Kasun N. Hewage

Kasun N. Hewage
University of British Columbia - Okanagan | UBC Okanagan · School of Engineering

PhD, PEng

About

119
Publications
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4,604
Citations

Publications

Publications (119)
Article
Bridges reinforced with superelastic shape memory alloys (SMAs) demonstrate improved performance under earthquake excita-tions. In general, the capital investment for a bridge reinforced with SMAs is higher due to their high cost and special workmanship requirement. However, when accounting for postearthquake repair and maintenance costs and enviro...
Article
Bridges are an integral part of a country's transportation infrastructure system. Earthquake-induced damages to bridges could result in fatalities and injuries, disturbances to the transportation infrastructure system, and incur significant repair costs. Furthermore, bridges must stay functional following an earthquake to maintain the continuity of...
Article
Full-text available
Simultaneous optimization of energy and water quality in real-time large-sized water distribution systems is a daunting task for water suppliers. The complexity of energy optimization increases with a large number of pipes, scheduling of several pumps, and adjustments of tanks’ water levels. Most of the simultaneous energy and water quality optimiz...
Article
More than 55% of recorded fire incidents in multi-unit residential buildings (MURBs) are induced by human error factors causing threats to the public and tremendous economic losses. This study developed a framework to quantitatively assess and predict human error factors that induce fire incidents (HEFs-FIs). The framework is based on four main ste...
Article
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The use of energy efficient building systems can play a key role in reducing energy consumption and the adverse impacts of greenhouse gas (GHG) emission. The occupancy profile of residential dwellings has a notable influence on the effectiveness of selecting appropriate energy upgrade retrofits. Building simulation models can be integrated to deter...
Article
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Several factors over the years have contributed to stigma in public transport. Many studies have highlighted the need to make the transport system more equitable both from economic and gender perspectives. This study attempts to demonstrate how the perceptions of public transport users and non-users are stigmatized from social and cultural standpoi...
Article
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Higher education institutions (HEIs) consume significant energy and water and contribute to greenhouse gas (GHG) emissions. HEIs are under pressure internally and externally to improve their overall performance on reducing GHG emissions within their boundaries. It is necessary to identify critical areas of high GHG emissions within a campus to help...
Article
Bangladesh observed an unprecedented growth in gross domestic product (GDP) and foreign direct investments (FDI) over the last decade. However, the country also observed an annual average increase in greenhouse gas emissions (GHGs) by 3.3% between 2000 and 2016. Therefore, this study aims to understand the dynamic relationship among GDP, FDI and GH...
Technical Report
Full-text available
During the past decade, the region of Okanagan Valley has become at greater risk of recurrent floods. The intensity of flood risk has increased and, as a result, the residential neighbourhoods became more vulnerable to flood damage. The current planning tools and regulatory flood resilience policies are seemingly lagging behind the pace at which fl...
Conference Paper
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Natural gas (NG) supplies approximately one-third of Canada's electricity and heating demand. Even though it is a cleaner form of energy compared to other fossil fuels, it still contributes to greenhouse gas emissions. Therefore, rigorous actions are required to further reduce the NG-related emissions. Renewable natural gas (RNG) is a greener optio...
Article
Rapid urbanization and climate change have increased the risk of urban flooding, causing massive infrastructure and human losses. The concept of resilience proposes new solutions to manage flood disaster. An urban flood resilience evaluation framework considering the flood disaster cycle of actual historic flood event and objective physical-socio-e...
Technical Report
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Floods cause significant damages to properties, human well-being, environment and pose an economic burden on governments. Flooding has a wide range of impacts on society and overall environment in the forms of damages to properties and infrastructure, injuries and deaths, among others. Contaminated floodwater tends to pollute potable water, canals...
Conference Paper
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The building sector is responsible for 17% of the annual greenhouse gas (GHG) emissions in Canada. Space and water heating are the main contributors to the building-level GHG emissions, primarily due to natural gas combustion. Although carbon-capturing is an emerging technology used to curb the GHG emissions in the fossil fuel power generation sect...
