Assessment of urban physical features on summer thermal perceptions using the local climate zone classification

Urbanisation has changed local meteorological conditions worldwide. The physical features of outdoor spaces are critical in determining outdoor thermal comfort through changes in meteorological parameters. Past studies comparing subjective thermal perception between local climate zones (LCZ) were mainly conducted in humid subtropical regions. This study aims to investigate this relationship using outdoor thermal comfort survey data collected in three research projects in Melbourne, Australia (temperate oceanic climate) (n = 4717). The physical features investigated included the sky view factor (SVF) and LCZ classification. During Melbourne's summer, people preferred a higher PET value than neutral PET across all LCZs. People in urban green spaces (LCZs B and C) were more likely to feel ‘neutral’ when Physiological Equivalent Temperature (PET) was 15.5 °C–24.5 °C and less likely to feel ‘slightly warm to hot’ when PET was 24.6 °C–55.6 °C. Furthermore, LCZ 6 (LCZ C) reported the highest (lowest) percentage of unacceptable votes. Cluster analysis identified two thermal comfort patterns (neutral and warm groups) representing various thermal sensations and preferences. The thermal comfort patterns proportion differed between built LCZs (5, 6) and land cover LCZs (B, C). Logistic regression revealed that PET values and urban morphology (i.e., LCZ) contributed significantly to people's thermal sensations and acceptability for neutral and warm groups. SVF significantly predicted the thermal sensation and acceptability for the warm group but not the neutral group. Our study approach informs further research to understand the implications of urban design in outdoor spaces using thermal comfort patterns as a benchmark

The role of education in the circular built environment: Analysis of Australian educational programs impact on construction and demolition waste management

Resource circularity has become a necessity in the built environment sector. A significant amount of construction and demolition (C&D) waste is generated worldwide. This waste results from poor resource efficiency in the sector. Australia is among the lowest-ranked countries in the Organisation for Economic Co-operation and Development (OECD) regarding the sector's resource efficiency. A circular economy and resource efficiency can be achieved primarily through education, enforcement, and encouragement in the sector. Of these three elements, education is the focus of this paper. Education can generate attitudinal and behavioural change among stakeholders to move towards effective waste management (WM). This study aims to determine whether current Australian educational programs have successfully achieved circular economy objectives and improved resource efficiency. This paper provides an insightful overview of the programs and proposes a framework to evaluate the effectiveness of educational programs in a circular built environment. Lastly, it recommends a few practical suggestions to improve their effectiveness in the built environment sector

Creation and Stimulation of End-markets for Construction and Demolition Waste in Australia

The generation of construction and demolition (C&D) waste from infrastructure, and building and housing activity across Australia is increasing, leading to C&D waste management becoming a high priority for federal, state, territory and local governments, private industry and the general public. In response to industry and public concerns related to unsustainable C&D waste management, this project aimed to enhance understanding of the operation and capacity of end-markets for C&D waste recyclables in Australian jurisdictions. This understanding involves the integration of circular economy principles and a cradle-to-cradle approach into C&D waste management systems in the Australian context

Evaluating assumptions of scales for subjective assessment of thermal environments – Do laypersons perceive them the way, we researchers believe?

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Perception of Wind in Open Spaces

Dense urbanization influences the livability of cities. Changes in local meteorological conditions can be adverse for human health and well-being. In urban open spaces, it is widely known that changes in building density and configuration in cities influence wind speed (Va). This influence modifies latent heat flux between the human body and surrounding environment and thereby affecting the thermal comfort conditions in open spaces between buildings. Several studies have demonstrated the significant effect of wind speed on outdoor thermal comfort. Melbourne’s Central Business District (CBD) has recently experienced dense urbanization and this pattern of development has instigated noticeable changes in meteorological conditions. Some evidence has suggested that the patterns of wind flow induce thermal discomfort during cool seasons. Conversely, the wind is most welcomed during warm seasons. This study was conducted to assess outdoor users’ responses to Va in three open spaces of an educational precinct in Melbourne’s CBD. The open spaces studied are different in terms of design and function. Users’ responses and meteorological conditions were examined through a series of field measurements and questionnaire surveys from November 2014 to May 2015. This study used three perceptual scales to analyze participants’ experience of Va during field surveys: “Bedford preference”, “thermal sensation” and “personal acceptability”. Analytical results yielded the wind perceptual comfort thresholds for different seasons as well as the entire study period. The results suggested that in addition to the geometry of the urban open space, the function of place could influence people’s perceptions of Va. The research findings contribute to developing thermally comfortable outdoor environments

