A new approach of urban livability in Tehran: Thermal comfort as a primitive indicator. Case study, district 22

Alijani, S.; Ahmad, Pourahmad; Nejad, Hossein Hatami; Ziari, Keramatollah; Sodoudi, Sahar

doi:10.1016/j.uclim.2020.100656

Cited by 22 publications

(8 citation statements)

References 64 publications

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“…Positive relations (R 2 ⩾0.91) between SVF and MRT were observed during daylight hours, indicating that in open spaces, incoming solar radiation raises the MRT. Conversely, the positive relationship noted during daytime hours was absent in the evening across all deployment scenarios, signifying that ground long-wave radiation escapes as streets widen or SVF values increase [48]. Our results do not indicate that increasing tree coverage, which creates canyons with low values of SVF (i.e.…”

Section: Impact On Mrtcontrasting

confidence: 62%

“…However, no landscape modification has occurred as of yet, and incorporation of green infrastructure is a possible next step in the site's landscape design. Currently, the Ray Cement Factory site subjects visitors to uncomfortable meteorological conditions during most summer days [48]. The nearby synoptic station at Mehrabad International Airport, about 15 km from the site, indicates that Tehran frequently encounters hot and dry summer days, with temperatures ranging from 33 • C to 40 • C and relative humidity peaking around 45%.…”

Section: Study Areamentioning

confidence: 99%

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Evaluating the effects of different tree species on enhancing outdoor thermal comfort in a post-industrial landscape

Vatani,

Kiani,

Mahdavinejad

et al. 2024

Environ. Res. Lett.

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A frequently emphasized strategy to reduce the burden of heat in cities across the world is the implementation of street trees. Here, we examine the effects of deciduous and coniferous tree deployment on meteorological variables and pedestrian themal comfort through analysis of the new dynamic thermal comfort (dPET) index, using the latest version of the computational fluid dynamics model ENVI-met. We performed on site observational measurements of air temperature (Ta), relative humidity (Rh), wind speed (Ws), and mean radiant temperature (MRT) at 5 different locations on the hottest day of summer 2023, in a post-industrial urban landscape located in Tehran, Iran. Observations were used to evaluate ENVI-met simulation performance and served as a baseline against which sensitivity experiments – based on a minimum (35%) and maximum (75%) intervention scenario for deciduous and coniferous trees – were compared against. Our analysis indicates that 35% and 75% deployment reduced Ta by 1.2°C and 4.2°C, respectively, for deciduous tree species, compared to a 0.9°C and 3.1°C reduction for coniferous species, during the hottest day of summer 2023. The maximum deployment scenario decreased MRT by approximately 60°C and 43°C for deciduous and coniferous tree deployment, respectively. The maximum tree deployment scenario decreased dPET by nearly 16°C and 14°C for deciduous and coniferous trees, respectively, during the time of day that diurnal heating is maximized. Our findings highlight micrometeorological and personalized thermal comfort effects associated with variable tree species type and extent through examination of a pedestrian's ambulatory experience across diverse urban microclimates in a region of the world that is particularly understudied.

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Section: Impact On Mrtcontrasting

confidence: 62%

Section: Study Areamentioning

confidence: 99%

Evaluating the effects of different tree species on enhancing outdoor thermal comfort in a post-industrial landscape

Vatani,

Kiani,

Mahdavinejad

et al. 2024

Environ. Res. Lett.

