A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The Role of Landscape Characteristics on Thermal Environment of Residential Streets in Warm-Humid Colombo
Street vegetation greatly affects the thermal comfort of pedestrians, thus creating habitable urban street landscapes. Nevertheless, the unplanned developments along streets have been a course of thermal discomfort at the pedestrian level. Therefore, the morphology of streets should be carefully considered when trees are introduced to improve outdoor thermal comfort (OTC). This research aims to assess the effects of street characteristics on the thermal comfort of residential streets in two selected local climate zones (LCZ) in Colombo. The research was conducted in five stages; (1) onsite measurements, (2) modelling the study area, (3) mapping the microclimatic and thermal comfort conditions, (4) comparing the results temporally and spatially and (5) developing recommendations. The climate parameters measured onsite were used for simulations in ENVI-met 5.0.3 Bio-met software to analyse the physiologically equivalent temperature (PET) at 1.5 m above ground level on a sunny day at 2.00 pm. Results revealed that comparatively lower Air temperature, relative humidity and higher wind speed improve OTC levels in warm-humid residential streets. Further, morning thermal discomfort conditions have resulted due to either releasing release of the stored heat in the building or high RH values and low wind speed. Streets located completely in compact low-rise LCZ thermally cause more discomfort than streets completely or partially in open low-rise LCZ. Vegetation is the most effective way to improve OTC, especially using large trees with grass. Homogenous shade coverage consistently distributes thermal comfort. However, irrespective of the street axis orientation, shade coverage is more important in terms of enhancing OTC. Planting large trees in residential land plots along narrow streets and medium trees in centre-median on wider roads is highly recommended. ENVI-met shows a strong correlation between measured and simulated Ta, yet, it is recommended to have nesting grids for more accurate results. These findings help professionals in climate-responsive policymaking for urban residential streets since local climate change is in urgent need.
The Role of Landscape Characteristics on Thermal Environment of Residential Streets in Warm-Humid Colombo
Street vegetation greatly affects the thermal comfort of pedestrians, thus creating habitable urban street landscapes. Nevertheless, the unplanned developments along streets have been a course of thermal discomfort at the pedestrian level. Therefore, the morphology of streets should be carefully considered when trees are introduced to improve outdoor thermal comfort (OTC). This research aims to assess the effects of street characteristics on the thermal comfort of residential streets in two selected local climate zones (LCZ) in Colombo. The research was conducted in five stages; (1) onsite measurements, (2) modelling the study area, (3) mapping the microclimatic and thermal comfort conditions, (4) comparing the results temporally and spatially and (5) developing recommendations. The climate parameters measured onsite were used for simulations in ENVI-met 5.0.3 Bio-met software to analyse the physiologically equivalent temperature (PET) at 1.5 m above ground level on a sunny day at 2.00 pm. Results revealed that comparatively lower Air temperature, relative humidity and higher wind speed improve OTC levels in warm-humid residential streets. Further, morning thermal discomfort conditions have resulted due to either releasing release of the stored heat in the building or high RH values and low wind speed. Streets located completely in compact low-rise LCZ thermally cause more discomfort than streets completely or partially in open low-rise LCZ. Vegetation is the most effective way to improve OTC, especially using large trees with grass. Homogenous shade coverage consistently distributes thermal comfort. However, irrespective of the street axis orientation, shade coverage is more important in terms of enhancing OTC. Planting large trees in residential land plots along narrow streets and medium trees in centre-median on wider roads is highly recommended. ENVI-met shows a strong correlation between measured and simulated Ta, yet, it is recommended to have nesting grids for more accurate results. These findings help professionals in climate-responsive policymaking for urban residential streets since local climate change is in urgent need.
The Role of Landscape Characteristics on Thermal Environment of Residential Streets in Warm-Humid Colombo
Lecture Notes in Civil Engineering
Dissanayake, Ranjith (editor) / Mendis, Priyan (editor) / Weerasekera, Kolita (editor) / De Silva, Sudhira (editor) / Fernando, Shiromal (editor) / Konthesingha, Chaminda (editor) / Gajanayake, Pradeep (editor) / Dissanayake, C. (author) / Weerasinghe, U. G. D. (author)
International Conference on Sustainable Built Environment ; 2022 ; Yogyakarta, Indonesia
2023-08-10
16 pages
Article/Chapter (Book)
Electronic Resource
English
Energy-Efficient Urban Design Guidelines for Warm-Humid Cities: Strategies for Colombo, Sri Lanka
| British Library Online Contents | 1995
ENERGY-EFFICIENT URBAN DESIGN GUIDELINES FOR WARM-HUMID CITIES: STRATEGIES FOR COLOMBO, SRI LANKA
| Online Contents | 1995
| British Library Online Contents | 2005
| TIBKAT | 1990