Browsing Earth and Environmental Sciences by Title
Now showing items 261-280 of 434
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Modelling effects of stormwater best management practices on urban stormwater runoff phosphorus
(University of Waterloo, 2024-01-15)Phosphorus (P) is a key limiting nutrient for algal growth in freshwater whose excess loading to freshwater bodies contributes to cultural eutrophication and the associated symptoms of water quality deterioration. Urban ... -
Modelling Legacy Nitrogen Dynamics in the Transboundary Lake Erie Watershed
(University of Waterloo, 2023-01-26)Lake Erie is a source of drinking water, recreation, and commercial opportunity for both the United States and Canada, making the protection of its water quality essential. In the past decades, Lake Erie's ecosystems ... -
Modelling of Multistage Hydraulic Fracture Operations in Unconventional Resources – The Application of Geomechanics and Field Data to the Optimization of Fracture Spacing and Production
(University of Waterloo, 2016-06-08)Massive multistage hydraulic fracturing using horizontal wells has been an integral part of the natural resource industry in Canada. The process uses long horizontal wells divided into many stages to access large volumes ... -
Modelling the Effects of Climate Change on the Surface and Subsurface Hydrology of the Grand River Watershed
(University of Waterloo, 2010-05-06)A numerical modelling analysis of climate change’s precipitation effects on the long-term, averaged surface and subsurface hydrology of the Grand River Watershed (GRW) was undertaken in order to assess possible areas of ... -
Monitoring a Shallow Gasoline Release using GPR at CFB Borden
(University of Waterloo, 2011-10-04)This hydrogeophysical field experiment evaluated the ability of high frequency (450 & 900 MHz) ground penetrating radar (GPR) to characterize the release of gasoline over an annual cycle of in situ conditions. In August ... -
Monitoring Shallow Vadose Zone Moisture Dynamics using Electrical Resistivity Tomography and Electromagnetic Induction
(University of Waterloo, 2015-06-15)This hydrogeophysical study examines the capacity of the surface electrical resistivity tomography (ERT) and electromagnetic induction (EMI) methods to monitor soil moisture dynamics in the shallow vadose zone over the ... -
Monitoring the evolution and migration of a methane gas plume in an unconfined sandy aquifer using time-lapse GPR and ERT
(Elsevier, 2017-08-01)Fugitive methane (CH4) leakage associated with conventional and unconventional petroleum development (e.g., shale gas) may pose significant risks to shallow groundwater. While the potential threat of stray (CH4) gas in ... -
Multi-decade comparison of groundwater nitrate in the southern Nottawasaga River Watershed
(University of Waterloo, 2016-08-25)The Nottawasaga River Watershed is host to the Lake Algonquin Sand Aquifer (LASA), an unconfined aquifer that consists of glaciolacustrine sands and provides water supply to rural residents, for household use, and for ... -
A multi-isotope approach towards constraining the origin of large-scale Paleoproterozoic B-(Fe) mineralization in NE China
(Elsevier, 2017-05-01)Borate ore deposits occur predominantly in Phanerozoic evaporative sedimentary environments but are scarce in Precambrian strata. However, massive B- and Mg-rich borate deposits are abundant in the Paleoproterozoic strata ... -
Multi-Phase Multi-Component Equilibrium Flash Calculations for CompFlow Bio using Modified Volume-Translated Peng- Robinson Equation of State
(University of Waterloo, 2017-05-24)Numerical modelling of fluid flow and transport in reservoir engineering problems is a challenging task, given variability and uncertainty in the physical properties of rock, the complexities of multi-fluid interaction at ... -
A Multi-Proxy Study of Holocene Atmospheric Circulation Dynamics Recorded in Lake Sediments in Fennoscandia
(University of Waterloo, 2009-01-22)Cellulose-inferred lake water oxygen-isotope records were obtained from five throughflow lakes situated along a north-south transect across Fennoscandia to help develop a better picture of Holocene changes in atmospheric ... -
A Multi-Scale Approach in Mapping the Sedimentological and Hydrostratigraphical Features of Complex Aquifers
(University of Waterloo, 2009-12-22)Accessibility to consistent subsurface hydrostratigraphic information is crucial for the development of robust groundwater flow and contaminant transport models. However, full three-dimensional understanding of the ... -
Multiple negative molybdenum isotope excursions in the Doushantuo Formation (South China) fingerprint complex redox-related processes in the Ediacaran Nanhua Basin
(Elsevier, 2019-09-15)The Ediacaran Doushantuo Formation offers one of the most complete and extensively studied records of end- Neoproterozoic biotic and environmental change. Here, we report multiple coeval negative molybdenum (Mo) ... -
NAPL Recovery Using CO<sub>2</sub>-Supersaturated Water Injection: Distribution of the CO<sub>2</sub> Gas Phase
(University of Waterloo, 2006)Gas inFusion? is a novel remedial technology that dissolves CO<sub>2</sub> into water under pressure for NAPL recovery. As the supersaturated liquid flows through the porous medium gas evolution occurs in situ as the ... -
Natural Gradient Tracer Tests to Investigate the Fate and Migration of Oil Sands Process-Affected Water in the Wood Creek Sand Channel
(University of Waterloo, 2009-10-02)The In Situ Aquifer Test Facility (ISATF) has been established on Suncor Energy Inc’s (Suncor) oil sands mining lease north of Fort McMurray, Alberta to investigate the fate and transport of oil sands process-affected (PA) ... -
Natural Late Holocene lake level fluctuations recorded in the Ipperwash strandplain, southern Lake Huron
(University of Waterloo, 2017-09-25)The Laurentian Great Lakes (LGL) are the largest system of surface freshwater on Earth. Three factors, glacial isostatic adjustment (GIA), outlet conveyance, and climate processes contribute to natural rises and falls in ... -
Natural source zone depletion of petroleum hydrocarbons under variable temperature and moisture conditions
(University of Waterloo, 2023-02-15)In subsurface environments contaminated by petroleum hydrocarbons (PHCs), the steep geochemical and redox gradients near the water table, the oxygen availability, moisture content, salinity, pH, nutrient concentrations and ... -
New Approaches to the Collection and Interpretation of High Sensitivity Temperature Logs for Detection of Groundwater Flow in Fractured Rock
(University of Waterloo, 2012-08-20)The use of temperature logging for identifying water flow through fractures in sedimentary rock has declined since the 1960’s and 70’s primarily because of low sensor resolution and cross-connected flow along the borehole. ... -
Nickel Isotope Geochemistry in Mine Waste System
(University of Waterloo, 2021-01-13)Metal stable isotope analyses have proven to make valuable contributions to the study of the biogeochemical cycling of metals and metalloids in the environment. Processes that control the release, mobility and fate of ... -
Nitrate sources and cycling at the Turkey Lakes Watershed: A stable isotope approach
(University of Waterloo, 2004)<p class=MsoNormal><span style="mso-spacerun: yes"> </span>Stable isotopic analysis of nitrate (<sup>15</sup>N/<sup>14</sup>N and <sup>18</sup>O/<sup>16</sup>O) was used to trace nitrate sources and cycling under ...