Browsing Civil and Environmental Engineering by Title
Now showing items 687-706 of 881
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Quantifying the Impact of Transit Rider Perception and Satisfaction on User Cost: An Experiential Sampling Approach Using Smartphones
(University of Waterloo, 2018-03-15)The aim of travel demand modelling is to accurately estimate trips in future time periods by understanding current travel behaviours. Accurate generalized cost modelling for determining transit mode share has proven elusive. ... -
Quantifying the Mobility Benefits of Winter Road Maintenance – A Simulation Based Approach
(University of Waterloo, 2009-04-30)A good understanding of the relationship between highway performance, such as crash rates and travel delays, and winter road maintenance activities under different winter weather and traffic conditions is essential to ... -
Quantifying the Technical Efficiency of Canadian Paratransit Systems Using Data Envelopment Analysis Method
(University of Waterloo, 2005)Paratransit service operators in Canada are under increasing pressure to improve the operational productivity of their services due to increased demand and tightening financial constraints. To achieve this, Paratransit ... -
Quantitative Structure-Property Relationships Modeling of Rate Constants of Selected Micropollutants in Drinking Water Treatment Using Ozonation and UV/H2O2
(University of Waterloo, 2012-05-23)Concern over the occurrence of micropollutants in drinking water and their health effects is increasing. Therefore, there is a growing interest in understanding micropollutant removal during drinking water treatment. ... -
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 Traffic Performance Measurement of Signalized Intersections Using Connected Vehicle Data: A Simulation-Based Study
(University of Waterloo, 2023-12-05)Traffic congestion has long become a major concern in many cities in Canada and around the world. It has been estimated that the annual total economic loss due to traffic congestion in major Canadian urban centers has ... -
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 ...