Browsing Earth and Environmental Sciences by Issue Date
Now showing items 41-60 of 431
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Macropore flow and transport dynamics in partially saturated low permeability soils
(University of Waterloo, 2007-12-11)Near-surface sediments play an important role in governing the movement of water and contaminants from the land surface through the vadose zone to groundwater. Generally, low permeability surficial soils restrict water ... -
Effect of ethanol on BTEX biodegradation in aerobic aquifer systems
(University of Waterloo, 2008-01-04)Ethanol can affect the biodegradation of gasoline hydrocarbons in groundwater. High concentrations of ethanol can be toxic to subsurface microorganisms that are otherwise capable of degrading hydrocarbons, such as benzene, ... -
Hydrogeologic Modelling to Assess Conditions Related to OPG's Proposed Deep Geologic Repository in Tiverton, Ontario
(University of Waterloo, 2008-01-17)A Deep Geologic Repository (DGR) for Low and Intermediate Level (L&IL) Radioactive Waste has been proposed by Ontario Power Generation for the Bruce Nuclear site in Ontario Canada. The DGR is to be constructed at a depth ... -
Some Aspects of Arsenic and Antimony Geochemistry in High Temperature Granitic Melt – Aqueous Fluid System and in Low Temperature Permeable Reactive Barrier – Groundwater System
(University of Waterloo, 2008-02-11)Arsenic and antimony are important trace elements in magmatic-hydrothermal systems, geothermal systems and epithermal deposits, but their partitioning behavior between melt and aqueous fluid is not well understood. The ... -
The Design Of An Out-Diffusion Experiment And The Use Of Geochemical Analyses For The Purpose Of Matrix Pore Fluid Extraction And Characterization: A Case Study For Radioactive Waste Disposal
(University of Waterloo, 2008-04-30)Deep crystalline rock formations of low permeability have been identified as a possible geological medium for high-level radioactive waste disposal. In order for the safe disposal of radioactive waste, a site characterization ... -
Bench Scale Performance of Partitioning Electron Donors for TCE DNAPL Bioremediation
(University of Waterloo, 2008-05-08)Prior to the implementation of an enhanced bioremediation pilot study for a trichloroethene (TCE) source area at an industrial site in the United Kingdom (the Site), laboratory microcosm and column studies were performed. ... -
Geology, geochemistry and Cr-Ni-Cu-PGE mineralization of the Bird River sill: Evidence for a multiple intrusion model
(University of Waterloo, 2008-05-09)The Bird River sill (BRS) is composed of layered mafic-ultramafic intrusive bodies which intruded the Bird River greenstone belt in southeastern Manitoba. Layered intrusions, such as those that collectively make-up the ... -
Advances in Rock Core VOC Analyses for High Resolution Characterization of Chlorinated Solvent Contamination in a Dolostone Aquifer
(University of Waterloo, 2008-05-14)The current understanding of contaminant migration in fractured sedimentary rock aquifers is inadequate due to the difficulty in describing the geologic and hydrogeologic controls on contaminant fate and transport with ... -
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). ... -
A Rock Borehole Packer System for Identifying Hydraulically Active Fractures Under Natural Gradient Flow
(University of Waterloo, 2008-05-27)To improve capabilities for understanding and predicting contaminant migration in fractured rock there is need for better field methods to identify the fractures that have active groundwater flow. Current methods have ... -
Structural and geologic controls on gigantic (>1 Gm³) landslides in carbonate sequences: case studies from the Zagros Mountains, Iran and Rocky Mountains, Canada
(University of Waterloo, 2008-05-27)Two gigantic landslides in carbonate sequences were studied through a combination of remotely sensed datasets and detailed field investigation. Field investigations supplemented the remote analysis at both sites. The ... -
Quantification of the Long-Term Effects from Nutrient Reductions on Groundwater Nitrate Concentrations in an Agricultural Setting
(University of Waterloo, 2008-06-06)The Ontario Nutrient Management Act (2002) recommends agricultural Beneficial Management Practices (BMPs) that involve reductions in nutrient applications of nitrogen (N) to fields to improve underlying groundwater quality, ... -
ON THE IMPLICATIONS OF VARIOUS APPROACHES TO GROUNDWATER SOURCE PROTECTION
(University of Waterloo, 2008-06-22)Protection of groundwater sources has become an important issue in Canada. Over the last decade many approaches to the protection of groundwater sources have evolved. Some approaches provide qualitative information while ... -
Reconstruction of Paleoclimate Time-Series in the Peace-Athabasca Delta, Northern Alberta, from Stable Isotopes in Tree-Rings
(University of Waterloo, 2008-08-12)The isotopic labelling of carbon in tree-rings varies as a function of growth season temperature and relative humidity. The isotopic labelling of oxygen in tree-rings varies as a function of source-water isotopic composition ... -
Geotechnics and hydrology of landslides in Thompson River Valley, near Ashcroft, British Columbia
(University of Waterloo, 2008-08-21)Landslides in Pleistocene sediments along the Thompson River, south of Ashcroft, British Columbia have been known since before the Canadian Pacific (CP) railway was built through the valley in the 1880s. The Canadian ... -
NO3- and N2O at the Strawberry Creek Catchment: tracing sources and processes using stable isotopes
(University of Waterloo, 2008-08-26)Nitrate (NO3) contamination in agricultural watersheds is a widespread problem that threatens local drinking supplies and downstream ecology. Dual isotopes of NO3- (d15N and d18O) have been successfully used to identify ... -
Developing and refining the use of water isotope tracer in hydrology and paleohydrology
(University of Waterloo, 2008-08-27)This thesis investigates stable isotope signals (i.e. δ18O and δ2H) in various information carriers such as lake water and lacustrine sediments, aiming to develop and refine the use of isotope tracers in hydrology and ... -
Behaviour of Pharmaceutically Active Compounds in contact with Reactive Media in Simulated Ground Water
(University of Waterloo, 2008-09-03)Water treatment approaches for pharmaceutically active compounds (PhACs) are restricted by the chemically-variable nature of the PhACs themselves, each successful in treating only a small number; or the adaptability or ... -
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 ... -
Colloid transport through basic oxygen furnace slag as permeable treatment media for pathogen removal
(University of Waterloo, 2008-09-26)Basic oxygen furnace (BOF) slag media were studied through a series of laboratory, modeling and field studies as a potential treatment material for use in on site wastewater disposal systems. Microsphere enumeration ...