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 35 for “"groundwater pollution"”.
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Response of a cave aquatic community to groundwater pollution
Density of troglobitic crustaceans and levels of potential food sources were compared in reference pools and pools disturbed by septic system effluent in Banners Corner Cave, Russell Co., Virginia. Data from six physicochemical parameters indicate slight to high disturbance in five pools in …
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Predictive Modeling of Organic Pollutant Leaching and Transport Behavior at the Lysimeter and Field Scales
Soil and groundwater pollution has become a global issue since the advent of industrialization and mechanized agriculture. Some contaminants such as PAHs may persist in the subsurface for decades and centuries. In a bid to address these issues, protection of groundwater must be based on the …
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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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Poluição de águas subterrâneas: seleção de um modelo matemático de dispersão bidimensional
An approach to the groundwater pollution may be done by a set of equations which includes two continuity equations, one for the mixture water and pollutant (flow equation) and other only for the pollutant (mass-transport equation), Darcy's equation and state equations for the mixture. Complex …
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To Assess the Level of Heavy Metal Pollution in Groundwater in Ilala Dar es salaam
… aimed at evaluating the level of heavy metal pollution in the groundwater in Ilala Dar es Salaam. The potential sources of heavy metals in Dar es Salaam city include: auto-repair shops, informal sector activity premises, small to large scale industries, on-site sanitation systems, poor solid …
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Variability Structure Estimation: The Role of Sample Support
… specific management (i.e., precision farming), groundwater and solute transport modeling, groundwater pollution assessment and remediation, etc. Due to soil heterogeneity, statistical measures are often used for variability description. The experimental point variogram and the experimental …
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Variability structure estimation: The role of sample support
… specific management (i.e., precision farming), groundwater and solute tranport modeling, groundwater pollution assessment and remediation, etc. Due to soil heterogeneity, statistical measures are often used for variability description. The experimental point variogram and the experimental …
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Properties of natural systems and the efficiency of market-based solutions to environmental externalities
… whether adopting spatially differentiated groundwater markets leads to significant savings in abatement cost while protecting nearby streams. Although the marginal damage of groundwater use on stream flows depends crucially on the location of pumping relative to streams, I find that …
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The Afterlife of Wells, from oil to soil in the Amazonia
… wells are a significant source of air, soil, and groundwater pollution. They continue to leak substances such as arsenic and methane even after they are no longer operational. It is essential to take action and responsibility for the affected people, nature, and territory. Eventually, all oil …
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Developing A GIS And Hydrological Modeling Approach For Sustainable Water Resources Management In The West Bank -- Palestine
… the Water Sustainability Map (WSM). Since the groundwater is currently the only accessible water source by the Palestinians, the WSM is represented by the Aquifer Sustainable Yield (ASY) which is equivalent to the annual renewable recharge of the various aquifer formations in the West Bank. The …
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Environmental impact assessment rectification process for Shell fuel storage tanks in Gauteng, South Africa
… product leakage; * 92% of sites do not have any pollution prevention measures; and * 87% of sites were assessed to be in the 'moderate vulnerability' category in terms of groundwater pollution analysis. Based on the findings of the study, a number of recommendations have been made to Shell, these …
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Geophysical Detection of On-site Wastewater Plumes in the North Carolina Coastal Plain, USA
Nonpoint source pollution (NPS) continues to be the leading cause of water quality degradation in the United States. On-site wastewater systems (OWS) contribute to NPS; however, due to the range of system designs and complexity of the subsurface, OWS contributions to groundwater pollution are not …
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Food waste reduction strategies for sustainable food security in Vhembe District, Limpopo Province, South Africa
… environment in terms of greenhouse emissions and groundwater pollution. Thus, this study explored both the role of religion in food conservation and the part religious leaders can play in reducing FW, while taking a fresh look at food wastage from a religious and moral perspective. In doing the …
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Changes in Soil Nitrogen Following Biosolids Application to Loblolly Pine (Pinus Taeda L.) Forest in the Virginia Piedmont
… without increasing the potential for NO₃-N groundwater pollution.
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Use of geographic information systems for assessing ground water pollution potential by pesticides in central Thailand
… technology to evaluate the vulnerability of groundwater to pesticide pollution. The study area included three provinces (namely, Kanchana Buri, Ratcha Buri, and Suphan Buri) located in the western part of central Thailand. Factors used for this purpose were soil texture, percent slope, …
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Water quality hydrology on surface mined watersheds
Water quality and discharge on four watersheds disturbed by surface coal mining at the Edna Mine in northwestern Colorado have been monito red for about three years. Water quality and discharge have also been monitored in an adjacent stream at points above and below the entrance of mine drainage …
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Surface spills at unconventional oil and gas sites: a contaminant transport modeling study for the South Platte alluvial aquifer
… or natural gas itself could potentially impact groundwater. Here, I present fate and transport simulations of aqueous fluid surface spills, the most likely pathway for groundwater contamination during oil and gas production operations, with four primary goals: (1) to evaluate whether or not …
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Septic tank nutrients in groundwater entering Lake Sallie, Minnesota
… outwash terrain of northwestern Minnesota. Groundwater entering the lake was collected by covering 0.258 m2 of lake bed with a bottomless cylinder vented to deflated plastic bag. Inflow velocity ranged from 0.01 to 2.5 micrometers per-second along 30% of the lakeshore. Groundwater inflow …
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Hydrogeologic assessment of three solid waste disposal sites in the Brazos River alluvial deposits.
… 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. The study area is located southeast of Waco, Texas, and west of the …
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Solid phase micro extraction: an alternative technique for the determination of volatile orgnanic compounds in groundwater
… determination of volatile organic compounds in groundwater at a fraction of the equipment cost. The technique can also be used as a screening tool before the validated purge and trap methods are employed.
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