Effects Of Road Geometry And Roadside Trees On Urban Road Thermal Performance In Penang
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Date
2016-06
Authors
Mirzaei, Nasibeh Faghih
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Abstract
This research investigates the effects of the physical road characteristics and
roadside tree features on the road thermal performance in Penang, Malaysia; located
in tropical region where there is high solar radiation intensity. The variables of urban
road features studied include road width and road orientation. Accordingly, the
effects of physical properties of roadside tree takes to accounts, including tree
position, tree height, canopy density and tree distance from the road edges. The
research methodology is quantitative in nature via fieldwork measurements to assess
the road thermal performance. The study measures road surface temperature and air
temperature above road surface in accordance with research objectives and
hypotheses. The research findings illustrated the significant effects of road and tree
characteristics on road surface temperature and air temperature. Based on road
orientation and width, North West-South East wide roads had the highest average
surface temperatures. However, North-South oriented narrow roads provide a better
urban road microclimate. Moreover, tall trees with dense canopy had the most
significant effect on road surface temperature reduction by providing high quality
shade. The results also revealed remarkable differences of road thermal performance
between road with trees and without trees. Finally, the conclusion from the potential
cooling effects of roadside trees and road characteristics on the road thermal
performance can be implemented as a guideline of urban road design in modification
road microclimate in urban tropical region.
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Keywords
The effects of the physical road characteristics and roadside tree features , on the road thermal performance in Penang,