Sheikh Ahmad Zaki
Effects of roadside trees and road orientation on thermal environment in a tropical city.
Zaki, Sheikh Ahmad; Toh, Hai Jian; Yakub, Fitri; Mohd Saudi, Ahmad Shakir; Ardila-Rey, Jorge Alfredo; Muhammad-Sukki, Firdaus
Hai Jian Toh
Ahmad Shakir Mohd Saudi
Jorge Alfredo Ardila-Rey
Emerging tropical cities are experiencing rapid population growth and development, which can greatly affect the thermal environments. The effects of roadside trees and road orientation on the outdoor thermal environment were investigated on four different roads in Kuala Lumpur, Malaysia. Field measurements were conducted to assess outdoor thermal environments, where the selection of sites was based on different roadside tree morphological features and road orientations. Outdoor air temperature (Ta), relative humidity (RH), globe temperature (Tg), wind speed (WS), and wind direction (WD) were measured. Absolute humidity (AH) was estimated based on relative humidity and air temperature. Planting dense canopy trees with an average sky view factor (SVF) of 0.07 reduced the mean radiant temperature (Tmrt) by 35% and the physiological equivalent temperature (PET) by 25%. East–West (E–W) and Northwest–Southeast (NW–SE) oriented roads had high PET values of 41°C and 43°C, respectively. North–South (N–S) and Northeast–Southwest (NE–SW) orientated roads had lower PET values (37°C), providing improved outdoor microclimate. Roadside trees provided greater cooling potential in E–W and NW–SE oriented roads. The findings are useful for urban road design in tropical cities in order to improve the outdoor thermal environment and pedestrian comfort.
|Journal Article Type||Article|
|Publication Date||Feb 29, 2020|
|Peer Reviewed||Peer Reviewed|
|Institution Citation||ZAKI, S.A., TOH, H.J., YAKUB, F., MOHD SAUDI, A.S., ARDILA-REY, J.A. and MUHAMMAD-SUKKI, F. 2020. Effects of roadside trees and road orientation on thermal environment in a tropical city. Sustainability [online], 12(3), article 1053. Available from: https://doi.org/10.3390/su12031053|
|Keywords||Field measurements; Roadside trees; Road orientation; Thermal environment; Thermal comfort; Physiological equivalent temperature|
ZAKI 2020 Effects of roadside