Article
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Water distribution systems (WDSs) are designed to supply water to consumers. Previously, the performance of WDSs was assessed based on the hydraulics, i.e., delivering water with sufficient quantity and good quality under the desired pressure. However, the recent sustainability paradigm has been widely recognized in engineering projects, leading wa...
Article
Aquatic Centres (ACs) in cold regions, serving thousands of visitors year-round, strive to achieve sustainability of their complex processes, e.g., safe indoor environment, water and energy efficiency, and customer satisfaction. In the absence of a structured performance benchmarking process, the facility management functions with no impetus for im...
Article
This study aims to develop an integrated framework to investigate and assess fire safety strategies, including protection and intervention. The proposed framework is also able to predict potential fire impacts and recommend optimal fire strategies; a case study of British Columbia was considered. The results showed that 58% of the fires were detect...
Article
The environmental impacts of the mining industry as well as reduction strategies are important issues that have been highlighted as a result of the environmentally-friendly policy of green mining. As part of that policy, this study developed an approach based on a multi-layer artificial neural network and fuzzy cognitive map to predict the vertical...
Article
https://authors.elsevier.com/c/1cERW15eiez-tV Distributed energy systems powered by renewable energy are one solution to the environmental and economic concerns of energy use. While energy planning and optimization have been conducted mainly as a mathematical exercise, practical approaches that incorporate the engineering realities and uncertainti...
Article
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Real-time pricing (RTP), as the most effective electricity pricing method, has recently attracted significant attention in tackling the challenges of the evolving power grid such as peak shaving and shifting, as well as the emergence of energy prosumers. However, the realization of RTP schemes require an advanced metering infrastructure (AMI). Ther...
Article
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Fuzzy cognitive maps (FCMs) have been widely applied to analyze complex, causal-based systems in terms of modeling, decision making, analysis, prediction, classification, etc. This study reviews the applications and trends of FCMs in the field of systems risk analysis to the end of August 2020. To this end, the concepts of failure, accident, incide...
Article
Carbon-dioxide (CO 2) is a critical heat trapping greenhouse gas (GHG) that results in global warming. Thus, many countries across the world including Canada have agreed for national level emission reduction targets. A significant fraction of the anthropogenic CO 2 is emitted from fossil fuel-based energy generation. Carbon-dioxide capture, storage...
Conference Paper
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Building sector is the third largest energy consumer in Canada, and over 81% of the Canadian GHG emissions are due to energy. The bulk of the energy consumed in Canadian buildings is for space and water heating, due to the extreme winter conditions. Even though it is commonly believed that heating via electricity produces less GHG emissions in some...
Conference Paper
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Green building construction has received global interest over the past two decades. The definition of a green building has evolved from energy-efficient buildings to net-zero buildings, and now is expanding towards net-positive buildings. Even though these concepts entail significant environmental benefits, they largely overlook life cycle environm...
Conference Paper
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Air conditioning accounts for 56% of the total energy consumption in buildings located in tropical regions. The sensible heat gain (SHG) is always higher compared to latent heat gain (LHG) in such buildings due to extreme solar irradiance. During the daytime, SHG can rise over 200% compared to LHG. Previous research identified the building envelope...
Article
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This study focuses on locating and planning cement plants for environmentally friendly cement production and distribution by achieving environment-oriented and economic objectives. This study introduces a new stochastic goal-programming model with fuzzy-weighted goals. Dust and gaseous emissions are inevitable despite improvements in the chemistry,...
Article
The water distribution network is one of the most expensive parts of a water supply system. The fundamental variables of a network, material, diameter, length, age, and the hydraulic pressure of pipes are the factors that affect the pipe burst rate (PBR). Establishing a relationship among the burst rate and these factors is an important step to ass...
Conference Paper
Full-text available
Energy-related decision making for a building is a demanding task, due to the challenges associated with energy system performance prediction. Performance prediction can be done either with simulation tools or by referring to the building energy performance databases. However, in Canada, interactive building energy performance databases that allow...
Conference Paper
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The interest in renewable energy as an alternative to conventional fossil fuels has grown in recently, in response to the environmental and economic concerns of energy use. Energy Step Codes are now mandating net-zero energy buildings, to facilitate the emissions reduction targets of Canada at provincial and federal levels. While net-zero energy bu...
