Browsing Civil and Environmental Engineering by Title
Now showing items 681-700 of 866
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A Random Forest in the Great Lakes: Exploring Nutrient Water Quality in the Laurentian Great Lakes Watersheds
(University of Waterloo, 2020-09-22)A data driven approach was used in this study to investigate the drivers of nutrient water quality across the Laurentian Great Lakes drainage basin. Monitored time series of nutrient water quality and discharge were modelled ... -
A Rapid Field Method to Estimate the Concentration of Sorbing Particulate Amendments in Soil Samples
(University of Waterloo, 2023-04-11)The immobilization of plumes of contaminants in groundwater via in-situ adsorption is an emerging remediation technology. This technology involves injecting adsorbent particles into the subsurface to form a stationary ... -
Real Time Data Acquisition and Prediction Model Comparison using Maxi Directional Drills
(University of Waterloo, 2013-09-26)Horizontal Directional Drilling (HDD) is used around the world when traditional open cut methods are not practical or impossible for installing pipelines. Maxi-sized drill rigs are the largest and most powerful directional ... -
Real Time Prediction of Traffic Speed and Travel Time Characteristics on Freeways
(University of Waterloo, 2017-01-20)Travel time is one of the important transportation performance measures, and represents the quality of service for most of the facilities. In other words, one of the essential goals of any traffic treatment is to reduce ... -
Real-time Control and Optimization of Water Supply and Distribution infrastructure
(University of Waterloo, 2017-04-28)Across North America, water supply and distribution systems (WSDs) are controlled manually by operational staff - who place a heavy reliance on their experience and judgement when rendering operational decisions. These ... -
Real-Time Vehicle Emission Estimation Using Traffic Data
(University of Waterloo, 2019-05-23)The current state of climate change should be addressed by all sectors that contribute to it. One of the major contributors is the transportation sector, which generates a quarter of greenhouse gas emissions in North ... -
Realistic expectations for the treatment of FMGP residuals by chemical oxidants
(Elsevier, 2018-12-01)Methods to remediate soil and groundwater contamination at former manufactured gas plant (FMGP) sites are scarce. The objective of this study was to investigate the ability of two chemical oxidants (persulfate and permanganate) ... -
Recent changes in patterns of western Canadian river flow and association with climatic drivers: A CROCWR component
(University of Waterloo, 2013-12-10)Climatic variability and change can have profound impacts on the hydrologic regime of a watershed, especially in regions that are particularly sensitive to changes in climate, such as the northern latitudes and alpine-fed ... -
Recognizing Structural Nonidentifiability: When Experiments Do Not Provide Information About Important Parameters and Misleading Models Can Still Have Great Fit
(Wiley, 2020-02)In the quest to model various phenomena, the foundational importance of parameter identifiability to sound statistical modeling may be less well appreciated than goodness of fit. Identifiability concerns the quality of ... -
Recoupling the Livestock Nutrient Economy: A Path forward for Water Quality Improvement
(University of Waterloo, 2019-09-23)Intensification of farming operations and increased nutrient application rates have led to higher crop yields and greater food security. At the same time, widespread use of commercial nitrogen (N) and phosphorus (P) ... -
Recycled Concrete Aggregate – A Viable Aggregate Source For Concrete Pavements
(University of Waterloo, 2010-01-06)Virgin aggregate is being used faster than it is being made available creating a foreseeable shortage in the future. Despite this trend, the availability of demolished concrete for use as recycled concrete aggregate (RCA) ... -
Recycled Concrete Aggregate: Influence of Aggregate Pre-Saturation and Curing Conditions on the Hardened Properties of Concrete
(University of Waterloo, 2014-05-13)Recycled concrete aggregate (RCA) is a construction material, which is being used in the Canadian construction industry more frequently than it was in the past. The environmental benefits associated with RCA use, such as ... -
Reduction of chlorendic acid by zero-valent iron: Kinetics, products, and pathways
(Elsevier, 2020-02-15)Chlorendic acid (CA) is a recalcitrant groundwater contaminant for which an effective treatment technology does not currently exist. In this study, a series of batch experiments were conducted to investigate the treatment ... -
Regime Shift Detection Techniques for Determining the Year of Positive 0°C Crossing in the Northern Hemisphere for Late-Winter and Spring
(University of Waterloo, 2011-12-21)The temperature of 0°C, the phase change point of water-ice, is among the most influential factors on the hydrology of the temperate regions that experience winter. Many cryospheric processes, such as snow and ice melt, ... -
Regional Frequency Analysis Estimates of Extreme Rainfall Events under Climate Change
(University of Waterloo, 2020-01-09)Extreme rainfall events have a long history of causing large economic damages in urban areas and even loss of human life. Reliable estimates of extreme rainfall intensities for different rainfall durations are essential ... -
Relating Changes in Extreme Streamflow Events to Changes in Extreme Rainfall Events in Canada
(University of Waterloo, 2016-09-28)The changes in extreme events caused by climate change are likely to have significant impacts in the future. It is expected that climate change will cause changes in rainfall intensities and magnitudes and consequently ... -
Relating Extreme Temperature and Precipitation to Improve IDF Curve Estimates for Ontario in Response to Climate Change
(University of Waterloo, 2017-09-27)Events of extreme precipitation have a huge influence on society. They cause flooding, erosion, and threaten infrastructure, transportation, and safety. Precipitation extremes have increased over the last century (Alexander ... -
Relationship between Short-Term and Long-Term Creep, and the Molecular Structure of Polyethylene
(University of Waterloo, 2009-09-02)Polyethylene has been studied from many different perspectives; a final application property perspective, in which the response of the material to loads is the topic; a micromechanical point of view, in which the macroscopic ... -
Reliability Analysis Using the Method of Multiplicative Dimensional Reduction
(University of Waterloo, 2017-04-25)Traditional engineering analyses and designs are based on deterministic input variables, and variability seen in the real world are often ignored to simplify the work. Formal reliability analyses are generally avoided by ... -
Reliability Assessment of Load Testing for Concrete Buildings
(University of Waterloo, 2015-04-24)Structural rehabilitation is regularly undertaken to diagnose and repair a building during its service life; this practice ensures that buildings operate under safe and reliable conditions. Engineers generally rely on ...