Architecture, Building and Planning - Research Publications
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ItemEvaluating the impact of material service life on embodied energy of residential villas in the United Arab Emirates(Emerald, 2024)Purpose: Recently, there has been a shift toward the embodied energy assessment of buildings. However, the impact of material service life on the life-cycle embodied energy has received little attention. We aimed to address this knowledge gap, particularly in the context of the UAE and investigated the embodied energy associated with the use of concrete and other materials commonly used in residential buildings in the hot desert climate of the UAE. Design/methodology/approach: Using input–output based hybrid analysis, we quantified the life-cycle embodied energy of a villa in the UAE with over 50 years of building life using the average, minimum, and maximum material service life values. Mathematical calculations were performed using MS Excel, and a detailed bill of quantities with >170 building materials and components of the villa were used for investigation. Findings: For the base case, the initial embodied energy was 57% (7390.5 GJ), whereas the recurrent embodied energy was 43% (5,690 GJ) of the life-cycle embodied energy based on average material service life values. The proportion of the recurrent embodied energy with minimum material service life values was increased to 68% of the life-cycle embodied energy, while it dropped to 15% with maximum material service life values. Originality/value: The findings provide new data to guide building construction in the UAE and show that recurrent embodied energy contributes significantly to life-cycle energy demand. Further, the study of material service life variations provides deeper insights into future building material specifications and management considerations for building maintenance.
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ItemTerrestrial Lidar Reveals New Information About Habitats Provided by Large Old Trees(Elsevier, 2024)Large old trees have been described as keystone habitats for several species. However, current research does not fully explain why these species show a preference for such trees. In this study, we combined field observations of birds with terrestrial lidar scans and computational feature-recognition to describe habitats provided by trees at an unprecedented level of detail. We conducted field observations of birds at 62 trees and used parameters including branch angle, branch diameter, branch state (living or dead), and trunk diameter at breast height (DBH) to develop a generalised linear mixed model (GLMM) that could predict which types of branch birds are more likely to visit. We then quantified angles, diameters, and states of 78,006 branch objects representing the complete canopies of 16 trees. By combining these two models we predicted that large trees (>80 cm DBH) contained, on average, 383 m of branches that were highly suitable for birds (i.e., the predicted probability of observing a bird was ≥0.5), which was more than seven times the average length of highly suitable branches provided by medium trees (51–80 cm DBH). Only one of the sampled medium trees contained highly suitable branches. Small trees (<50 cm DBH) contained none. Our analysis provides new knowledge about characteristics that make large old trees disproportionately attractive to birds and presents a novel method of assessment that can apply to other complex habitat structures.
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ItemNo Preview AvailableLand surface and air temperature dynamics: The role of urban form and seasonality(ELSEVIER, 2023-12-20)Due to the scarcity of air temperature (Ta) observations, urban heat studies often rely on satellite-derived Land Surface Temperature (LST) to characterise the near-surface thermal environment. However, there remains a lack of a quantitative understanding on how LST differs from Ta within urban areas and what are the controlling factors of their interaction. We use crowdsourced air temperature measurements in Sydney, Australia, combined with urban landscape data, Local Climate Zones (LCZ), high-resolution satellite imagery, and machine learning to explore the influence of urban form and fabric on the interaction between Ta and LST. Results show that LST and Ta have distinct spatiotemporal characteristics, and their relationship differs by season, ecological infrastructure, and building morphology. We found greater seasonal variability in LST compared to Ta, along with more pronounced intra-urban spatial variability in LST, particularly in warmer seasons. We also observed a greater temperature difference between LST and Ta in the built environment compared to the natural LCZs, especially during warm days. Natural LCZs (areas with mostly dense and scattered trees) showed stronger LST-Ta relationships compared to built areas. In particular, we observe that built areas with higher building density (where the heat vulnerability is likely more pronounced) show insignificant or negative relationships between LST- Ta in summer. Our results also indicate that surface cover, distance from the ocean, and seasonality significantly influence the distribution of hot and cold spots for LST and Ta. The spatial distribution for Ta hot spots does not always overlap with LST. We find that relying solely on LST as a direct proxy for the urban thermal environment is inappropriate, particularly in densely built-up areas and during warm seasons. These findings provide new perspectives on the relationship between surface and canopy temperatures and how these relate to urban form and fabric.
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ItemNo Preview AvailableHaving a tree in front of one's home is associated with GREATER subjective wellbeing in adult residents in Melbourne, Australia, and Toronto, Canada.(Elsevier BV, 2024-02-13)While urban trees can be important determinants of human health and wellbeing in world cities, the specific influence of nearby urban trees upon human wellbeing has not been adequately explored. While many studies have associated urban greenery abundance with wellbeing scores, many measures of urban greenery do not specify the type of vegetation or the impact of co-location. Here we fill this gap by associating self-reported measures of the presence of nearby trees (tree in front of one's home) with validated subjective wellbeing (SWB) scores. We also tested for the mediating role of what people thought about trees and nature, with a focus on the values people associate with urban trees and nature relatedness (NR). We used electronic panel survey data based on a demographic and geographical representative sample of more than 3400 residents living in Toronto, Canada, and Melbourne, Australia. We analysed these data using regression-based mediation and path analyses. We found that having a tree in front of one's home was strongly and positively associated with SWB scores in both cities with similar results (Melbourne, β = 0.17, p < 0.05; Toronto, β = 0.18, p < 0.05), while accounting for NR, values associated with urban trees, and demographics (e.g., age, education, home ownership). The mediating role of NR and values was small. The specific pathways of association between tree in front of one's home, SWB, NR, and values, varied by city, when accounting for demographics. We discuss how increasing the abundance of nearby urban trees in cities may also increase human wellbeing.