Conference Paper
Electricity generation using solar photovoltaic (PV) can be considered as one of the key low-emission energy technologies that reduce building net operational level emissions compared to the fossil fuels-based energies. Small-scale grid-tie solar (PV) systems are being widely used in many parts of the world. These systems would be benefitted to the...
Article
The building industry has a high energy consumption, which results in natural resource depletion, land use, ecosystem degradation, atmospheric pollution, and many other environmental impacts. Therefore, in modern construction, while maintaining a satisfactory and comfortable interior environment, less energy consumption and resource use is a major...
Article
A net-zero water (NZW) community can be developed by combining various water supply sources, conservation measures, and water reuse approaches over time. A decision support system is required to assess the site-specific economic and environmental potential of NZW development. This paper develops a cost module and size-dependent energy submodule in...
Poster
Full-text available
The purpose of disinfection is to inactive pathogens from the drinking water however, these disinfectants if react with natural organic matter form disinfection by-products (DBPs). The DBPs have been extensively studied since early 1970s and some of them have been regulated by United States Environmental Protection Agency (USEPA) known regulated DB...
Conference Paper
New residential buildings are not only larger in size but also have higher window to wall ratios which results in higher heat losses. In order to decrease the heat losses associated with glass windows, several types of window technologies have been developed. Double and triple glazed windows with argon filled coatings are two of the most common typ...
Conference Paper
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Building sector has consumed over 40% of the total energy in the European Union and United States. The upward trend in environmental impacts of buildings will continue in the future due to the growth in population, longer hours spent inside buildings, and increasing demand for building services and occupants' comfort. Due to the above concerns, red...
Poster
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Disinfection plays a critical role in drinking water treatment for the removal of microorganisms. The disinfection process involves the use of different types of disinfectants, which are oxidizing agents that react with natural organic matter (NOM) to form disinfection by-products (DBPs). The United States Environmental Protection Agency (USEPA) ha...
Conference Paper
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Appropriate methods of construction can significantly contribute to achieving the goals of sustainability. In this regard, sustainability performance assessment of a building in its full life cycle is needed to select most sustainable construction methods. In this paper, a life cycle based performance assessment framework is proposed for modular bu...
Conference Paper
Green building construction is a rapidly evolving industry in Canada. The growth in sustainable buildings construction is driven by market conditions and benefits acquired during buildings operational stage. However, adoption of green practice in residential buildings is negatively impacted by the high initial investments required for green product...
Conference Paper
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Energy system planning is a complex problem, where a number of conflicting priorities need to be considered with regards to energy use, environment and socioeconomic impacts, and stakeholder requirements. When selecting the supply sources for a net-zero community energy system, renewable energy (RE) technologies need to be evaluated and compared ba...
Poster
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Utilities need to control the formation of both R-DBP and UR-DBPs. DBPs species have different formation pattern and levels under different set of environmental and operational conditions. Multi-barrier approach is required to minimize the formation of a wide range of DBPs. Small systems have limited financial and technical resources hence their ch...
Article
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Life cycle impact assessment methodology was applied to the cement manufacturing sectors in China and Canada for comparative purposes. Primary air emissions of NOx, SO2, PM, and CO were evaluated in terms of intensity per tonne of Portland cement and in respect of their contribution to winter smog. The Eco-Indicator 99 impact category for respirato...
Article
A comprehensive water-energy-carbon (WEC) nexus model for an urban water system (UWS) using system dynamics is proposed to assist municipalities, urban developers, and policy makers for neighborhood water planning and management. The proposed model and decision support tool was developed for the operational phase of UWSs. The model was validated us...
Article
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Several risk factors associated with the increased likelihood of healthcare-associated Clostridium difficile infection (CDI) have been identified in the literature. These risk factors are mainly related to age, previous CDI, antimicrobial exposure, and prior hospitalization. No model is available in the published literature that can be used to pred...
Article
Modular construction has been recognized as one of the primary methods for sustainable off-site construction in the recent past. However, in a given building project, the process of selecting a suitable construction method among different options is still made based on anecdotal evidence. Thus, it is imperative to evaluate the life cycle sustainabi...
