Browsing Earth and Environmental Sciences by Title
Now showing items 201-220 of 434
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The influences of spatially variable rainfall and localized infiltration on groundwater recharge in a water management context
(University of Waterloo, 2020-10-27)Water management involves monitoring, predicting, and stewarding the quality and quantity of groundwater recharge at the watershed scale. Recharge sustains baseflow to streams and replenishes water extracted by pumping at ... -
An Integrated Approach to Paleo-Ice Stream Determination in Mid Continental Prairies, Saskatchewan, Canada
(University of Waterloo, 2009-10-02)Ice stream research has gained momentum in the last decade due to the increased need to understand ice sheet dynamics and instability and, by extension, the role ice streams have on climate change and sea level rise. ... -
Integrated hydrologic model calibration under non-stationary climates
(University of Waterloo, 2024-01-17)With global climate change, quantifying water availability for management under non-stationary conditions is, and will continue to be, a major challenge. When hydrologic models are calibrated to historic climatic conditions, ... -
Integrated Solid Phase, Aqueous Phase and Numerical Investigation of Plume Geochemistry at an Oil Sand Mining Facility
(University of Waterloo, 2006)A plume of process-affected groundwater was identified in a shallow sand aquifer adjacent to a tailings impoundment at Syncrude Canada Ltd. Quantitative and qualitative Naphthenic Acid (NA) analyses were performed on ... -
Integrating Methods for Characterizing the Passive Treatment of Mercury and Selenium in Groundwater and Sediment
(University of Waterloo, 2011-03-16)Standard geochemical analysis methods, such as aqueous geochemistry analysis and mineralogical analysis, frequently are utilized to evaluate the effectiveness of passive treatment systems, though they do not necessarily ... -
Integration of Active and Passive Sampling Techniques for Characterization of Non-point Source Contamination from Septic Systems in Rural Ontario Hamlets
(University of Waterloo, 2019-04-30)Excessive nutrient loading to surface water bodies can lead to the development of eutrophic conditions, including deterioration of water quality and ecological stability. Sources of nutrient loading include wastewater ... -
Integration of Geochemical and Isotopic Analyses of Fracture Minerals and Fluids to Assess the Deep Geological Stability at Chalk River Laboratories, Chalk River, Canada
(University of Waterloo, 2019-09-30)The crystalline bedrock underlying the Chalk River Laboratories (CRL) at Canadian Nuclear Laboratories (CNL) provides a valuable analogue for potential nuclear waste storage sites. As the main pathways for fluid flow in ... -
Integration of non-traditional stable isotopes and synchrotron measurements
(University of Waterloo, 2022-08-31)Selenium is well named after the moon, because statements about this element must often be qualified, making it feel ever changing; for instance, Se is a nutrient, but an excess of 400 µg per day is toxic for humans. High ... -
Interactions of Phosphate and Silicate with Iron oxides in Freshwater Environments
(University of Waterloo, 2019-04-29)Internal phosphorus loads, from bottom sediments to surface waters, are often comparable in magnitude to external phosphorus loads, particularly in water bodies with a history of high external phosphorus inputs from point ... -
Intermediate and Low Level Nuclear Waste Stabilisation: Carbonation of Cement-based Wasteforms
(University of Waterloo, 2003)Carbonation is a naturally-occurring process whereby Ca-containing cement phases lose their hydration water and are converted to carbonate minerals by reaction with atmospheric CO₂. As these secondary minerals ... -
Interpretation of redox potential and assessment of oxyanion (As, Sb, Cr) mobility during oxic-anoxic oscillations
(University of Waterloo, 2017-01-10)Electron transfer (redox) reactions are key processes in the biogeochemical functioning of natural systems. Redox reactions control the speciation and mobility of major elements (e.g., carbon, nitrogen, iron, and manganese) ... -
Inverse correlation between the molybdenum and uranium isotope compositions of Upper Devonian black shales caused by changes in local depositional conditions rather than global ocean redox variations
(Elsevier, 2020-10-15)Coupled Mo-U isotope data from the Upper Devonian Kettle Point Formation (Ontario, Canada) provide a cautionary tale regarding interpretation of global ocean redox conditions using data from euxinic black shales. In the ... -
Investigating new approaches for mapping groundwater systems in karstic carbonate bedrock: A case study in the Early Silurian formations of the Niagara Escarpment cuesta, southern Ontario, Canada
(University of Waterloo, 2019-03-20)The Ontario Geological Survey conducts geoscience mapping that is designed to support groundwater resource investigations across the province. Recent geological mapping in the Early Silurian carbonate bedrock in southern ... -
An Investigation into Water Consumption Data Using Parametric Probability Density Functions
(University of Waterloo, 2018-08-07)Many datasets can be expressed through the usage of frequency-based histograms that provide compact visualizations of large volumes of data. A motivating hypothesis of this work is that the relative frequency of measurements ... -
Investigation of Gas Transport Rates Through a Covered Waste Rock Pile and Synchrotron Studies on the Sulfide Oxidation Reaction
(University of Waterloo, 2017-01-19)This thesis presents a field based investigation into gas transport mechanisms and rates through a waste-rock pile with a low permeable cover, and a synchrotron based study into intermediate sulfidic species that are ... -
An Investigation of Heterogeneity and the Impact of Acidic Regions on Bulk Effluent from a Deconstructed Low Sulfide Waste-Rock Pile
(University of Waterloo, 2017-05-15)Waste rock is a potential source of low quality drainage resulting from oxidation of naturally occurring sulfide minerals. Sulfide oxidation may result in the generation of effluent with elevated concentrations of SO4 and ... -
Investigation of Pharmaceutical Compounds in Landfill and Septic System Plumes
(University of Waterloo, 2008-11-21)Two municipal landfills and one public septic system in Southern Ontario were studied as potential sources of the pharmaceuticals ibuprofen, carbamazepine, gemfibrozil, caffeine, sulfamethoxazole, and naproxen to groundwater. ... -
Investigation of the Efficacy of in situ Degradation Methods for Perfluorooctanoic Acid (PFOA) and Perfluorooctane Sulfonic Acid (PFOS) in Groundwater
(University of Waterloo, 2018-01-17)Per- and polyfluoroalkyl substances (PFASs) are a group of emerging contaminants that include perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS). PFASs can be released into groundwater through the ... -
Investigations into Cellulolysis in Carbon Amended Tailings
(University of Waterloo, 2011-05-24)Modified cellulase enzyme assay methods were developed to determine the potential of using enzyme activities to evaluate the decomposition of organic matter in carbon amended mine tailings systems. Cellulase assays are ... -
Iron isotope fractionation in sediments of an oligotrophic freshwater lake
(University of Waterloo, 2015-10-06)In situ iron (Fe) isotope compositions of pore water and solid-bound Fe phases were measured in sediments of an oligotrophic, sulfate-poor freshwater lake (Lake Tantaré, Québec, Canada). Previous work has shown that ...