groundwater. The Bluewater mill, a predominant mill within the GMD, disposed of tailings in unlined tailings piles causing widespread groundwater contamination. This study utilized Uranium-234/Uranium-238 (234U/238U) isotopic ratios in conjunction …
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Near-infrared reflectance soil organic matter sensor
… profitability and reducing the potential for groundwater contamination.
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