Article
Ongoing climate action programs are prompting more stringent energy performance standards for buildings. Consequently, energy retrofitting of existing buildings has become a common climate action initiative around the world. Building owners are keen to assess the technical and financial feasibility of energy retrofitting in pre-project planning sta...
Conference Paper
Full-text available
With the rapid growth in urban population, sustainable waste management has become a major challenge. Despite being considered an economic, environmental and social burden on communities, waste can also be a resource. The potential of utilising MSW in energy generation has been widely investigated, as a dual solution to the issues of waste manageme...
Article
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The building industry has regularly been criticized for resource exploitation, energy use, waste production, greenhouse gas emissions, and impacts on the landscape. The growing population demands more built environment to accommodate the socioeconomic wellbeing. Adopting conventional construction practices would continue the aforementioned issues....
Article
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During the recent past, the individual responsibility of climate change mitigation has been acknowledged by the society at large. Energy planning is pivotal in mitigating GHG emissions and adopting climate resilient strategies. However, community level energy planning has been overlooked in the urban development planning and the approval process. M...
Article
Environmental and operational benefits of green roofs are manifolds; however, their main disadvantages are cost and weight. New technology enabled the use of plastics to reduce the weight of green roof systems to promote their installation. To maximize their potential benefits, green roofs can be installed on existing structures. This study evaluat...
Article
Full-text available
The residential building sector in Canada consumes 17% of the total energy and contributes to 15% of the total greenhouse gas emissions. Predominantly, the energy demand for cooling in the residential sector is increasing due to large occupancy floor area and high usage of air-conditioning. Minimizing energy use and associated emissions is one of t...
Article
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Growing environmental and socioeconomic concerns due to rapid urbanization, population growth and climate change impacts have motivated decision-makers to incorporate sustainable best practices for transportation infrastructure development and management. A “sustainable” transportation infrastructure implies that all the sustainability objectives (...
Article
Full-text available
In Canada, the residential building sector consumes 17% of the total energy and 15% of the total greenhouse gas emissions. In particular, the energy demand for cooling in the residential sector is increasing due to the large occupancy floor area and high usage of airconditioning. Minimizing energy use and greenhouse gas emissions is one of the high...
Article
New district energy projects facilitate to decentralize their energy supply, create efficiency in the production and distribution of energy, and enable the use of renewable fuels. Selection of an appropriate project delivery and contracting strategy is essential to achieve owner's key objectives over the lifecycle of a district energy facility. The...
Article
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Growth of the unconventional gas industry is predicted to continue to be an important component of the global energy landscape. The rapid expansion of shale and tight gas development has raised many environmental and human health concerns, particularly in regards to ground and surface water contamination. The unconventional gas industry has begun t...
Article
Government of Canada has identified over 22,000 contaminated sites across Canada. Custodians are responsible to manage environmental risks of their sites to human health and the environment (Treasury Board of Canada Secretariat in Federal Contaminated Sites Inventory, 2015) from identifying the contaminants to choosing an optimal remediation techno...
Article
The building stock in the world consumes approximately 40% of the energy and emits one third of the total greenhouse gases emissions (GHG). Improving the energy efficiency in buildings is vital to address the climate change and achieve energy independence (i.e. to become net-zero energy). Improving energy performance in existing buildings has been...
Article
An efficient waste treatment strategy should be cost-effective and minimize potential impacts on various stakeholders and the environment. This study proposes a decision framework that can model the stakeholder's conflicting priorities over the sustainability criteria, when selecting a municipal solid waste treatment option. The proposed framework...
Article
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Construction industry creates a massive amount of waste, which typically ends up in landfills. Canadian construction industry represents 30% of the total municipal solid waste deposited in landfills. Construction and demolition (C&D) waste has created negative socioeconomic and environmental impacts including contaminating ground water, emitting gr...
Article
Procurement is a key process in construction project management. The current construction procurement practices have been widely criticized for disregarding sustainability in the project life cycle. At present, there is a gap of knowledge on status-quo of sustainable procurement in Canada. Therefore, the objective of this study is to review sustain...