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ItemNo Preview AvailableAustralians' perceptions of the potential effects of increased access to alcohol via autonomous delivery services: A multi-method study(PERGAMON-ELSEVIER SCIENCE LTD, 2024-01)INTRODUCTION: Rapid technological change will affect how people access harmful products. For example, automated delivery services are forecast to provide fast and affordable product access options for those purchasing alcohol. Information about the potential impacts of such innovations on alcohol purchase and consumption behaviors is lacking. The aim of this study was to explore how consumers may respond to future scenarios where alcohol is available via a range of autonomous alcohol delivery options. METHODS: In a two-stage process, qualitative individual interviews (n = 100) and a quantitative online survey (n = 1078) were conducted with Australians aged 18+ years. Quotas were used to achieve national representation on key demographic variables. Participants were exposed to scenarios outlining how autonomous vehicles are likely to be used for alcohol deliveries in the future and asked to discuss their intentions to use such services and their perceptions of any impacts on alcohol consumption at a societal level. RESULTS: Automated alcohol deliveries were generally considered to be highly convenient and therefore likely to be popular. Around one-third (37%) of survey respondents reported an intention to use such automated alcohol delivery services once they are available and almost half (47%) expected overall levels of alcohol consumption to increase across the population. CONCLUSION: Given potential levels of uptake, careful consideration needs to be given to the development and implementation of appropriate policy and regulatory frameworks to minimize the increased risk of alcohol-related harm associated with enhanced alcohol availability resulting from the emerging availability of autonomous delivery services.
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ItemLong-term service contracts for the mobilization of private financing for the reform of the informal public transport sector in the Philippines(Elsevier BV, 2024-03-01)Considered the most ambitious program in the Philippines, the Public Utility Vehicle Modernization Program (PUVMP) requires transport cooperatives to replace their old jeepney with modern units. This however requires massive financing, and the government only provides very limited equity subsidies. This paper examines the impact of service contracts (SC) on the financial capacity of transport cooperatives to replace their fleet of old jeepney units. Using qualitative data drawn from interviews with 12 transport cooperatives, we investigate the effect of service contracting on the ability of transport cooperatives to access financing in terms of loans from banks. We find that long-term service contracts can enhance the level of confidence of transport cooperatives to service debt. Our work presents a novel mechanism to mobilize financing from private banks for the reform of the informal transport sector.
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ItemRe-writing history, re-inscribing the city: Thailand and delusions of democracy(SAGE Publications, 2023-11)Cities carry traces of their pasts; they also carry traces of imagined pasts, inscribed on them by authoritarian regimes to suppress other imaginings. Bangkok in the early 20th century displayed the signification of a Buddhist royalty and imagined origins, subsequently suppressed with the imposition of new emblems of democracy following a 1932 overthrow of monarchical absolutism. Democracy was to be signified as founded in the common people. In the 21st century, a military junta dressed in the clothes of a pseudo-democracy re-writes the emblems of democracy, now to signify that democracy is not based in the people but, rather, is the gift of a benevolent monarch. The subverting of democracy is to be read from the monuments of the city, which highlight the specific strategies that the authoritarian state invokes in re-writing the national history.
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ItemLife cycle environmental benchmarks for Flemish dwellings(IOP Publishing, 2024-03-01)To reduce the environmental effects caused by building construction and operation, life cycle assessment (LCA) is increasingly applied. In recent years, national building regulations have implemented LCA requirements to support building life cycle impact reduction. A key element in these regulations are environmental benchmarks which allow designers to compare their building designs with reference values. This study aims to develop bottom-up life cycle environmental benchmarks that represent the range of environmental impact results achieved with conventional construction in Flanders, Belgium. For this purpose, the study investigates the potential of using a database of building energy performance calculations. Specifically, this study considers 39 residential buildings identified as representative of the Flemish energy performance of buildings database of 2015–2016, applying modifications to establish scenarios that are still relevant in 2025. The buildings are assessed with the Belgian LCA tool TOTEM to calculate an aggregated environmental score based on the European product environmental footprint (PEF) weighting approach and including 12 main impact categories. In addition to the aggregated score, the climate change (CC) indicator is analysed individually. In view of the benchmarks, variations were applied to the 39 original buildings in terms of heating system and materialisation. The variation in heating system included changing gas boilers to electric heat pumps to comply with upcoming (2025) Flemish building regulations. The variations in building materials included three sets of conventional Flemish building element compositions that were applied to generate a wider spread of impact results as a basis for benchmarks. Benchmark values were derived through a statistical analysis of the 117 modelled variants: a best-practice value (10th percentile), reference value (median) and limit value (90th percentile). For the environmental score, the benchmark values are 86, 107 and 141 millipoints per square meter of gross heated floor area (GHFA) (mPt m−2GHFA), respectively; and for CC, the benchmark values are 844, 1015 and 1284 kg CO2-eq m−2 GHFA. Finally, the study discusses the representativeness, implications and limitations of the final benchmarks and benchmark approach.
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ItemNo Preview AvailableClimate Resilient Infrastructure: Connecting and Dividing the Cities of the Future(Taylor and Francis Group, 2023)