Computational fluid dynamics simulation of tree effects on pedestrian wind comfort in an urban area

Kang, Geon; Kim, Jae‐Jin; Choi, Won-Sik

doi:10.1016/j.scs.2020.102086

Cited by 65 publications

(23 citation statements)

References 38 publications

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“…As described in current studies [10][11][12][13], the factors that affect thermal comfort in pedestrian spaces include both natural factors (such as geography, climate and season) and artificial factors (such as street aspect ratio, vegetation and paving materials). Xuan Ma [6,7] used the physiologically equivalent temperature (PET) to determine the thermal comfort range, and extended the optimal walking time in pedestrian space by increasing building height and vegetation coverage.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Thermal Environment in Pedestrian Space Using 3D Thermal Imaging

Zhao

Luo²,

2020

Energies

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Pedestrian space is an important place for people’s outdoor activities. Its thermal environment affects pedestrian walking experience, route selection and physical health. This study presents a 3D thermography-based method to analyze and evaluate the spatial distribution of thermal comfort. The proposed 3D thermal image was generated using 3D city models captured by an unmanned aerial vehicle (UAV) and thermal images gathered by an infrared camera. It can visualize construction elements, but also simply output surface temperatures at selected points. This paper described the process of using 3D thermal images to analyze the built environment, and selected two pedestrian spaces as case study objects. Their thermal images and mean radiant temperatures (MRT) were obtained from field measurement data collected by a drone and infrared camera. The following findings were obtained: (a) the MRT difference in the pedestrian space between sunlit and shaded areas was more than 3 °C; (b) the MRT values at the measurement points near vegetation were lower; (c) when the ratio of street height to width (H/W) was larger, the MRT values at all measurement points varied slightly. These findings can be used for the designers to evaluate and improve the thermal environment in pedestrian space.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Thermal Environment in Pedestrian Space Using 3D Thermal Imaging

Zhao

Luo²,

2020

Energies

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“…Studies have evaluated the UHI effect, urban climate disasters [15], and the thermal environment of residential areas [16][17][18][19] and campus areas [20,21]. With the expansion of cities, the building density and floor area ratio of new cities far exceeded those of old cities; thus, the new cities have become centers of strong UHI effects [22].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Microclimate and Outdoor Thermal Comfort of Street Canyon Typology in Extremely Hot Weather—A Case Study of Busan, South Korea

Chang

Yoon

2022

Atmosphere

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As cities are extremely vulnerable to the impacts of climate change, they are fundamental in addressing these changes. However, streets, which are external spaces accessed by citizens in daily life, play an important role in improving the urban environment and public health. This study considered Busan in South Korea as a case study to investigate street canyons, including street canyon geometries and tree configurations, of old, present, and new city centers. The influence of morphological factors on the microclimate and outdoor thermal comfort was evaluated using the ENVI-met program for extremely hot weather. Changes in the street width, street orientation, and street canyon aspect ratio had a significantly higher impact on the microclimate and thermal comfort index (p < 0.01). These results indicated that the orientation of the main street should be consistent with the prevailing wind direction of Busan. Further, the shading of adjacent buildings improved the outdoor thermal comfort and reduced the significance of tree configuration in deeper street canyons. In addition, tree height had a more significant impact on street environment than other tree configuration factors, especially when the tree height increased from 9 m to 12 m. We recommended that the thermal comfort level can be improved by dynamically adjusting the relationship between the planting distance and tree height in streets having shallow street canyons.

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“…De este modo, la estrategia más recomendada para mitigar los efectos del viento en el espacio de las calles es el uso de árboles como cubierta protectora vegetal (Kang et al, 2020). Pero, aunque los árboles traen asociados muchos otros beneficios, estos requieren un tiempo prolongado de crecimiento para alcanzar ese nivel de protección.…”

Section: Introductionunclassified

Umbrales aerodinámicos como estrategia de diseño para mitigación de efectos del viento en el espacio público

Castro¹

2022

urbearq

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Computational fluid dynamics simulation of tree effects on pedestrian wind comfort in an urban area

Cited by 65 publications

References 38 publications

Analysis of the Thermal Environment in Pedestrian Space Using 3D Thermal Imaging

Analysis of the Thermal Environment in Pedestrian Space Using 3D Thermal Imaging

Numerical Study on Microclimate and Outdoor Thermal Comfort of Street Canyon Typology in Extremely Hot Weather—A Case Study of Busan, South Korea

Umbrales aerodinámicos como estrategia de diseño para mitigación de efectos del viento en el espacio público

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