Browsing Earth and Environmental Sciences by Subject "Earth Sciences"
Now showing items 41-60 of 186
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The Effectiveness of Persulfate in the Oxidation of Petroleum Contaminants in Saline Environment at Elevated Groundwater Temperature
(University of Waterloo, 2011-12-08)In the past few decades, several aqueous oxidants have been employed (e.g., permanganate, persulfate) to remediate petroleum hydrocarbons. However, the majority of the research in this field has been focused primarily on ... -
The Effects of Entrapped Gas Bubbles on Physical Flow and Dissolved Gas Transport - A Sand Tank Experiment
(University of Waterloo, 2014-09-08)Groundwater tables undergo natural fluctuations due to a variety of processes like snow melt, rain infiltration, aquifer recharge/discharge and river stage fluctuations. Water-table fluctuations result in the entrapment ... -
Effects of fluorine on the solubilities of Nb, Ta, Zr and Hf minerals in highly fluxed water-saturated haplogranitic melts
(University of Waterloo, 2012-11-01)The effect of fluorine on the solubilities of Mn-columbite (MnNb2O6), Mn-tantalite (MnTa2O6), zircon (ZrSiO4) and hafnon (HfSiO4) were determined in highly fluxed, water-saturated haplogranitic melts at 800 to 1000 °C and ... -
Errors in mixed layer heights over North America: a multi-model comparison
(University of Waterloo, 2011-05-20)Vertical mixing is an important process that relates surface fluxes to concentrations of pollutants and other chemical species in the atmosphere. Errors in vertical mixing have been identified as a major source of uncertainties ... -
Establishing Metrics to Quantify the Vulnerability of Municipal Supply Wells to Contaminants from Surface Water Sources
(University of Waterloo, 2014-08-22)This study was completed in conjunction with the Regional Municipality of Waterloo and the Southern Ontario Water Consortium, with assistance from the Canadian Water Network and Grand River Conservation Area with the main ... -
Evaluating Innovative Nutrient Management Options and Seasonal Groundwater Recharge Dynamics in an Agricultural Source Water Protection Area
(University of Waterloo, 2012-09-28)This thesis presents two interrelated studies that consider nutrient management and seasonal changes in recharge on agricultural lands within the context of source water protection. The research focuses first on the ... -
Evaluating Regional Aquifer Vulnerability and BMP Performance in an Agricultural Environment Using a Multi-Scale Data Integration Approach
(University of Waterloo, 2009-06-19)The increased use of both organic and synthetic fertilizers on agricultural land has lead to rising groundwater nitrate concentrations in some areas of southern Ontario. This has occurred at the Thornton Well Field in ... -
Evaluating Surface Concentrations of NO2 and O3 in Urban and Rural Regions by Combining Chemistry Transport Modelling with Surface Measurements
(University of Waterloo, 2011-01-27)A base case modelling investigation was conducted to explore the chemical and physical behaviour of ground-level ozone (O3) and its precursor nitrogen dioxide (NO2) in Ontario using the U.S. Environmental Protection Agency ... -
Evaluating Vadose Zone Moisture Dynamics using Ground-Penetrating Radar
(University of Waterloo, 2012-02-27)Near-surface sediments in the vadose zone play a fundamental role in the hydrologic system. The shallow vadose zone can act as a buffer to delay or attenuate surface contaminants before they reach the water table. It also ... -
Evaluation of an Oxygen Injection Technology for In-Situ Hydrocarbon Bioremediation in a Fractured Bedrock Environment
(University of Waterloo, 2009-04-30)Oxygen has been shown to be an effective addition of enhancing the bioremediation of petroleum hydrocarbon contamination in porous media; however, the ability to effectively deliver oxygen to petroleum hydrocarbon contaminated ... -
Evaluation of Geochemical and Reactivity Changes of Different Iron Materials
(University of Waterloo, 2006)Previous studies have suggested that iron PRBs, receiving high concentrations of inorganic constituents in groundwater, may experience passivation because of the accumulation of inorganic precipitates. In an iron PRB ... -
Evaluation of Stable Chlorine and Bromine Isotopes in Sedimentary Formation Fluids
(University of Waterloo, 2008-05-21)Two new analytical methodologies were developed for chlorine and bromine stable isotope analyses of inorganic samples by Continuous-Flow Isotope Ratio Mass Spectrometry (CF-IRMS) coupled with gas chromatography (GC). ... -
Evaluation of Traditional Hydrogeologic Characterization Approaches in a Highly Heterogeneous Glaciofluvial Aquifer/Aquitard System
(University of Waterloo, 2009-05-22)The purpose of this study was to evaluate the effectiveness of traditional hydrogeologic characterization approaches in a highly heterogeneous glaciofluvial aquifer at the North Campus Research Site (NCRS), situated on the ... -
Evidence for Participation of Anammox in Nitrogen Attenuation Observed in Groundwater Impacted by a Manure Lagoon
(University of Waterloo, 2012-01-23)Decades of agricultural use of fertilizer and manure has resulted in nitrogen being the most common groundwater contaminant. Of the known processes for nitrogen attenuation, both denitrification and anammox produce a ... -
Evolution of Canadian Shield Groundwaters and Gases: Influence of Deep Permafrost
(University of Waterloo, 2008-09-24)Numerous glacial advances over the past 2 million years have covered the entire Canadian and Fennoscandian Shield outcrop. During glacial advance and retreat, permafrost is expected to form in front of the glacier. The ... -
Fate and Transport of Naphthenic Acids in Glacial Aquifers
(University of Waterloo, 2004)Naphthenic acids (NAs) are carboxylated alkanes and cycloalkanes concentrated in wastewater during oil sands processing. The general chemical formula is C{n}H{n+Z}O{2}, where n represents the number of carbon atoms and ... -
Fate of Chlorinated Compounds in a Sedimentary Fractured Rock Aquifer in South Central Wisconsin
(University of Waterloo, 2008-10-22)A study was carried out in a sedimentary fractured rock site located in south central Wisconsin, US, which was impacted by DNAPL releases estimated to occur in the 1950’s and 1960’s. The majority of the DNAPL has accumulated ... -
Field Trial of Residual LNAPL Recovery Using CO2-Supersaturated Water Injection in the Borden Aquifer
(University of Waterloo, 2007-01-24)The ability of supersaturated water injection (SWI) to recover non-aqueous phase liquids (NAPLs) was studied at the field scale as part of an ongoing program to evaluate its applicability to groundwater remediation. SWI ... -
Field-Scale Evaluation of Enhanced Agricultural Management Practices Using a Novel Unsaturated Zone Nitrate Mass Load Approach
(University of Waterloo, 2007-01-23)The monitoring of nitrate mass load through the unsaturated zone below agricultural land was proposed as a novel technique to assess the effect of agricultural best management practices (BMPs). The objectives of the study ... -
Fingerprinting Quaternary Subglacial Processes on Hall Peninsula, Baffin Island, using Multiproxy Data
(University of Waterloo, 2014-01-23)It is important to study subglacial environments in northern Canada for many reasons, such as to develop a more comprehensive understanding of glacial landscape development and to aid in mineral exploration. The purpose ...