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Improving the Climate Resilience of Urban Road Networks: A Simulation of Microclimate and Air Quality Interventions in a Typology of Streets in Thessaloniki Historic Centre

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  • Nikolaos Sylliris

    (School of Spatial Planning and Development, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece)

  • Apostolos Papagiannakis

    (School of Spatial Planning and Development, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece)

  • Aristotelis Vartholomaios

    (School of Architecture, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece)

Abstract

The improvement of the urban microclimate in the densely-built central areas of Mediterranean cities should be a key objective of integrated urban and transport planning and design in accordance with the UN Sustainable Development Goals on energy, sustainable cities, and climate action. The urban climate of cities in warm regions, already burdened by the urban heat island effect, is expected to worsen further due to the global climate crisis. This study investigates the performance of common environmental street design strategies on microclimate, thermal comfort, and air quality under extreme heat conditions in the Mediterranean city of Thessaloniki, Greece. A typology of streets was selected using criteria such as road functional classification and orientation, land uses, building height/street width ratio, the sky view factor, and the continuity/discontinuity of buildings. A conservative scenario (use of cool/photocatalytic and porous materials for sidewalks, lighter pavements, additional tree planting, installations of green roofs) and a radical scenario (pedestrianization and total traffic prohibition) of environmental design interventions were simulated using the ENVI-met 5.1 software. The research findings demonstrated that the car-free interventions combined with the use of environmentally friendly materials in the public realm could significantly reduce the heat island effect and mitigate gaseous pollutants. The perceived air temperature (Physiological Equivalent Temperature—PET index) can decrease by up to 15 °C in well-shaded locations and near building corners, while nitrogen oxides can be reduced by up to 87% when considering a more radical pedestrianization scenario. The standardization of environmental interventions following a typology of urban streets could support planners and decision-makers in detecting the appropriate solutions for improving the urban microclimate.

Suggested Citation

  • Nikolaos Sylliris & Apostolos Papagiannakis & Aristotelis Vartholomaios, 2023. "Improving the Climate Resilience of Urban Road Networks: A Simulation of Microclimate and Air Quality Interventions in a Typology of Streets in Thessaloniki Historic Centre," Land, MDPI, vol. 12(2), pages 1-24, February.
  • Handle: RePEc:gam:jlands:v:12:y:2023:i:2:p:414-:d:1057627
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    References listed on IDEAS

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    1. Dimitra Founda & George Katavoutas & Fragiskos Pierros & Nikolaos Mihalopoulos, 2022. "The Extreme Heat Wave of Summer 2021 in Athens (Greece): Cumulative Heat and Exposure to Heat Stress," Sustainability, MDPI, vol. 14(13), pages 1-16, June.
    2. Mohammed Almahmood & Natalie Marie Gulsrud & Oliver Schulze & Trine Agervig Carstensen & Gertrud Jørgensen, 2022. "Human-centred public urban space: exploring how the ‘re-humanisation’ of cities as a universal concept has been adopted and is experienced within the socio-cultural context of Riyadh," Urban Research & Practice, Taylor & Francis Journals, vol. 15(1), pages 1-24, January.
    3. Santamouris, M., 2013. "Using cool pavements as a mitigation strategy to fight urban heat island—A review of the actual developments," Renewable and Sustainable Energy Reviews, Elsevier, vol. 26(C), pages 224-240.
    4. Apostolos Papagiannakis & Athina Vitopoulou & Athena Yiannakou, 2021. "Transit-oriented development in the southern European city of thessaloniki introducing urban railway: typology and implementation issues," European Planning Studies, Taylor & Francis Journals, vol. 29(1), pages 117-141, January.
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