Extended Producer Responsibility in the Australian Construction Industry

With the COVID-19 outbreak across the world, policymakers and authorities have realised that they cannot solve the emerging issues using conventional policies and practices. COVID-19 has severely affected many industries, including construction and demolition (C&D) waste management and C&D waste resource recovery sector. Extended Producer Responsibility (EPR) and schemes alike are policy instruments that prevent waste generation and promote a circular economy in the construction industry. These schemes are long adopted in various countries for different waste streams. EPR policy development and implementation, particularly for C&D waste, is still at an early stage in Australia. This study aims to review the Australian regulatory environment and practice to identify barriers and enablers towards successful policy development and implementation of C&D waste-related EPR. This study is based on secondary data that are publicly available. The document analysis was conducted to identify the level of regulatory and other stakeholders support in Australia. Following three rounds of examination of sources and applying multiple selection criteria, 59 different sources were reviewed in total. The results showed that there is widespread support among different stakeholders to develop EPR and expand the existing regulation to other materials. The barriers were cost and time implications for EPR policy establishment and enforcement, diversity of stakeholders involved, construction product lifecycle, responsibility of manufacturers, complexity in implantation of EPR regulations, modification inbuilt facilities and health and safety issues. Recommendations are made to alleviate these challenges. The outcome of this study could serve as a guideline for designing effective EPR policies

A Review of Cultural Background and Thermal Perceptions in Urban Environments

Thermal comfort is among the chief indicators of the sustainability of outdoor spaces. However, the complex nature of comfort represents the interaction of several determinants that leads to a perception of the thermal environment. Recently, researchers have paid particular attention to non-physical factors to understand the mechanisms involved in thermal perceptions in urban environments. The extant literature has contended that culture and cultural background are determinants to individuals’ thermal perceptions. Therefore, this study aimed to review how the link between outdoor thermal comfort (OTC) and cultural background is investigated. This is, to the best of our knowledge, the first review study on the subject. The study used a systematic literature review approach based on secondary data available in relevant and contemporary literature. The findings first showed the scarcity of research on cultural background and OTC; however, all studies identified corroborated the significant impact of cultural background on thermal perceptions. Notably, the cultural background was found to be the source of variation in thermal perceptions, tolerance to, and preference for certain thermal conditions, thermal comfort requirements and expectations, choice of clothing, and environmental attitudes. The findings provide a sound basis for future researchers to address the research gaps identified. The study also raises policy makers’ and designers’ awareness of urban environment users’ genuine needs and requirements

The Role of Cultural Heritage in Promoting Urban Sustainability: A Brief Review

Cities are hubs of social and cultural activity, and culture is key to what makes cities creative, and sustainable. The Post-2015 Development Agenda has prioritized culture and how it may help people and communities create the future they desire. The study aims to determine the link between cultural heritage and urban sustainability and how multidisciplinary education can help organize urban issues. The article is of relevance to the emerging multicultural urban society with wide socio-economic disparities straining the global urban resilience and posing a challenge for future policy implementation. A systematic literature review was conducted using the Dimension database, and the results were analyzed using VOS viewer. The study also employed the PRISMA quantitative approach for selection criteria. This paper has identified understudied themes including community heritage, sustainable urban governance, and behavioral and multidisciplinary approaches. It is strongly felt that undertaking this study will not only add to the literature in cultural heritage study but also help further multidisciplinary and knowledge-based inquiry, which is currently evolving in the academic domain. Therefore, urban academics have a duty to resolve the issue confronting global urban sustainability and cultural disputes. Future research is required to simplify the current complex issue to make it more relevant and inclusive

Using Recycled Construction and Demolition Waste Products: A Review of Stakeholders’ Perceptions, Decisions, and Motivations

While the increasing rate of urbanisation is a critical concern for socio-environmental reasons, this also leads to more extraction of natural raw materials and the generation of significant quantities of construction and demolition (C&D) waste. Although the use of recycled C&D waste products is technically feasible and regulated, and positive application examples are evident, it is still unclear how to engage key stakeholders to leverage this opportunity in construction projects. Previous research has shown that there is some level of resistance to the reuse of recycled C&D waste products in construction projects. This highlights a critical need to identify the roles of key stakeholders and the barriers they face when using recycled C&D materials. This paper therefore investigates the type of stakeholders influencing the use of recycled C&D waste products and the main factors affecting stakeholders’ decisions to use recycled C&D waste products through a systematic literature review. The authors present an emergent enablers and barriers for recycled C&D waste products model and provide commentary on how stakeholders’ perceptions, decision and behaviour influence the use of recycled C&D waste products. The authors also contribute to the body of knowledge with insights into the factors that various stakeholders believe influence the market for recycled C&D waste products and provides a reference point for authorities to consider these behavioural insights for policy reform