Browsing Earth and Environmental Sciences by Title
Now showing items 185-204 of 434
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Impact of Winter Soil Processes on Nutrient Leaching in Cold Region Agroecosystems
(University of Waterloo, 2021-02-25)High-latitude cold regions are warming more than twice as fast as the rest of the planet, with the greatest warming occurring during the winter. Warmer winters are associated with shorter periods of snow cover, resulting ... -
Impacts of Dredging and Brush Cutting of Paired Agricultural Drainage Ditches on GHG Emissions and Nutrient Filtration Capacity
(University of Waterloo, 2023-01-04)Agriculture provides many beneficial and essential ecosystem services. Along with these beneficial services, the conversion of natural ecosystems into heavily modified agricultural ecosystems is also a source of ... -
Impacts of Ethanol in Gasoline on Subsurface Contamination
(University of Waterloo, 2009-10-09)The increasing use of ethanol as a gasoline additive has raised concerns over the potential impacts ethanol might have on groundwater contamination. In North America, 10% ethanol is commonly being added to gasoline (termed ... -
Impactus Finiens Orbem Terrarum: An Updated Risk Assessment of World Ending Asteroid Impacts
(University of Waterloo, 2011-12-01)As technology develops, the rate of discovering and observing space tends to relatively increase. Our understanding of how the Universe works, and how the planets interact with one another make us weary of what is to come. ... -
The Importance of Fracture Geometry and Matrix Data on Transient Hydraulic Tomography in Fractured Rocks: Analyses of Synthetic and Laboratory Rock Block Experiments
(University of Waterloo, 2020-05-15)The accurate characterization of hydraulic properties within fractured geologic media as well as the imaging of fracture patterns and their connectivity have been difficult to accomplish over the last few decades. Recently, ... -
Improving the efficiency of Monte Carlo Bayesian calibration of hydrologic models via model pre-emption
(International Water Association, 2015-09-01)Bayesian inference via Markov Chain Monte Carlo (MCMC) sampling and sequential Monte Carlo (SMC) sampling are popular methods for uncertainty analysis in hydrological modelling. However, application of these methodologies ... -
In situ Chemical Oxidation of Creosote/Coal Tar Residuals: Experimental and Numerical Investigation
(University of Waterloo, 2004)Coal tar, coal tar creosote and oily wastes are often present as subsurface contaminants that may migrate below the water table, leaving a widely distributed residual source of contaminants leaching to the ground water. ... -
In situ chemical oxidation using unactivated sodium persulphate at a former fuel storage facility
(University of Waterloo, 2011-06-21)Petroleum hydrocarbon (PHC) contamination poses a serious threat to aquifer systems worldwide. Accidental releases of PHCs due to gasoline spills and leakage from underground storage tanks can often result in PHC subsurface ... -
In situ Chemical Oxidation using Unactivated Sodium Persulphate at a Former Gasoline Station
(University of Waterloo, 2011-08-09)The contamination of aquifer systems by petroleum hydrocarbons is a global problem. Underground storage tanks used for storing these hydrocarbons often leak, resulting in subsurface contamination. The hazards associated ... -
In-Situ Chemical Oxidation of Oil Sands Process Affected Groundwater
(University of Waterloo, 2014-12-01)Development of oil sands mining in Athabasca basin, NE Alberta has resulted in generation of more than 1 × 109 m3 of oil sands process-affected water (OSPW) mixed with fine tailings and currently stored in about 182 km2 ... -
Incorporating Advanced Surface and Subsurface Processes in Mesoscale Climate Models
(University of Waterloo, 2016-09-26)Regional anthropogenic climate change poses significant risks to the security of water resources for communities throughout the world. Current climate simulations seek to predict the risks to water resources by employing ... -
Influence of a dammed reservoir on nutrient (N, P, Si) loads and ratios of the Thames River, Ontario
(University of Waterloo, 2021-01-20)The increasing frequency and severity of harmful algal blooms (HABs) in Lake Erie have been troubling developments in the past few decades. Excess loads of phosphorus (P) from the watershed are considered to be a primary ... -
Influence of Dynamic River Stage on The Vulnerability of Water Wells and Structure Foundations in Cold Regions
(University of Waterloo, 2023-07-12)Groundwater is important for people in Northern Canada, yet the groundwater protection protocols and water well vulnerability assessments designed for other warmer regions of Canada may not be applicable to communities ... -
Influence of Freeze-Thaw Dynamics and Spatial Contributions on Geochemical Loading from a Low Sulfide Waste-Rock Pile
(University of Waterloo, 2014-06-18)An experimental waste-rock pile (50m x 60m x 15m, 0.053 wt. % S) was constructed at the Diavik Diamond Mine, in the Northwest Territories, Canada to evaluate the generation of acid-rock drainage and the seasonal and annual ... -
The influence of soil moisture, oxygen, and temperature on naphthalene biodegradation and CO2 and CH4 effluxes
(University of Waterloo, 2023-09-22)Petroleum hydrocarbons (PHCs) are essential to the functioning of the industrialized world yet serve a potential threat to human and ecosystem health when they inadvertently enter the environment. In recent decades, ... -
Influence of Sulphide on the Degradation Pathways for Chlorinated Ethenes
(University of Waterloo, 2007-05-22)Although iron-based permeable reactive barriers are gaining importance in the treatment of groundwater contaminants, there have been field observations indicating that sulphide may affect the degradation rates of certain ... -
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 ...