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Open AccessArticle

Effects of Orientations, Aspect Ratios, Pavement Materials and Vegetation Elements on Thermal Stress inside Typical Urban Canyons

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Department of Architecture and Technology, Norwegian University of Science and Technology, 7491 Trondheim, Norway
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TECNALIA, Energy and Environmental Division, Parque Tecnologico de Bizkaia, Edificio 700, 48160 Derio, Bizkaia, Spain
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CENSAM, Singapore-MIT Aliance for Reasearch and Tecnology (SMART), 1 Create Way, Singapore #09-03, Singapore
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Department of Technology, Management and Economics, Technical University of Denmark, Marmorvej 51, Building FN Byen, 2100 Copenhagen, Denmark
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2019, 16(19), 3574; https://doi.org/10.3390/ijerph16193574
Received: 14 June 2019 / Revised: 15 September 2019 / Accepted: 17 September 2019 / Published: 24 September 2019
The analysis of local climate conditions to test artificial urban boundaries and related climate hazards through modelling tools should become a common practice to inform public authorities about the benefits of planning alternatives. Different finishing materials and sheltering objects within urban canyons (UCs) can be tested, predicted and compared through quantitative and qualitative understanding of the relationships between the microclimatic environment and subjective thermal assessment. This process can work as support planning instrument in the early design phases as has been done in this study that aims to analyze the thermal stress within typical UCs of Bilbao (Spain) in summertime through the evaluation of Physiologically Equivalent Temperature using ENVI-met. The UCs are characterized by different orientations, height-to-width aspect ratios, pavement materials, trees’ dimensions and planting pattern. Firstly, the current situation was analyzed; secondly, the effects of asphalt and red brick stones as streets’ pavement materials were compared; thirdly, the benefits of vegetation elements were tested. The analysis demonstrated that orientation and aspect ratio strongly affect the magnitude and duration of the thermal peaks at pedestrian level; while the vegetation elements improve the thermal comfort up to two thermophysiological assessment classes. The outcomes of this study, were transferred and visualized into green planning recommendations for new and consolidated urban areas in Bilbao. View Full-Text
Keywords: outdoor thermal comfort; PET; ENVI-met; urban canyon; coastal; mid-latitude regions outdoor thermal comfort; PET; ENVI-met; urban canyon; coastal; mid-latitude regions
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Lobaccaro, G.; Acero, J.A.; Sanchez Martinez, G.; Padro, A.; Laburu, T.; Fernandez, G. Effects of Orientations, Aspect Ratios, Pavement Materials and Vegetation Elements on Thermal Stress inside Typical Urban Canyons. Int. J. Environ. Res. Public Health 2019, 16, 3574.

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