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“…To meet the 1.5°C and 2.0°C temperature control goals set out in the Paris Agreement, countries implemented development strategies such as emissions reduction, energy and industrial structure reform and others to strengthen the urban system’s resilience and ability to mitigate and adapt to climate change(Alijani et al , 2020). Along with urban growth and environmental change, urban administrators, inhabitants and scholars have been paying more attention to urban livability.…”

Section: Introductionmentioning

confidence: 99%

Climate change and extremes: implications on city livability and associated health risks across the globe

Filho

Tuladhar

et al. 2022

IJCCSM

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Purpose As global warming intensifies, climatic conditions are changing dramatically, potentially affecting specific businesses and cities’ livability. The temperature increase in cities significantly affects urban residents whose percentage is to reach about 70% by 2050. This paper aimed at highlighting the climate change risks in cities, particularly focusing on the threats to people’s health due to a continuous temperature increase. Design/methodology/approach This study was conducted in three main steps. First, the literature review on the effects of climate change, particularly on the continuous temperature rise in cities, was conducted based on the publications retrieved from PubMed, Science Direct, Google Scholar and Research Gate. Second, the survey was conducted for the sample cities for one month. Third, the questionnaire was used to assess possible climate change threats to the livability of cities. Findings The findings showed that urban areas are usually warmer than the surrounding rural areas, mainly due to the urban heat island effect, causing more hot days in metropolitan areas compared to rural areas. This paper outlines some mitigation and adaptation measures, which can be implemented to improve the livability in cities, their sustainability and the well-being of their populations. Originality/value This study reports on the climate change impacts on the health and livability of 15 cities, in industrialized and developing countries. It examines the average and maximum temperature and relative humidity of each city and its correlation with their livability. It was complemented by a survey focused on 109 cities from Africa, Asia, Europe, Latin America, North America and Oceania.

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“…Urban livability refers to the quality of life and wellbeing of residents in cities [1]. The concept includes the impact of environmental and climatic factors such as air temperature, air, and water quality, wind speed, relative humidity, solar radiation, and qualitative indicators of quality of life, pleasure, and joy [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…The concept includes the impact of environmental and climatic factors such as air temperature, air, and water quality, wind speed, relative humidity, solar radiation, and qualitative indicators of quality of life, pleasure, and joy [2,3]. Among these, the consideration of thermal comfort has been a focus of interest as urban climate affects all aspects of the city including building interiors, city architecture, and open spaces [1]. Hence, it has been seen that thermal comfort of urban open spaces promotes social life, interrelations of residents, and economic activities; or contrarily, enhances isolation and social exclusion [4].…”

Section: Introductionmentioning

confidence: 99%

Parametric Design and Comfort Optimization of Dynamic Shading Structures

Doris¹,

M.²,

Valdivia³

et al. 2021

Sustainability

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This work implements parametric tools to optimize the environmental design of urban adaptive shadings through multiobjective evolutionary algorithms that look for solutions of dynamic (time-changing) structures used in open public spaces. The proposal is located in Malecon Cancun Tajamar in the southeast part of Mexico, and the main objective is to enhance the thermal comfort of users as well as to become part of the social dynamics of the place reinforcing identity through appropriation. The proposed workflow includes four steps: (1) geometric modelling by parametric modelling tools; (2) simulation of environmental parameters by using BPS tools; (3) shape optimization by using an evolutionary algorithm; and (4) environmental verification of the results. The Universal Thermal Climate Index (UTCI) was used to assess the outdoor thermal comfort derived from the dynamic shadings. The results showed a significant improvement in the thermal comfort with absolute UTCI differences of 3.9, 7.4, and 3.1 °C at 8, 12, and 16 h, respectively, during the summer; and absolute differences of 1.4, 3.5, and 2 °C at 8, 12, and 16 h, respectively, during the winter. The proposed workflow can help to guide the early design process of dynamic shadings by finding optimal solutions that enhance outdoor thermal comfort.

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A new approach of urban livability in Tehran: Thermal comfort as a primitive indicator. Case study, district 22

Cited by 22 publications

References 64 publications

Evaluating the effects of different tree species on enhancing outdoor thermal comfort in a post-industrial landscape

Evaluating the effects of different tree species on enhancing outdoor thermal comfort in a post-industrial landscape

Climate change and extremes: implications on city livability and associated health risks across the globe

Parametric Design and Comfort Optimization of Dynamic Shading Structures

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